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Goodwill and Intangible Assets - Goodwill (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
Beginning balance, Goodwill Gross Carrying Amount $ 727,999 $ 339,117
Acquired goodwill, Gross Carrying Amount   396,027
Sale of business, Gross Carrying Amount (3,115)  
Foreign currency translation, Gross Carrying Amount 10,439 (7,145)
Ending balance, Goodwill Gross Carrying Amount 735,323 727,999
Beginning balance, Accumulated Impairment (Loss) (139,414) (139,414)
Acquired goodwill, Accumulated Impairment (Loss) 0 0
Impairment loss, Accumulated Impairment (Loss) (4,862)  
Foreign currency translation, Accumulated Impairment (Loss) 0 0
Ending balance, Accumulated Impairment (Loss) (144,276) (139,414)
Beginning balance, Goodwill Net 588,585 199,703
Acquired goodwill, Net   396,027
Sale of business, Net (3,115)  
Impairment loss, Net (4,862)  
Foreign currency translation, Net 10,439 (7,145)
Ending balance, Goodwill Net $ 591,047 $ 588,585