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GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets by Intangible Asset Type (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Intangible assets $ 33,928 $ 33,665
Less accumulated amortization (26,456) (25,969)
Intangible assets, net 7,472 7,696
Covenants Not-to-Compete    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets 17,624 17,594
Less accumulated amortization (16,517) (16,402)
Intangible assets, net 1,107 1,192
Client Lists    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets 16,304 16,071
Less accumulated amortization (9,939) (9,567)
Intangible assets, net $ 6,365 $ 6,504