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Goodwill and Intangibles - Summary of Change in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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

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