INTANGIBLE ASSETS - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 214,345	$ 213,413
Accumulated Amortization	(54,184)	(37,309)
Net Carrying Amount	160,161	176,104
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	175,226	174,742
Accumulated Amortization	(38,712)	(25,508)
Net Carrying Amount	136,514	149,234
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,563	5,397
Accumulated Amortization	(4,509)	(3,896)
Net Carrying Amount	1,054	1,501
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	24,830	24,624
Accumulated Amortization	(6,211)	(4,216)
Net Carrying Amount	18,619	20,408
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,867	7,812
Accumulated Amortization	(4,292)	(3,364)
Net Carrying Amount	3,575	4,448
Licenses
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	859	838
Accumulated Amortization	(460)	(325)
Net Carrying Amount	$ 399	$ 513