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Goodwill and Intangible Assets - Schedule of Changes in Intangible Assets, Net of Accumulated Amortization (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finite-lived Intangible Assets [Roll Forward]      
Net balance at January 1 $ 123,000    
Additions 0 $ 110,680  
Amortization expense (10,509) (9,434)  
Currency translation (3,064) 4,827  
Net balance at December 31 109,500 123,000  
Intangible assets, net (Note 12) $ 169,515 $ 183,088 $ 77,015