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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Roll Forward]    
Balance as of beginning of year $ 131,014 $ 123,031
Goodwill from businesses acquired 293,390 17,010
Currency translation effect on foreign goodwill balances (2,841) (9,027)
Balance as of end of year $ 421,563 $ 131,014