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Goodwill and Intangible Assets - Finite Lived Intangible Assets Amortization Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]    
Intangible assets - finite life, Beginning of period $ 74,957 $ 58,398
Amortization expense (3,935) (2,622)
Foreign currency adjustments 294 (943)
Intangible assets - finite life, End of period $ 71,316 $ 54,833