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Goodwill and Intangible Assets - Goodwill (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Beginning balance, Goodwill Gross Carrying Amount $ 731,272 $ 735,323
Acquired goodwill 471,727  
Foreign currency translation, Gross Carrying Amount (4,632) (4,051)
Ending balance, Goodwill Gross Carrying Amount 1,198,367 731,272
Beginning balance, Accumulated Impairment Loss (144,276) (144,276)
Ending balance, Accumulated Impairment Loss (144,276) (144,276)
Beginning balance, Goodwill Net 586,996 591,047
Acquired goodwill 471,727  
Foreign currency translation, Net (4,632) (4,051)
Ending balance, Goodwill Net $ 1,054,091 $ 586,996