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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2013	Apr. 15, 2013
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q1
Trading Symbol	MSA
Entity Registrant Name	MINE SAFETY APPLIANCES CO
Entity Central Index Key	0000066570
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		37,141,855

Condensed Consolidated Statement of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net sales	$ 283,239	$ 293,485
Other (expense) income, net	(120)	5
Revenues, Total	283,119	293,490
Costs and expenses
Cost of products sold	158,457	166,494
Selling, general and administrative	83,587	77,063
Research and development	10,584	9,292
Interest expense	2,660	3,149
Currency exchange losses, net	1,119	2,420
Costs and Expenses, Total	256,407	258,418
Income before income taxes	26,712	35,072
Provision for income taxes	7,317	10,750
Net income	19,395	24,322
Net income attributable to noncontrolling interests	(109)	(400)
Net income attributable to Mine Safety Appliances Company	$ 19,286	$ 23,922
Earnings per share attributable to Mine Safety Appliances Company common shareholders
Basic	$ 0.52	$ 0.65
Diluted	0.51	0.64
Dividends per common share	$ 0.28	$ 0.26

Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net income	$ 19,395	$ 24,322
Foreign currency translation adjustments	(5,588)	9,364
Pension and post-retirement plan adjustments, net of tax	2,107
Comprehensive income	15,914	33,686
Comprehensive loss (income) attributable to noncontrolling interests	439	(766)
Comprehensive income attributable to Mine Safety Appliances Company	$ 16,353	$ 32,920

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

Amount after tax, before reclassification adjustments, resulting from the process of expressing in the reporting currency of the reporting entity those amounts that are denominated or measured in a different currency, and from transactions whose terms are denominated in a currency other than the entity's functional currency.

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+ Details

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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+ Details

Condensed Consolidated Balance Sheet - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 76,793	$ 82,718
Trade receivables, less allowance for doubtful accounts of $7,568 and $7,402	206,954	191,289
Inventories	135,614	136,300
Deferred tax assets	16,408	17,727
Income taxes receivable	7,715	6,342
Prepaid expenses and other current assets	25,647	29,172
Total current assets	469,131	463,548
Property, less accumulated depreciation of $315,145 and $310,279	146,296	147,465
Prepaid pension cost	44,495	42,818
Deferred tax assets	16,109	17,018
Goodwill	256,726	258,400
Other noncurrent assets	200,905	182,497
Total assets	1,133,662	1,111,746
Current liabilities
Notes payable and current portion of long-term debt	7,986	6,823
Accounts payable	66,311	59,519
Employees' compensation	36,278	41,602
Insurance and product liability	32,312	15,025
Taxes on income	3,657	4,389
Other current liabilities	50,646	61,442
Total current liabilities	197,190	188,800
Long-term debt	278,333	272,333
Pensions and other employee benefits	149,307	151,536
Deferred tax liabilities	17,094	17,249
Other noncurrent liabilities	11,018	11,124
Total liabilities	652,942	641,042
Commitments and contingencies (Note 15)
Mine Safety Appliances Company shareholders' equity:
Preferred stock, 4 1/2% cumulative-authorized 100,000 shares of $50 par value; issued 71,373 and 71,373 shares, callable at $52.50 per share	3,569	3,569
Second cumulative preferred voting stock-authorized 1,000,000 shares of $10 par value; none issued
Common stock, no par value, issued 62,081,391 and 62,081,391 shares, outstanding 37,140,521 and 37,007,799 shares	119,738	112,135
Stock compensation trust-523,516 and 745,430 shares	(2,733)	(3,891)
Treasury shares, at cost, preferred-52,878 and 52,878 shares, common-24,417,354 and 24,328,162 shares	(273,772)	(269,739)
Accumulated other comprehensive loss	(130,005)	(127,072)
Retained earnings	756,867	747,953
Total Mine Safety Appliances Company shareholders' equity	473,664	462,955
Noncontrolling interests	7,056	7,749
Total shareholders' equity	480,720	470,704
Total liabilities and shareholders' equity	$ 1,133,662	$ 1,111,746

Condensed Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Trade receivables, allowance for doubtful accounts	$ 7,568	$ 7,402
Property, accumulated depreciation	$ 315,145	$ 310,279
Common stock, par value	$ 0	$ 0
Common stock, shares issued	62,081,391	62,081,391
Common stock, shares outstanding	37,140,521	37,007,799
Stock compensation trust, shares	523,516	745,430
Treasury shares, at cost, preferred	52,878	52,878
Treasury shares, at cost, common	24,417,354	24,328,162
Preferred Stock, 4 1/2% Cumulative
Percentage of cumulative preferred stock	4.50%	4.50%
Preferred stock, shares authorized	100,000	100,000
Preferred stock, par value	$ 50	$ 50
Preferred stock, shares issued	71,373	71,373
Preferred stock, callable per share	$ 52.50	$ 52.50
Second Cumulative Preferred Voting Stock
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, par value	$ 10	$ 10
Preferred stock, shares issued	0	0

Condensed Consolidated Statement of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating Activities
Net income	$ 19,395	$ 24,322
Depreciation and amortization	7,845	7,986
Pensions	2,880	675
Net loss from investing activities-disposal of assets	32	39
Stock-based compensation	5,195	2,918
Deferred income tax provision	24	531
Other noncurrent assets and liabilities	(20,870)	(2,307)
Currency exchange losses, net	1,119	2,420
Excess tax benefit related to stock plans	(650)	(1,136)
Other, net	(1,061)	(1,146)
Operating cash flow before changes in certain working capital items	13,909	34,302
Trade receivables	(17,895)	(14,719)
Inventories	(1,873)	(5,492)
Accounts payable and accrued liabilities	10,061	12,805
Income taxes receivable, prepaid expenses and other current assets	1,854	6,536
Increase in certain working capital items	(7,853)	(870)
Cash flow from operating activities	6,056	33,432
Investing Activities
Capital expenditures	(7,452)	(8,044)
Property disposals and other investing	47	95
Cash flow from investing activities	(7,405)	(7,949)
Financing Activities
Proceeds from short-term debt, net	1,182	984
Proceeds from long-term debt	104,100	35,500
Payments on long-term debt	(98,100)	(57,500)
Cash dividends paid	(10,372)	(9,550)
Distributions to noncontrolling interests	(275)
Company stock purchases	(4,033)	(2,308)
Exercise of stock options	2,916	1,389
Excess tax benefit related to stock plans	650	1,136
Cash flow from financing activities	(3,932)	(30,349)
Effect of exchange rate changes on cash and cash equivalents	(644)	1,576
Decrease in cash and cash equivalents	(5,925)	(3,290)
Beginning cash and cash equivalents	82,718	59,938
Ending cash and cash equivalents	$ 76,793	$ 56,648

