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Goodwill and Intangible Assets - Finite Lived Intangible Assets Amortization Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]    
Intangible assets - finite life, Beginning of period $ 60,728 $ 74,957
Amortization expense (2,890) (3,935)
Foreign currency adjustments 68 294
Intangible assets - finite life, End of period $ 57,906 $ 71,316