INTANGIBLE ASSETS - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 213,413	$ 120,280
Accumulated Amortization	(37,309)	(21,161)
Net Carrying Amount	176,104	99,119
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	174,742	103,288
Accumulated Amortization	(25,508)	(12,995)
Net Carrying Amount	149,234	90,293
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,397	4,898
Accumulated Amortization	(3,896)	(3,468)
Net Carrying Amount	1,501	1,430
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	24,624	6,299
Accumulated Amortization	(4,216)	(1,940)
Net Carrying Amount	20,408	4,359
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,812	5,112
Accumulated Amortization	(3,364)	(2,541)
Net Carrying Amount	4,448	2,571
Licenses
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	838	683
Accumulated Amortization	(325)	(217)
Net Carrying Amount	$ 513	$ 466