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GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets by Type (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Intangible assets $ 107,426 $ 105,780
Less accumulated amortization (51,499) (47,456)
Intangible assets, net 55,927 58,324
Covenants Not-to-Compete    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets 27,390 26,971
Less accumulated amortization (21,323) (20,547)
Intangible assets, net 6,067 6,424
Client Lists    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets 80,036 78,809
Less accumulated amortization (30,176) (26,909)
Intangible assets, net $ 49,860 $ 51,900