INTANGIBLE ASSETS - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 214,600	$ 213,816
Accumulated Amortization	(111,318)	(96,797)
Net Carrying Amount	103,282	117,019
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	175,418	174,940
Accumulated Amortization	(76,541)	(63,727)
Net Carrying Amount	98,877	111,213
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,569	5,466
Accumulated Amortization	(5,569)	(5,306)
Net Carrying Amount	0	160
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	24,870	24,724
Accumulated Amortization	(21,794)	(21,146)
Net Carrying Amount	3,076	3,578
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,879	7,838
Accumulated Amortization	(6,691)	(5,976)
Net Carrying Amount	1,188	1,862
Licenses
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	864	848
Accumulated Amortization	(723)	(642)
Net Carrying Amount	$ 141	$ 206