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Goodwill and Intangibles - Summary of Change in Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Goodwill (Gross), beginning balance $ 243,053 $ 225,470
Business combinations 22,405 17,023
Other 198 560
Goodwill (Gross), ending balance 265,656 243,053
Accumulated Impairment Losses, beginning balance (70,004) (70,004)
Business combinations 0 0
Other 0 0
Accumulated Impairment Losses, ending balance (70,004) (70,004)
Goodwill (Net), beginning balance 173,049 155,466
Business Combinations 22,405 17,023
Other 198 560
Goodwill (Net), ending balance $ 195,652 $ 173,049