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Goodwill and Intangible Assets - Schedule of Changes in Goodwill (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Roll Forward]    
Net balance at January 1 $ 340,338 $ 252,520
Additions (Note 13) 10,485 97,959
Disposal (338) 0
Currency translation (17,209) (10,141)
Net balance at December 31 $ 333,276 $ 340,338