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Intangible Assets and Goodwill - Schedule of Changes in Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]  
Beginning Balance $ 72,463us-gaap_Goodwill
Effect of changes in foreign currency exchange rates (294)us-gaap_GoodwillTranslationAdjustments
Ending Balance $ 72,169us-gaap_Goodwill