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GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets by Type (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
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