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Income Taxes - Components of Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current
Federal	$ 4,718us-gaap_CurrentFederalTaxExpenseBenefit	$ 6,308us-gaap_CurrentFederalTaxExpenseBenefit	$ 9,663us-gaap_CurrentFederalTaxExpenseBenefit
Foreign	5,081us-gaap_CurrentForeignTaxExpenseBenefit	5,018us-gaap_CurrentForeignTaxExpenseBenefit	7,885us-gaap_CurrentForeignTaxExpenseBenefit
State and local	447us-gaap_CurrentStateAndLocalTaxExpenseBenefit	986us-gaap_CurrentStateAndLocalTaxExpenseBenefit	920us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current, Total	10,246us-gaap_CurrentIncomeTaxExpenseBenefit	12,312us-gaap_CurrentIncomeTaxExpenseBenefit	18,468us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred
Federal	(425)us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(1,081)us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(1,443)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Foreign	(1,110)us-gaap_DeferredForeignIncomeTaxExpenseBenefit	157us-gaap_DeferredForeignIncomeTaxExpenseBenefit	(1,310)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
State and local	(162)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	(181)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	(174)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred Total	(1,697)us-gaap_DeferredIncomeTaxExpenseBenefit	(1,105)us-gaap_DeferredIncomeTaxExpenseBenefit	(2,927)us-gaap_DeferredIncomeTaxExpenseBenefit
Income taxes	$ 8,549us-gaap_IncomeTaxExpenseBenefit	$ 11,207us-gaap_IncomeTaxExpenseBenefit	$ 15,541us-gaap_IncomeTaxExpenseBenefit

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