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Income Taxes - 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		$ 11us-gaap_CurrentFederalTaxExpenseBenefit
State	42us-gaap_CurrentStateAndLocalTaxExpenseBenefit	22us-gaap_CurrentStateAndLocalTaxExpenseBenefit	1us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign	4,688us-gaap_CurrentForeignTaxExpenseBenefit	3,121us-gaap_CurrentForeignTaxExpenseBenefit	4,402us-gaap_CurrentForeignTaxExpenseBenefit
Total current	4,730us-gaap_CurrentIncomeTaxExpenseBenefit	3,154us-gaap_CurrentIncomeTaxExpenseBenefit	4,403us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	(497)us-gaap_DeferredFederalIncomeTaxExpenseBenefit	338us-gaap_DeferredFederalIncomeTaxExpenseBenefit	866us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State	361us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	(289)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	93us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign	715us-gaap_DeferredForeignIncomeTaxExpenseBenefit	(56)us-gaap_DeferredForeignIncomeTaxExpenseBenefit	106us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total deferred	579us-gaap_DeferredIncomeTaxExpenseBenefit	(7)us-gaap_DeferredIncomeTaxExpenseBenefit	1,065us-gaap_DeferredIncomeTaxExpenseBenefit
Total	$ 5,309us-gaap_IncomeTaxExpenseBenefit	$ 3,147us-gaap_IncomeTaxExpenseBenefit	$ 5,468us-gaap_IncomeTaxExpenseBenefit

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