Basis of Presentation

3 Months Ended

Mar. 31, 2013

Basis of Presentation

(1) Basis of Presentation

We have prepared the condensed consolidated financial statements in accordance with accounting principles generally accepted in the United States of America (GAAP) for interim financial information and with the rules and regulations for reporting on Form 10-Q. Accordingly, they do not include certain information and disclosures required for comprehensive financial statements.

The year-end condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America. The other information in these financial statements is unaudited; however, we believe that all adjustments, consisting of only normal recurring adjustments, necessary for a fair presentation of these interim periods have been included. The results for interim periods are not necessarily indicative of the results to be expected for the full year.

The condensed consolidated financial statements include the accounts of the company and all subsidiaries. Intercompany accounts and transactions have been eliminated.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

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+ Details

Accumulated Other Comprehensive Loss

3 Months Ended

Mar. 31, 2013

Accumulated Other Comprehensive Loss

(2) Accumulated Other Comprehensive Loss

Components of accumulated other comprehensive loss are as follows:


(In thousands)	March 31, 2013			December 31, 2012
Cumulative translation adjustments	$	(81	)	$	4,959
Pension and post-retirement plan adjustments		(129,924	)		(132,031	)

Accumulated other comprehensive loss		(130,005	)		(127,072	)

Reclassifications Out of Accumulated Other Comprehensive Loss

3 Months Ended

Mar. 31, 2013

Reclassifications Out of Accumulated Other Comprehensive Loss

(3) Reclassifications Out of Accumulated Other Comprehensive Loss

Pension and post-retirement benefit plan items reclassified out of accumulated other comprehensive loss during the three months ended March 31, 2013 are as follows:


Amortization of prior service cost	$	(80	)
Recognized net actuarial losses		3,465

Total reclassifications		3,385
Tax benefit		1,278

Total reclassifications, net of tax		2,107

The reclassifications out of accumulated other comprehensive loss are included in the computation of net periodic pension and other post-retirement benefit costs (see Note 6—Pensions and Other Post-Retirement Benefits).

- Definition

The entire disclosure for any adjustments made during the period to avoid double counting in comprehensive income items displayed as part of net income that also had been displayed as part of other comprehensive income in that period or earlier periods. These adjustments include reclassifications to net income of items in accumulated comprehensive income, such as deferred gains or losses on qualifying hedges when hedged item reported in net income, holding gains or losses on available-for-sale securities transferred into trading category, unrealized holding gains or losses on debt securities transferred from held-to-maturity category into available-for-sale category and accumulated translation adjustment attributable to foreign subsidiary or investment in foreign entity upon sale or liquidation.

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+ Details

Earnings per Share

3 Months Ended

Mar. 31, 2013

Earnings per Share

(4) Earnings per Share

Basic earnings per share is computed by dividing net income, after the deduction of preferred stock dividends and undistributed earnings allocated to participating securities, by the weighted average number of common shares outstanding during the period. Diluted earnings per share assumes the issuance of common stock for all potentially dilutive share equivalents outstanding not classified as participating securities. Participating securities are defined as unvested stock-based payment awards that contain nonforfeitable rights to dividends.


	Three Months Ended March 31,
(In thousands, except per share amounts)	2013			2012
Net income attributable to Mine Safety Appliances Company	$	19,286		$	23,922
Preferred stock dividends		(10	)		(10	)

Income available to common equity		19,276			23,912
Dividends and undistributed earnings allocated to participating securities		(171	)		(261	)

Income available to Mine Safety Appliances Company common shareholders		19,105			23,651

Basic earnings per common share	$	0.52		$	0.65

Diluted earnings per common share	$	0.51		$	0.64

Basic shares outstanding		36,734			36,369
Stock options and other stock compensation		635			509

Diluted shares outstanding		37,369			36,878

Antidilutive stock options		173			924

Segment Information

3 Months Ended

Mar. 31, 2013

Segment Information

(5) Segment Information

We are organized into eleven geographic operating segments based on management responsibilities. The operating segments have been aggregated (based on economic similarities, the nature of their products, end-user markets and methods of distribution) into three reportable segments: North America, Europe, and International. Reportable segment information is presented in the following table:


(In thousands)	North America		Europe		International		Reconciling Items			Consolidated Totals
Three Months Ended March 31, 2013
Sales to external customers	$	136,115	$	70,999	$	76,125	$	—		$	283,239
Intercompany sales		28,825		25,236		4,609		(58,670	)		—
Net income (loss) attributable to Mine Safety Appliances Company		16,155		3,629		6,669		(7,167	)		19,286
Three Months Ended March 31, 2012
Sales to external customers	$	137,484	$	72,466	$	83,535	$	—		$	293,485
Intercompany sales		26,618		24,909		4,546		(56,073	)		—
Net income (loss) attributable to Mine Safety Appliances Company		16,257		5,621		8,265		(6,221	)		23,922

Reconciling items consist primarily of intercompany eliminations and items reported at the corporate level.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

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-Name Accounting Standards Codification
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
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+ Details

Pensions and Other Post-Retirement Benefits

3 Months Ended

Mar. 31, 2013

Pensions and Other Post-Retirement Benefits

(6) Pensions and Other Post-Retirement Benefits

Components of net periodic benefit cost consisted of the following:


	Pension Benefits						Other Benefits
(In thousands)	2013			2012			2013			2012
Three months ended March 31
Service cost	$	2,784		$	2,436		$	172		$	174
Interest cost		4,468			4,789			262			316
Expected return on plan assets		(7,725	)		(8,101	)		—			—
Amortization of prior service cost		26			77			(106	)		(114	)
Recognized net actuarial losses		3,327			1,474			138			132

Net periodic benefit cost		2,880			675			466			508

We made contributions of $1.1 million to our pension plans during the three months ended March 31, 2013. We expect to make total contributions of approximately $4.5 million to our pension plans in 2013.

- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

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-Name Implementation Guide (Q and A)
-Number FAS88
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Goodwill and Intangible Assets

3 Months Ended

Mar. 31, 2013

Goodwill and Intangible Assets

(7) Goodwill and Intangible Assets

Changes in goodwill during the three months ended March 31, 2013 were as follows:


(In thousands)	Goodwill
Net balance at January 1	$	258,400
Currency translation		(1,674	)

Net balance at March 31		256,726

At March 31, 2013, goodwill of $196.5 million, $57.7 million, and $2.5 million related to the North American, European, and International reporting units, respectively.

Changes in intangible assets, net of accumulated amortization (reported in other noncurrent assets) during the three months ended March 31, 2013 were as follows:


(In thousands)	Intangible Assets
Net balance at January 1	$	38,648
Amortization expense		(945	)
Currency translation		(166	)

Net balance at March 31		37,537

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Inventories

3 Months Ended

Mar. 31, 2013

Inventories

(8) Inventories


(In thousands)	March 31, 2013		December 31, 2012
Finished products	$	74,502	$	72,658
Work in process		12,728		13,473
Raw materials and supplies		48,384		50,169

Total inventories		135,614		136,300

Stock Plans

3 Months Ended

Mar. 31, 2013

Stock Plans

(9) Stock Plans

The 2008 Management Equity Incentive Plan provides for various forms of stock-based compensation for eligible employees through May 2018. Management stock-based compensation includes stock options, restricted stock, and performance stock units. The 2008 Non-Employee Directors’ Equity Incentive Plan provides for grants of stock options and restricted stock to non-employee directors through May 2018. Stock options are granted at market value option prices and expire after ten years. Stock options are exercisable beginning three years after the grant date. Stock options are valued at an estimated fair value using the Black Scholes option pricing model. Restricted stock is granted without payment to the company and generally vests three years after the grant date. Certain restricted stock for management retention vests in three equal tranches four, five, and six years after the grant date. Unvested restricted stock for management retention is forfeited if the grantee’s employment with the company terminates for any reason other than death or disability. Restricted stock is valued at the market value of the stock on the grant date. Performance stock units with a performance condition are valued at the market value of the stock on the grant date. Performance stock units with a market condition are valued at an estimated fair value using a Monte Carlo model. The final number of shares to be issued for performance stock units may range from zero to 200% of the target award based on achieving a targeted return on net assets, total shareholder return or other specific performance condition over the performance period. We issue Stock Compensation Trust shares or new shares for stock option exercises, restricted stock grants, and performance stock unit grants.

Stock compensation expense was as follows:


	Three Months Ended March 31,
(In thousands)	2013		2012
Stock compensation expense	$	5,195	$	2,918
Income tax benefit		1,922		1,048

Stock compensation expense, net of income tax benefit		3,273		1,870

A summary of stock option activity for the three months ended March 31, 2013 follows:


	Shares			Weighted Average Exercise Price
Outstanding at January 1		1,784,660		$	33.05
Granted		173,154			48.95
Exercised		(85,263	)		34.20

Outstanding at March 31		1,872,551			34.46

Exercisable at March 31		1,313,051			32.29

A summary of restricted stock activity for the three months ended March 31, 2013 follows:


	Shares			Weighted Average Grant Date Fair Value
Unvested at January 1		417,843		$	31.92
Granted		63,508			48.89
Vested		(134,042	)		24.77
Forfeited		(6,938	)		40.02

Unvested at March 31		340,371			37.74

A summary of performance stock unit activity for the three months ended March 31, 2013 follows:


	Shares			Weighted Average Grant Date Fair Value
Unvested at January 1		137,672		$	35.85
Granted		53,357			57.58
Performance adjustments		3,317			24.63
Vested		(42,413	)		24.84

Unvested at March 31		151,933			46.31

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

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-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
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-Name Statement of Position (SOP)
-Number 93-6
-Paragraph 53
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+ Details

Derivative Financial Instruments

3 Months Ended

Mar. 31, 2013

Derivative Financial Instruments

(10) Derivative Financial Instruments

As part of our currency exchange rate risk management strategy, we enter into certain derivative foreign currency forward contracts that do not meet the GAAP criteria for hedge accounting, but which have the impact of partially offsetting certain foreign currency exposures. We account for these forward contracts on a full mark-to-market basis and report the related gains or losses in currency exchange gains or losses. At March 31, 2013, the notional amount of open forward contracts was $46.7 million and the unrealized loss on these contracts was $0.7 million.

The following table presents the balance sheet location and fair value of assets and liabilities associated with derivative financial instruments:


(In thousands)	March 31, 2012		December 31, 2012
Derivatives not designated as hedging instruments
Foreign exchange contracts:
Prepaid expenses and other current assets	$	—	$	801
Other current liabilities		713		—

The following table presents the income statement location and impact of derivative financial instruments:


		Loss (Gain) Recognized in Income
		Three Months Ended March 31,
(In thousands)	Income Statement Location	2013		2012
Derivatives not designated as hedging instruments
Foreign exchange contracts	Currency exchange losses, net	$	1,257	$	92

- Definition

The entire disclosure for the entity's entire derivative instruments and hedging activities. Describes an entity's risk management strategies, derivatives in hedging activities and non-hedging derivative instruments, the assets, obligations, liabilities, revenues and expenses arising therefrom, and the amounts of and methodologies and assumptions used in determining the amounts of such items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(n))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 21: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Income Taxes

3 Months Ended

Mar. 31, 2013

Income Taxes

(11) Income Taxes

At March 31, 2013, we had a gross liability for unrecognized tax benefits of $9.5 million. We have recognized tax benefits associated with these liabilities of $8.6 million at March 31, 2013. These balances are unchanged since December 31, 2012. We do not expect that the total amount of the unrecognized tax benefits will significantly increase or decrease within twelve months of the reporting date.

