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Goodwill and Intangible Assets - Finite Lived Intangible Assets Amortization Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Goodwill And Intangible Assets Disclosure [Abstract]        
Intangible assets – finite life, net at beginning of period     $ 60,728 $ 74,957
Amortization expense $ (2,900) $ (3,500) (8,666) (11,123)
Foreign currency adjustments     687 142
Intangible assets – finite life, net at end of period $ 52,749 $ 63,976 $ 52,749 $ 63,976