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Goodwill and Intangible Assets - Goodwill (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Beginning balance, Goodwill Gross Carrying Amount $ 731,272 $ 735,323
Acquired goodwill 473,951  
Foreign currency translation, Gross Carrying Amount (2,493) (4,051)
Ending balance, Goodwill Gross Carrying Amount 1,202,730 731,272
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 473,951  
Foreign currency translation, Net (2,493) (4,051)
Ending balance, Goodwill Net $ 1,058,454 $ 586,996