We recognize interest related to unrecognized tax benefits in interest expense and penalties in operating expenses. Our liability for accrued interest and penalties related to uncertain tax positions was $0.7 million at March 31, 2013.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
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-Name Accounting Standards Codification
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 136, 172
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 43, 44, 45, 46, 47, 48, 49
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Fair Value Measurements

3 Months Ended

Mar. 31, 2013

Fair Value Measurements

(12) Fair Value Measurements

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The fair value hierarchy consists of three broad levels, which gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). The three levels of the fair value hierarchy are:

•

Level 1—Observable inputs that reflect unadjusted quoted prices for identical assets or liabilities in active markets.

•

Level 2—Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly.

•

Level 3—Unobservable inputs for the asset or liability.

The valuation methodologies we used to measure financial assets and liabilities were limited to the derivative financial instruments described in Note 10. We estimate the fair value of the derivative financial instruments, consisting of foreign currency forward contracts, based upon valuation models with inputs that generally can be verified by observable market conditions and do not involve significant management judgment. Accordingly, the fair values of the derivative financial instruments are classified within Level 2 of the fair value hierarchy.

- Definition

The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 3
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 6
-Footnote 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 33
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Fair Value of Financial Instruments

3 Months Ended

Mar. 31, 2013

Fair Value of Financial Instruments

(13) Fair Value of Financial Instruments

With the exception of fixed rate long-term debt, we believe that the reported carrying amounts of our financial assets and liabilities approximate their fair values. At March 31, 2013, the reported carrying amount of our fixed rate long-term debt was $160.0 million and the fair value was $170.4 million. The fair value of our long-term debt was determined using cash flow valuation models to estimate the market value of similar transactions as of March 31, 2013.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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-Name Accounting Standards Codification
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15B
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44A, 44B
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 17-22, 27, 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 3, 10, 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Assets Held for Sale

3 Months Ended

Mar. 31, 2013

Assets Held for Sale

(14) Assets Held for Sale

Certain assets related to detector tube manufacturing are classified as held for sale at March 31, 2013. These assets are reported in the following balance sheet lines:


(In millions)	March 31, 2013
Inventory	$	1.4
Property, net of depreciation		0.3

Total assets		1.7

The potential impact of the sale of detector tube assets is not expected to be material to net income or earnings per share.

Our $3.5 million equity investment in a joint venture company is classified as held for sale at March 31, 2013 and reported in other current assets. The potential impact of the sale of this investment is not expected to be material to net income or earnings per share.

Contingencies

3 Months Ended

Mar. 31, 2013

Contingencies

(15) Contingencies

We categorize the product liability losses that we experience into two main categories, single incident and cumulative trauma. Single incident product liability claims are discrete incidents that are typically known to us when they occur and involve observable injuries and, therefore, more quantifiable damages. Therefore, we maintain a reserve for single incident product liability claims based on expected settlement costs for pending claims and an estimate of costs for unreported claims derived from experience, sales volumes and other relevant information. Our reserve for single incident product liability claims was $4.7 million at March 31, 2013 and $4.4 million at December 31, 2012. Single incident product liability expense during the three months ended March 31, 2013 and 2012 was $0.3 million and $0.3 million, respectively. We evaluate our single incident product liability exposures on an ongoing basis and make adjustments to the reserve as new information becomes available.

Cumulative trauma product liability claims involve exposures to harmful substances (e.g., silica, asbestos and coal dust) that occurred many years ago and may have developed over long periods of time into diseases such as silicosis, asbestosis or coal worker’s pneumoconiosis. We are presently named as a defendant in 2,658 lawsuits in which plaintiffs allege to have contracted certain cumulative trauma diseases related to exposure to silica, asbestos, and/or coal dust. These lawsuits mainly involve respiratory protection products allegedly manufactured and sold by us. We are unable to estimate total damages sought in these lawsuits as they generally do not specify the injuries alleged or the amount of damages sought, and potentially involve multiple defendants.

Cumulative trauma product liability litigation is difficult to predict. In our experience, until late in a lawsuit, we cannot reasonably determine whether it is probable that any given cumulative trauma lawsuit will ultimately result in a liability. This uncertainty is caused by many factors, including the following: cumulative trauma complaints generally do not provide information sufficient to determine if a loss is probable; cumulative trauma litigation is inherently unpredictable and information is often insufficient to determine if a lawsuit will develop into an actively litigated case; and even when a case is actively litigated, it is often difficult to determine if the lawsuit will be dismissed or otherwise resolved until late in the lawsuit. Moreover, even once it is probable that such a lawsuit will result in a loss, it is difficult to reasonably estimate the amount of actual loss that will be incurred. These amounts are highly variable and turn on a case-by-case analysis of the relevant facts, which are often not learned until late in the lawsuit.

Because of these factors, we cannot reliably determine our potential liability for such claims until late in the lawsuit. We, therefore, do not record cumulative trauma product liability losses when a lawsuit is filed, but rather, when we learn sufficient information to determine that it is probable that we will incur a loss and the amount of loss can be reasonably estimated. We record expenses for defense costs associated with open cumulative trauma product liability lawsuits as incurred.

We cannot estimate any amount or range of possible losses related to resolving pending and future cumulative trauma product liability claims that we may face because of the factors described above. As new information about cumulative trauma product liability cases and future developments becomes available, we reassess our potential exposures.

A summary of cumulative trauma product liability claims activity follows:


	Three Months Ended March 31, 2013			Year Ended December 31, 2012
Open claims, beginning of period		2,609			2,321
New claims		134			750
Settled and dismissed claims		(85	)		(462	)

Open claims, end of period		2,658			2,609

With some common contract exclusions, we maintain insurance for cumulative trauma product liability claims. We have purchased insurance policies from over 20 different insurance carriers that provide coverage for cumulative trauma product liability losses and related defense costs. In the normal course of business, we make payments to settle product liability claims and for related defense costs. We record receivables for the amounts that are covered by insurance. The available limits of these policies are many times our recorded insurance receivable balance.

