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Goodwill and Intangible Assets - Goodwill (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Beginning balance, Goodwill Gross Carrying Amount $ 731,272 $ 735,323
Acquired goodwill 471,403  
Foreign currency translation, Gross Carrying Amount (1,068) (4,051)
Ending balance, Goodwill Gross Carrying Amount 1,201,607 731,272
Beginning balance, Accumulated Impairment Loss (144,276) (144,276)
Acquired goodwill 0 0
Foreign currency translation, Accumulated Impairment Loss 0 0
Ending balance, Accumulated Impairment Loss (144,276) (144,276)
Beginning balance, Goodwill Net 586,996 591,047
Foreign currency translation, Net (1,068) (4,051)
Ending balance, Goodwill Net $ 1,057,331 $ 586,996