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Income Taxes - Components of the Income Tax Provision (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ 11,644us-gaap_CurrentFederalTaxExpenseBenefit	$ 8,286us-gaap_CurrentFederalTaxExpenseBenefit	$ 12,420us-gaap_CurrentFederalTaxExpenseBenefit
State	2,239us-gaap_CurrentStateAndLocalTaxExpenseBenefit	1,624us-gaap_CurrentStateAndLocalTaxExpenseBenefit	3,069us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign	1,167us-gaap_CurrentForeignTaxExpenseBenefit	1,587us-gaap_CurrentForeignTaxExpenseBenefit	1,336us-gaap_CurrentForeignTaxExpenseBenefit
Total current	15,050us-gaap_CurrentIncomeTaxExpenseBenefit	11,497us-gaap_CurrentIncomeTaxExpenseBenefit	16,825us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	(6,470)us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(3,935)us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(4,449)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State	(1,095)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	(562)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	(736)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign	39us-gaap_DeferredForeignIncomeTaxExpenseBenefit	(32)us-gaap_DeferredForeignIncomeTaxExpenseBenefit	(5,782)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total deferred	(7,526)us-gaap_DeferredIncomeTaxExpenseBenefit	(4,529)us-gaap_DeferredIncomeTaxExpenseBenefit	(10,967)us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax provision	$ 7,524us-gaap_IncomeTaxExpenseBenefit	$ 6,968us-gaap_IncomeTaxExpenseBenefit	$ 5,858us-gaap_IncomeTaxExpenseBenefit

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