Taxation - Components of Income Tax Expense (Benefit) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ 158us-gaap_CurrentFederalTaxExpenseBenefit	$ 1,114us-gaap_CurrentFederalTaxExpenseBenefit	$ 1,529us-gaap_CurrentFederalTaxExpenseBenefit
State	(34)	334	425
Foreign	1,108us-gaap_CurrentForeignTaxExpenseBenefit	836us-gaap_CurrentForeignTaxExpenseBenefit	471us-gaap_CurrentForeignTaxExpenseBenefit
Total current	1,232us-gaap_CurrentIncomeTaxExpenseBenefit	2,284us-gaap_CurrentIncomeTaxExpenseBenefit	2,425us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	(7,260)	642	9
State	(959)	(78)	1
Foreign	(1,091)	(84)	(133)
Total deferred	(9,310)us-gaap_DeferredIncomeTaxExpenseBenefit	480us-gaap_DeferredIncomeTaxExpenseBenefit	(123)us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax (benefit) expense	$ (8,078)us-gaap_IncomeTaxExpenseBenefit	$ 2,764us-gaap_IncomeTaxExpenseBenefit	$ 2,302us-gaap_IncomeTaxExpenseBenefit

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