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Goodwill and Intangibles - Summary of Change in Carrying Amount of Goodwill (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill (Gross), beginning balance $ 243,053
Business Combinations 11,332
Other 193
Goodwill (Gross), ending balance 254,578
Accumulated Impairment Losses, beginning balance (70,004)
Accumulated Impairment Losses, ending balance (70,004)
Goodwill (Net), beginning balance 173,049
Business Combinations 11,332
Other 193
Goodwill (Net), ending balance $ 184,574