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GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets by Intangible Asset Type (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Intangible assets $ 107,065 $ 105,780
Less accumulated amortization (49,484) (47,456)
Intangible assets, net 57,581 58,324
Covenants Not-to-Compete    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets 27,302 26,971
Less accumulated amortization (20,944) (20,547)
Intangible assets, net 6,358 6,424
Client Lists    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets 79,763 78,809
Less accumulated amortization (28,540) (26,909)
Intangible assets, net $ 51,223 $ 51,900