Income Taxes - Schedule of Provision for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Current:
Federal	$ 7,316us-gaap_CurrentFederalTaxExpenseBenefit	$ 4,994us-gaap_CurrentFederalTaxExpenseBenefit
State and local	1,478	1,186
Foreign	520us-gaap_CurrentForeignTaxExpenseBenefit	(267)us-gaap_CurrentForeignTaxExpenseBenefit
Total current provision	9,314us-gaap_CurrentIncomeTaxExpenseBenefit	5,913us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	3,840	3,331
State and local	624	511
Foreign	131	478
Total deferred provision	4,595	4,320
Provision for income taxes	$ 13,909us-gaap_IncomeTaxExpenseBenefit	$ 10,233us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of deferred income tax expense (benefit) and income tax credits.

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