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GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets by Intangible Asset Type (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Intangible assets $ 35,483 $ 33,665
Less accumulated amortization (27,487) (25,969)
Intangible assets, net 7,996 7,696
Covenants Not-to-Compete    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets 17,975 17,594
Less accumulated amortization (16,739) (16,402)
Intangible assets, net 1,236 1,192
Client Lists    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets 17,508 16,071
Less accumulated amortization (10,748) (9,567)
Intangible assets, net $ 6,760 $ 6,504