Various factors could affect the timing and amount of recovery of our insurance receivables, including the outcome of negotiations with insurers, legal proceedings with respect to product liability insurance coverage and the extent to which insurers may become insolvent in the future.

Our insurance receivables at March 31, 2013 totaled $150.1 million, of which $2.0 million is reported in other current assets and $148.1 million in other non-current assets. Our insurance receivables at December 31, 2012 totaled $130.0 million.

A summary of insurance receivable balances and activity related to cumulative trauma product liability losses follows:


(In millions)	Three Months Ended March 31, 2013		Year Ended December 31, 2012
Balance beginning of period	$	130.0	$	112.1
Additions		20.1		29.7
Collections and settlements		—		(11.8	)

Balance end of period		150.1		130.0

Additions to insurance receivables in the above table represent insured cumulative trauma product liability losses and related defense costs. Uninsured cumulative trauma product liability losses were $0.2 million during the three months ended March 31, 2013. There were no uninsured cumulative trauma product liability losses during the three months ended March 31, 2012.

Our aggregate cumulative trauma product liability losses and administrative and defense costs for the three years ended December 31, 2012, totaled approximately $99.7 million, substantially all of which was insured.

We believe that the increase in the insurance receivable balance that we have experienced since 2005 is primarily due to disagreements among our insurance carriers, and consequently with us, as to when their individual obligations to pay us are triggered and the amount of each insurer’s obligation, as compared to other insurers. We believe that our insurers do not contest that they have issued policies to us or that these policies cover cumulative trauma product liability claims. We believe that our ability to successfully resolve our insurance litigation with various insurance carriers in recent years demonstrates that we have strong legal positions concerning our rights to coverage.

We regularly evaluate the collectability of the insurance receivables and record the amounts that we conclude are probable of collection. Our conclusions are based on our analysis of the terms of the underlying insurance policies, our experience in successfully recovering cumulative trauma product liability claims from our insurers under other policies, the financial ability of our insurance carriers to pay the claims, our understanding and interpretation of the relevant facts and applicable law and the advice of legal counsel, who believe that our insurers are required to provide coverage based on the terms of the policies.

Although the outcome of cumulative trauma product liability matters cannot be predicted with certainty and unfavorable resolutions could materially affect our results of operations on a quarter-to-quarter basis, based on information currently available and the amounts of insurance coverage available to us, we believe that the disposition of cumulative trauma product liability lawsuits that are pending against us will not have a materially adverse effect on our future results of operations, financial condition, or liquidity.

We are currently involved in insurance coverage litigations with various of our insurance carriers.

In 2009, we sued The North River Insurance Company (North River) in the United States District Court for the Western District of Pennsylvania, alleging that North River breached one of its insurance policies by failing to pay amounts owed to us and that it engaged in bad-faith claims handling. We believe that North River’s refusal to indemnify us under the policy for product liability losses and legal fees paid by us is wholly contrary to Pennsylvania law and we are vigorously pursuing the legal actions necessary to collect all due amounts. Discovery has concluded and motions for summary judgment on certain issues have been submitted to the court. A trial date has not yet been scheduled.

In 2010, North River sued us in the Court of Common Pleas of Allegheny County, Pennsylvania seeking a declaratory judgment concerning their responsibilities under three additional policies shared with Allstate Insurance Company (as successor in interest to policies issued by the Northbrook Excess and Surplus Insurance Company). We asserted claims against North River and Allstate for breaches of contract for failures to pay amounts owed to us. We also alleged that North River engaged in bad-faith claims handling. We believe that North River’s and Allstate’s refusals to indemnify us under these policies for product liability losses and legal fees paid by us is wholly contrary to Pennsylvania law and we are vigorously pursuing the legal actions necessary to collect all due amounts. Discovery has concluded and motions for summary judgment on certain issues have been submitted to the court. A trial date has not yet been scheduled.

In July 2010, we filed a lawsuit in the Superior Court of the State of Delaware seeking declaratory and other relief from the majority of our excess insurance carriers concerning the future rights and obligations of MSA and our excess insurance carriers under various insurance policies. The reason for this insurance coverage action is to secure a comprehensive resolution of our rights under the insurance policies issued by our insurers. The case is currently in discovery. We have resolved our claims against certain of our insurance carriers on some of their policies through negotiated settlements. When a settlement is reached, we dismiss the settling carrier from this action in Delaware.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Recently Adopted and Recently Issued Accounting Standards

3 Months Ended

Mar. 31, 2013

Recently Adopted and Recently Issued Accounting Standards

(16) Recently Adopted and Recently Issued Accounting Standards

In February 2013, the FASB issued ASU 2013-02, Comprehensive Income-Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. This ASU requires additional information about the amounts reclassified out of accumulated other comprehensive income by component. The adoption of this ASU on January 1, 2013 did not have a material effect on our consolidated financial statements.

Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 2013

Components of Accumulated Other Comprehensive Loss

Components of accumulated other comprehensive loss are as follows:


(In thousands)	March 31, 2013			December 31, 2012
Cumulative translation adjustments	$	(81	)	$	4,959
Pension and post-retirement plan adjustments		(129,924	)		(132,031	)

Accumulated other comprehensive loss		(130,005	)		(127,072	)

Reclassifications Out of Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 2013

Reclassification of Pension and Post-retirement Benefit Plan Out of Accumulated Other Comprehensive Loss

Pension and post-retirement benefit plan items reclassified out of accumulated other comprehensive loss during the three months ended March 31, 2013 are as follows:


Amortization of prior service cost	$	(80	)
Recognized net actuarial losses		3,465

Total reclassifications		3,385
Tax benefit		1,278

Total reclassifications, net of tax		2,107

Earnings per Share (Tables)

