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GOODWILL AND INTANGIBLE ASSETS - Components of Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]      
Intangible assets $ 66,113 $ 36,179  
Less accumulated amortization (31,346) (28,030)  
Intangible assets, net 34,767 8,149  
Intangible amortization expenses 3,316 2,061 $ 2,141
Covenants Not-to-Compete      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets 21,750 18,092  
Less accumulated amortization (17,584) (16,851)  
Intangible assets, net 4,166 1,241  
Client Lists      
Finite-Lived Intangible Assets [Line Items]      
Intangible assets 44,363 18,087  
Less accumulated amortization (13,762) (11,179)  
Intangible assets, net $ 30,601 $ 6,908