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Goodwill and Intangible Assets - Goodwill (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Beginning balance, Goodwill Gross Carrying Amount $ 735,323 $ 727,999
Sale of business, Gross Carrying Amount   (3,115)
Foreign currency translation, Gross Carrying Amount (4,051) 10,439
Ending balance, Goodwill Gross Carrying Amount 731,272 735,323
Beginning balance, Accumulated Impairment Loss (144,276) (139,414)
Impairment loss, Accumulated Impairment Loss   (4,862)
Foreign currency translation, Accumulated Impairment Loss 0 0
Ending balance, Accumulated Impairment Loss (144,276) (144,276)
Beginning balance, Goodwill Net 591,047 588,585
Sale of business, Net   (3,115)
Impairment loss, Net   (4,862)
Foreign currency translation, Net (4,051) 10,439
Ending balance, Goodwill Net $ 586,996 $ 591,047