Income Taxes - Schedule of Provision for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ 31,700us-gaap_CurrentFederalTaxExpenseBenefit	$ 26,071us-gaap_CurrentFederalTaxExpenseBenefit	$ 14,402us-gaap_CurrentFederalTaxExpenseBenefit
State and local	6,505	5,958	2,287
Foreign	1,456us-gaap_CurrentForeignTaxExpenseBenefit	1,014us-gaap_CurrentForeignTaxExpenseBenefit	1,315us-gaap_CurrentForeignTaxExpenseBenefit
Total current provision	39,661us-gaap_CurrentIncomeTaxExpenseBenefit	33,043us-gaap_CurrentIncomeTaxExpenseBenefit	18,004us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	3,583	5,507	8,542
State and local	530	812	1,046
Foreign	(44)	(645)	(6)
Total deferred provision	4,069	5,674	9,582
Provision for income taxes	$ 43,730us-gaap_IncomeTaxExpenseBenefit	$ 38,717us-gaap_IncomeTaxExpenseBenefit	$ 27,586us-gaap_IncomeTaxExpenseBenefit

Amount of current federal 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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