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Goodwill - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]    
Beginning balance $ 200,833us-gaap_Goodwill $ 201,339us-gaap_Goodwill
Acquisitions 0us-gaap_GoodwillAcquiredDuringPeriod 13us-gaap_GoodwillAcquiredDuringPeriod
Foreign currency translation adjustments (1,345)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments (519)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
Ending balance $ 199,488us-gaap_Goodwill $ 200,833us-gaap_Goodwill