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GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets by Intangible Asset Type (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Intangible assets $ 77,732 $ 66,113
Less accumulated amortization (34,385) (31,346)
Intangible assets, net 43,347 34,767
Covenants Not-to-Compete    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets 25,669 21,750
Less accumulated amortization (18,195) (17,584)
Intangible assets, net 7,474 4,166
Client Lists    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets 52,063 44,363
Less accumulated amortization (16,190) (13,762)
Intangible assets, net $ 35,873 $ 30,601