GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets by Intangible Asset Type (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 33,665	$ 33,331
Less accumulated amortization	(25,433)	(24,079)
Intangible assets, net	8,232	9,252
Covenants Not-to-Compete
Finite-Lived Intangible Assets [Line Items]
Intangible assets	17,594	17,266
Less accumulated amortization	(16,288)	(16,198)
Intangible assets, net	1,306	1,068
Client Lists
Finite-Lived Intangible Assets [Line Items]
Intangible assets	16,071	16,065
Less accumulated amortization	(9,145)	(7,881)
Intangible assets, net	$ 6,926	$ 8,184