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Summary 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	$ 5,939us-gaap_CurrentFederalTaxExpenseBenefit	$ 22,880us-gaap_CurrentFederalTaxExpenseBenefit	$ 30,375us-gaap_CurrentFederalTaxExpenseBenefit
State and local	445us-gaap_CurrentStateAndLocalTaxExpenseBenefit	3,817us-gaap_CurrentStateAndLocalTaxExpenseBenefit	4,331us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign	249us-gaap_CurrentForeignTaxExpenseBenefit	205us-gaap_CurrentForeignTaxExpenseBenefit	47us-gaap_CurrentForeignTaxExpenseBenefit
Current income tax expense, total	6,633us-gaap_CurrentIncomeTaxExpenseBenefit	26,902us-gaap_CurrentIncomeTaxExpenseBenefit	34,753us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred
Federal	23,600us-gaap_DeferredFederalIncomeTaxExpenseBenefit	15,920us-gaap_DeferredFederalIncomeTaxExpenseBenefit	7,865us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State and local	191us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	627us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	693us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign	(115)us-gaap_DeferredForeignIncomeTaxExpenseBenefit	(4)us-gaap_DeferredForeignIncomeTaxExpenseBenefit	(7)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Deferred income tax expense, total	23,676us-gaap_DeferredIncomeTaxExpenseBenefit	16,543us-gaap_DeferredIncomeTaxExpenseBenefit	8,551us-gaap_DeferredIncomeTaxExpenseBenefit
Total provision	$ 30,309us-gaap_IncomeTaxExpenseBenefit	$ 43,445us-gaap_IncomeTaxExpenseBenefit	$ 43,304us-gaap_IncomeTaxExpenseBenefit

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