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Goodwill and Other Intangible Assets, Net - Summary of Changes in Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]    
Balance at January 1, 2018 $ 515,321 $ 477,532
Acquisitions 27,984 40,157
Measurement period adjustments (180) (2,368)
Balance at December 31, 2018 $ 543,125 $ 515,321