3 Months Ended

Mar. 31, 2013

Schedule of Earnings Per Share


	Three Months Ended March 31,
(In thousands, except per share amounts)	2013			2012
Net income attributable to Mine Safety Appliances Company	$	19,286		$	23,922
Preferred stock dividends		(10	)		(10	)

Income available to common equity		19,276			23,912
Dividends and undistributed earnings allocated to participating securities		(171	)		(261	)

Income available to Mine Safety Appliances Company common shareholders		19,105			23,651

Basic earnings per common share	$	0.52		$	0.65

Diluted earnings per common share	$	0.51		$	0.64

Basic shares outstanding		36,734			36,369
Stock options and other stock compensation		635			509

Diluted shares outstanding		37,369			36,878

Antidilutive stock options		173			924

Segment Information (Tables)

3 Months Ended

Mar. 31, 2013

Schedule of Reportable Segment Information

Reportable segment information is presented in the following table:


(In thousands)	North America		Europe		International		Reconciling Items			Consolidated Totals
Three Months Ended March 31, 2013
Sales to external customers	$	136,115	$	70,999	$	76,125	$	—		$	283,239
Intercompany sales		28,825		25,236		4,609		(58,670	)		—
Net income (loss) attributable to Mine Safety Appliances Company		16,155		3,629		6,669		(7,167	)		19,286
Three Months Ended March 31, 2012
Sales to external customers	$	137,484	$	72,466	$	83,535	$	—		$	293,485
Intercompany sales		26,618		24,909		4,546		(56,073	)		—
Net income (loss) attributable to Mine Safety Appliances Company		16,257		5,621		8,265		(6,221	)		23,922

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References + Details

Pensions and Other Post-Retirement Benefits (Tables)

3 Months Ended

Mar. 31, 2013

Components of Net Periodic Benefit Cost

Components of net periodic benefit cost consisted of the following:


	Pension Benefits						Other Benefits
(In thousands)	2013			2012			2013			2012
Three months ended March 31
Service cost	$	2,784		$	2,436		$	172		$	174
Interest cost		4,468			4,789			262			316
Expected return on plan assets		(7,725	)		(8,101	)		—			—
Amortization of prior service cost		26			77			(106	)		(114	)
Recognized net actuarial losses		3,327			1,474			138			132

Net periodic benefit cost		2,880			675			466			508

Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2013

Changes in Goodwill

Changes in goodwill during the three months ended March 31, 2013 were as follows:


(In thousands)	Goodwill
Net balance at January 1	$	258,400
Currency translation		(1,674	)

Net balance at March 31		256,726

Changes in Intangible Assets, Net of Accumulated Amortization

Changes in intangible assets, net of accumulated amortization (reported in other noncurrent assets) during the three months ended March 31, 2013 were as follows:


(In thousands)	Intangible Assets
Net balance at January 1	$	38,648
Amortization expense		(945	)
Currency translation		(166	)

Net balance at March 31		37,537

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References + Details

Inventories (Tables)

3 Months Ended

Mar. 31, 2013

Schedule of Inventories


(In thousands)	March 31, 2013		December 31, 2012
Finished products	$	74,502	$	72,658
Work in process		12,728		13,473
Raw materials and supplies		48,384		50,169

Total inventories		135,614		136,300

Stock Plans (Tables)

3 Months Ended

Mar. 31, 2013

Schedule of Stock Compensation Expense

Stock compensation expense was as follows:


	Three Months Ended March 31,
(In thousands)	2013		2012
Stock compensation expense	$	5,195	$	2,918
Income tax benefit		1,922		1,048

Stock compensation expense, net of income tax benefit		3,273		1,870

Summary of Stock Option Activity

A summary of stock option activity for the three months ended March 31, 2013 follows:


	Shares			Weighted Average Exercise Price
Outstanding at January 1		1,784,660		$	33.05
Granted		173,154			48.95
Exercised		(85,263	)		34.20

Outstanding at March 31		1,872,551			34.46

Exercisable at March 31		1,313,051			32.29

Summary of Restricted Stock Activity

A summary of restricted stock activity for the three months ended March 31, 2013 follows:


	Shares			Weighted Average Grant Date Fair Value
Unvested at January 1		417,843		$	31.92
Granted		63,508			48.89
Vested		(134,042	)		24.77
Forfeited		(6,938	)		40.02

Unvested at March 31		340,371			37.74

Summary of Performance Stock Unit Activity

A summary of performance stock unit activity for the three months ended March 31, 2013 follows:


	Shares			Weighted Average Grant Date Fair Value
Unvested at January 1		137,672		$	35.85
Granted		53,357			57.58
Performance adjustments		3,317			24.63
Vested		(42,413	)		24.84

Unvested at March 31		151,933			46.31

Derivative Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2013

Balance Sheet Location and Fair Value of Assets and Liabilities Associated with Derivative Financial Instruments

The following table presents the balance sheet location and fair value of assets and liabilities associated with derivative financial instruments:


(In thousands)	March 31, 2012		December 31, 2012
Derivatives not designated as hedging instruments
Foreign exchange contracts:
Prepaid expenses and other current assets	$	—	$	801
Other current liabilities		713		—

Income Statement Location and Impact of Derivative Financial Instruments

The following table presents the income statement location and impact of derivative financial instruments:


		Loss (Gain) Recognized in Income
		Three Months Ended March 31,
(In thousands)	Income Statement Location	2013		2012
Derivatives not designated as hedging instruments
Foreign exchange contracts	Currency exchange losses, net	$	1,257	$	92

- Definition

Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges.

