BUSINESS COMBINATIONS - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended	15 Months Ended
	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Oct. 08, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill		$ 1,246,878	$ 1,246,878	$ 1,227,042		$ 527,023
Measurement Period Adjustments, Goodwill		(6,762)
June 17, 2022 Acquisition
Business Acquisition [Line Items]
Accounts receivable, including unbilled receivables		1,111	1,111
Inventories and supplies		5,816	5,816
Prepaid expenses and other current assets		144	144
Property, plant and equipment		19,605	19,605
Other intangibles		23,500	23,500
Operating lease right-of-use assets		585	585
Other non-current assets		13	13
Current liabilities		(3,271)	(3,271)
Current portion of operating lease liabilities		(186)	(186)
Operating lease liabilities, less current portion		(399)	(399)
Other long-term liabilities		(55)	(55)
Total identifiable net assets		46,863	46,863
Goodwill		32,015	32,015
Total purchase price		78,878	78,878
HydroChemPSC
Business Acquisition [Line Items]
Accounts receivable, including unbilled receivables		131,516	131,516		$ 131,924
Inventories and supplies		3,162	3,162		3,162
Prepaid expenses and other current assets		16,291	16,291		16,016
Property, plant and equipment		314,397	314,397		313,540
Other intangibles		289,000	289,000		289,000
Operating lease right-of-use assets		34,415	34,415		34,347
Other non-current assets		962	962		1,045
Current liabilities		(118,854)	(118,854)		(115,704)
Current portion of operating lease liabilities		(11,277)	(11,277)		(11,659)
Operating lease liabilities, less current portion		(26,344)	(26,344)		(26,128)
Deferred tax liabilities		(80,386)	(80,386)		(85,908)
Other long-term liabilities		(4,170)	(4,170)		(2,685)
Total identifiable net assets		548,712	548,712		546,950
Goodwill		676,701	676,701		683,463
Total purchase price		$ 1,225,413	1,225,413		1,230,413
Measurement Period Adjustments, Accounts receivable, including unbilled receivables			(408)
Measurement Period Adjustments, Inventory			0
Measurement Period Adjustments, Prepaid expenses and other current assets			275
Measurement Period Adjustments, Property, plant and equipment			857
Measurement Period Adjustments, Permits and other intangibles			0
Measurement Period Adjustments, Operating lease right-of-use assets			68
Measurement Period Adjustments, Other non-current assets			(83)
Measurement Period Adjustments, Current liabilities			(3,150)
Measurement Period Adjustments, Current portion of operating lease liabilities			382
Measurement Period Adjustments, Operating lease liabilities, less current portion			(216)
Measurement Period Adjustments, Deferred tax liabilities			5,522
Measurement Period Adjustments, Other long-term liabilities			(1,485)
Measurement Period Adjustments, Total identifiable net assets			1,762
Measurement Period Adjustments, Goodwill			(6,762)
Measurement Period Adjustments, Total purchase price	$ (5,000)		$ (5,000)
HydroChemPSC | Environmental sales & service reporting unit
Business Acquisition [Line Items]
Goodwill					$ 676,700