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	$ 34,615us-gaap_CurrentFederalTaxExpenseBenefit	$ 43,159us-gaap_CurrentFederalTaxExpenseBenefit	$ 26,949us-gaap_CurrentFederalTaxExpenseBenefit
State	5,614	6,637	4,195
Foreign	135us-gaap_CurrentForeignTaxExpenseBenefit	120us-gaap_CurrentForeignTaxExpenseBenefit	118us-gaap_CurrentForeignTaxExpenseBenefit
Total Current	40,364us-gaap_CurrentIncomeTaxExpenseBenefit	49,916us-gaap_CurrentIncomeTaxExpenseBenefit	31,262us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred
Federal	(22)	(745)	(387)
State	(130)	(101)	(164)
Foreign	0	0	711
Total Deferred	(152)us-gaap_DeferredIncomeTaxExpenseBenefit	(846)us-gaap_DeferredIncomeTaxExpenseBenefit	160us-gaap_DeferredIncomeTaxExpenseBenefit
Total Provision for Income Taxes	$ 40,212us-gaap_IncomeTaxExpenseBenefit	$ 49,070us-gaap_IncomeTaxExpenseBenefit	$ 31,422us-gaap_IncomeTaxExpenseBenefit

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