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Stock Plans - Schedule of Stock Compensation Expense (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Restricted stock | $ 4,026 us-gaap_RestrictedStockExpense | $ 4,129 us-gaap_RestrictedStockExpense | $ 4,744 us-gaap_RestrictedStockExpense
Stock options | 2,355 us-gaap_StockOptionPlanExpense | 2,825 us-gaap_StockOptionPlanExpense | 2,435 us-gaap_StockOptionPlanExpense
Performance stock | 2,672 msa_PerformanceStockExpense | 3,383 msa_PerformanceStockExpense | 2,831 msa_PerformanceStockExpense
Total compensation expense before income taxes | 9,053 us-gaap_ShareBasedCompensation | 10,337 us-gaap_ShareBasedCompensation | 10,010 us-gaap_ShareBasedCompensation
Income tax benefit | 3,293 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | 3,810 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | 3,700 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Total compensation expense, net of income tax benefit | $ 5,760 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax | $ 6,527 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax | $ 6,310 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax

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- Definition Performance stock expense. + References No definition available. + Details
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- Definition The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References No definition available. + Details
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- Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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