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Goodwill and Other Intangible Assets Changes in Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Goodwill [Roll Forward]    
Goodwill, beginning of period $ 433,374  
Goodwill from businesses acquired 207,126  
Currency translation effect on foreign goodwill balances (3,014)  
Goodwill, end of period 637,486  
Intangible Assets, Net (Excluding Goodwill) 877,945 $ 347,212
Intangible Assets, Net (Including Goodwill) $ 1,515,431 $ 780,586