+ References + Details

Assets Held for Sale (Tables)

3 Months Ended

Mar. 31, 2013

Schedule of Assets Held for Sale

These assets are reported in the following balance sheet lines:


(In millions)	March 31, 2013
Inventory	$	1.4
Property, net of depreciation		0.3

Total assets		1.7

Contingencies (Tables)

3 Months Ended

Mar. 31, 2013

Summary of Cumulative Trauma Product Liability Claims Activity

A summary of cumulative trauma product liability claims activity follows:


	Three Months Ended March 31, 2013			Year Ended December 31, 2012
Open claims, beginning of period		2,609			2,321
New claims		134			750
Settled and dismissed claims		(85	)		(462	)

Open claims, end of period		2,658			2,609

Summary of Insurance Receivable Balances and Activity Related to Cumulative Trauma Product Liability Losses

A summary of insurance receivable balances and activity related to cumulative trauma product liability losses follows:


(In millions)	Three Months Ended March 31, 2013		Year Ended December 31, 2012
Balance beginning of period	$	130.0	$	112.1
Additions		20.1		29.7
Collections and settlements		—		(11.8	)

Balance end of period		150.1		130.0

- Definition

Tabular disclosure of exposure to material amount of loss arising from allegations of damages pertaining to and arising from one or more of the entity's products.

+ References + Details

Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Loss [Abstract]
Cumulative translation adjustments	$ (81)	$ 4,959
Pension and post-retirement plan adjustments	(129,924)	(132,031)
Accumulated other comprehensive loss	$ (130,005)	$ (127,072)

- Definition

The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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+ Details

- Definition

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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+ Details

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Number 210
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-Article 3

+ Details

Reclassifiaction of Pension and Post-retirement Benefit Plan Out of Accumulated Other Comprehensive Loss (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2013 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of prior service cost	$ (80)
Recognized net actuarial losses	3,465
Total reclassifications	3,385
Tax benefit	1,278
Total reclassifications, net of tax	$ 2,107

- Definition

Before tax amount of the income statement impact of the reclassification adjustment for prior service costs recognized as a component of net period benefit cost.

+ References

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+ Details

Schedule of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Earnings per share attributable to Mine Safety Appliances Company common shareholders
Net income attributable to Mine Safety Appliances Company	$ 19,286	$ 23,922
Preferred stock dividends	(10)	(10)
Income available to common equity	19,276	23,912
Dividends and undistributed earnings allocated to participating securities	(171)	(261)
Income available to Mine Safety Appliances Company common shareholders	$ 19,105	$ 23,651
Basic earnings per common share	$ 0.52	$ 0.65
Diluted earnings per common share	$ 0.51	$ 0.64
Basic shares outstanding	36,734	36,369
Stock options and other stock compensation	635	509
Diluted shares outstanding	37,369	36,878
Antidilutive stock options	173	924

Segment Information - Additional Information (Detail)	3 Months Ended
Segment Information - Additional Information (Detail)	Mar. 31, 2013 Segment
Segment Reporting Information [Line Items]
Number of geographic operating segments	11
Number of reportable segments	3

Schedule of Reportable Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Sales to external customers	$ 283,239	$ 293,485
Net income (loss) attributable to Mine Safety Appliances Company	19,286	23,922
North America
Segment Reporting Information [Line Items]
Sales to external customers	136,115	137,484
Intercompany sales	28,825	26,618
Net income (loss) attributable to Mine Safety Appliances Company	16,155	16,257
Europe
Segment Reporting Information [Line Items]
Sales to external customers	70,999	72,466
Intercompany sales	25,236	24,909
Net income (loss) attributable to Mine Safety Appliances Company	3,629	5,621
International
Segment Reporting Information [Line Items]
Sales to external customers	76,125	83,535
Intercompany sales	4,609	4,546
Net income (loss) attributable to Mine Safety Appliances Company	6,669	8,265
Reconciling Items
Segment Reporting Information [Line Items]
Intercompany sales	(58,670)	(56,073)
Net income (loss) attributable to Mine Safety Appliances Company	$ (7,167)	$ (6,221)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 10, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A7
-Appendix A

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 87-21
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 19
-Article 5

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28, 29, 30
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 20
-Article 9

+ Details

Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,784	$ 2,436
Interest cost	4,468	4,789
Expected return on plan assets	(7,725)	(8,101)
Amortization of prior service cost	26	77
Recognized net actuarial losses	3,327	1,474
Net periodic benefit cost	2,880	675
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	172	174
Interest cost	262	316
Amortization of prior service cost	(106)	(114)
Recognized net actuarial losses	138	132
Net periodic benefit cost	$ 466	$ 508

- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Glossary Expected Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512136

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 60
-Glossary Expected Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512171

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(3)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References + Details

- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Service Cost (Component of Net Periodic Pension Cost)
-URI http://asc.fasb.org/extlink&oid=6525008

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph a, h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Pensions and Other Postretirement Benefits - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2013 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Pension plans contributions	$ 1.1
Total pension plans contributions for the period	$ 4.5

Changes in Goodwill (Detail) $ in Thousands	3 Months Ended
Changes in Goodwill (Detail) $ in Thousands	Mar. 31, 2013 USD ($)
Goodwill [Roll Forward]
Net balance at January 1	$ 258,400
Currency translation	(1,674)
Net balance at March 31	$ 256,726

- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 43
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 72
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-Clause 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph l
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 256,726	$ 258,400
North American
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	196,500
European
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	57,700
International
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 2,500

- Definition

+ References

+ Details

Changes in Intangible Assets, Net of Accumulated Amortization (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2013 USD ($)
Finite-Lived Intangible Assets, Net [Abstract]
Net balance at January 1	$ 38,648
Amortization expense	(945)
Currency translation	(166)
Net balance at March 31	$ 37,537

Schedule of Inventories (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Inventory, Net [Abstract]
Finished products	$ 74,502	$ 72,658
Work in process	12,728	13,473
Raw materials and supplies	48,384	50,169
Total inventories	$ 135,614	$ 136,300

Stock Plans - Additional Information (Detail)	3 Months Ended
Stock Plans - Additional Information (Detail)	Mar. 31, 2013 yr
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options expiration period	10 years
Stock options exercisable period after grant date	3 years
Number of tranches in which restricted stock is vested	3
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target award based on achieving targeted performance conditions	0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target award based on achieving targeted performance conditions	200.00%
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vest period	3 years
Tranche One \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vest period	4 years
Tranche Two \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vest period	5 years
Tranche Three \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vest period	6 years

