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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Goodwill And Intangible Assets Disclosure [Abstract]        
Intangible assets – finite life, net at beginning of period     $ 49,956 $ 60,728
Amortization expense $ (2,300) $ (2,900) (7,355) (8,666)
Divestitures     (4,083)  
Foreign currency adjustments     30 687
Intangible assets – finite life, net at end of period $ 38,548 $ 52,749 $ 38,548 $ 52,749