INTANGIBLE ASSETS - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 213,778	$ 214,345
Accumulated Amortization	(82,406)	(54,184)
Net Carrying Amount	131,372	160,161
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	174,894	175,226
Accumulated Amortization	(51,160)	(38,712)
Net Carrying Amount	123,734	136,514
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,433	5,563
Accumulated Amortization	(4,882)	(4,509)
Net Carrying Amount	551	1,054
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	24,753	24,830
Accumulated Amortization	(20,594)	(6,211)
Net Carrying Amount	4,159	18,619
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,847	7,867
Accumulated Amortization	(5,187)	(4,292)
Net Carrying Amount	2,660	3,575
Licenses
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	851	859
Accumulated Amortization	(583)	(460)
Net Carrying Amount	$ 268	$ 399