Schedule of Stock Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Stock compensation expense	$ 5,195	$ 2,918
Income tax benefit	1,922	1,048
Stock compensation expense, net of income tax benefit	$ 3,273	$ 1,870

Summary of Stock Option Activity (Detail)	3 Months Ended
Summary of Stock Option Activity (Detail)	Mar. 31, 2013 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at January 1, Shares \| shares	1,784,660
Granted, Shares \| shares	173,154
Exercised, Shares \| shares	(85,263)
Outstanding at March 31, Shares \| shares	1,872,551
Exercisable at March 31, Shares \| shares	1,313,051
Outstanding at January 1, Weighted Average Exercise Price \| $ / shares	$ 33.05
Granted, Weighted Average Exercise Price \| $ / shares	48.95
Exercised, Weighted Average Exercise Price \| $ / shares	34.20
Outstanding at March 31, Weighted Average Exercise Price \| $ / shares	34.46
Exercisable at March 31, Weighted Average Exercise Price \| $ / shares	$ 32.29

Summary of Restricted Stock Activity (Detail) - Restricted Stock Activity	3 Months Ended
	Mar. 31, 2013 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested at January 1, Shares \| shares	417,843
Granted, Shares \| shares	63,508
Vested, Shares \| shares	(134,042)
Forfeited, Shares \| shares	(6,938)
Unvested at March 31, Shares \| shares	340,371
Unvested at January 1, Weighted Average Grant Date Fair Value \| $ / shares	$ 31.92
Granted, Weighted Average Grant Date Fair Value \| $ / shares	48.89
Vested, Weighted Average Grant Date Fair Value \| $ / shares	24.77
Forfeited, Weighted Average Grant Date Fair Value \| $ / shares	40.02
Unvested at March 31, Weighted Average Grant Date Fair Value \| $ / shares	$ 37.74

Summary of Performance Stock Unit Activity (Detail) - Performance Stock Unit Activity	3 Months Ended
	Mar. 31, 2013 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested at January 1, Shares \| shares	137,672
Granted, Shares \| shares	53,357
Performance adjustments, Shares \| shares	3,317
Vested, Shares \| shares	(42,413)
Unvested at March 31, Shares \| shares	151,933
Unvested at January 1, Weighted Average Grant Date Fair Value \| $ / shares	$ 35.85
Granted, Weighted Average Grant Date Fair Value \| $ / shares	57.58
Performance adjustments, Weighted Average Grant Date Fair Value \| $ / shares	24.63
Vested, Weighted Average Grant Date Fair Value \| $ / shares	24.84
Unvested at March 31, Weighted Average Grant Date Fair Value \| $ / shares	$ 46.31

Derivative Financial Instrument - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2013 USD ($)
Derivative [Line Items]
Notional amount of open forward contracts	$ 46.7
Unrealized loss on contract	$ 0.7

Balance Sheet Location and Fair Value of Assets and Liabilities Associated with Derivative Financial Instruments (Detail) - Foreign Exchange Contract - USD ($) $ in Thousands	Mar. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Prepaid expenses and other current assets		$ 801
Other current liabilities	$ 713

Income Statement Location and Impact of Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivatives Not Designated As Hedging Instruments \| Foreign Exchange Contract
Derivative Instruments, Gain (Loss) [Line Items]
Currency exchange losses, net	$ 1,257	$ 92

- Definition

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

+ References + Details

Income Taxes - Additional Information (Detail) $ in Millions	Mar. 31, 2013 USD ($)
Income Taxes [Line Items]
Unrecognized tax benefits	$ 9.5
Recognized tax benefits	8.6
Accrued interest and penalties related to uncertain tax positions	$ 0.7

Fair Value of Financial Instruments - Additional Information (Detail) $ in Millions	Mar. 31, 2013 USD ($)
Carrying Amounts and Fair Values of Financial Instruments or Liabilities [Line Items]
Carrying amount of fixed rate long-term debt	$ 160.0
Fair value of long-term debt	$ 170.4

Schedule of Assets Held for Sale (Detail) $ in Millions	Mar. 31, 2013 USD ($)
Assets Held For Sale [Abstract]
Inventory	$ 1.4
Property, net of depreciation	0.3
Total assets	$ 1.7

Assets Held for Sale - Additional Information (Detail) $ in Millions	Mar. 31, 2013 USD ($)
Other Current Assets
Long Lived Assets Held-for-sale [Line Items]
Investment held for sale	$ 3.5

- Definition

Equity securities categorized neither as held-to-maturity nor trading which are intended be sold within one year from the balance sheet date or the normal operating cycle, whichever is longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 16
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Section A
-Paragraph 4, 5
-Chapter 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 3
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13, 17
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended		48 Months Ended
	Mar. 31, 2013 USD ($) LegalMatter Vendor	Mar. 31, 2012 USD ($)	Dec. 31, 2012 USD ($) LegalMatter	Dec. 31, 2011 USD ($) LegalMatter
Loss Contingencies [Line Items]
Number of lawsuits \| LegalMatter	2,658		2,609	2,321
Number of insurance carriers \| Vendor	20
Insurance receivables	$ 150.1		$ 130.0	$ 112.1
Insurance receivables, current	2.0
Insurance receivables, noncurrent	148.1
Cumulative Trauma
Loss Contingencies [Line Items]
Product liability expense			99.7
Single Incident
Loss Contingencies [Line Items]
Reserves for product liability claims	4.7		$ 4.4
Product liability expense	0.3	$ 0.3
Uninsured Cumulative Trauma
Loss Contingencies [Line Items]
Product liability expense	$ 0.2	$ 0.0

Summary of Cumulative Trauma Product Liability Claims Activity (Detail) - LegalMatter	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Open claims, beginning of period	2,609	2,321
New claims	134	750
Settled and dismissed claims	(85)	(462)
Open claims, end of period	2,658	2,609

Summary of Insurance Receivable Balances and Activity Related to Cumulative Trauma Product Liability Losses (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Balance beginning of period	$ 130.0	$ 112.1
Additions	20.1	29.7
Collections and settlements		(11.8)
Balance end of period	$ 150.1	$ 130.0