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GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets by Type (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | $ 147,540 | $ 105,780
Less accumulated amortization | (54,632) | (47,456)
Intangible assets, net | 92,908 | 58,324
Covenants Not-to-Compete |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | 29,514 | 26,971
Less accumulated amortization | (21,752) | (20,547)
Intangible assets, net | 7,762 | 6,424
Client Lists |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | 109,676 | 78,809
Less accumulated amortization | (32,298) | (26,909)
Intangible assets, net | 77,378 | $ 51,900
Trade Names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | 8,350 |
Less accumulated amortization | (582) |
Intangible assets, net | $ 7,768 |

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