BUSINESS COMBINATIONS - Assets Acquired and Liabilities Assumed (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Oct. 08, 2021
Business Acquisition [Line Items]
Goodwill		$ 1,287,736,000	$ 1,246,878,000	$ 1,227,042,000
Measurement Period Adjustments, Goodwill		360,000	(6,762,000)
Thompson Industrial
Business Acquisition [Line Items]
Accounts receivable, including unbilled receivables		25,233,000
Inventories and supplies		228,000
Prepaid expenses and other current assets		1,302,000
Property, plant and equipment		26,719,000
Other intangibles		28,900,000
Operating lease right-of-use assets		4,716,000
Other long-term assets		72,000
Current liabilities		(10,385,000)
Current portion of operating lease liabilities		(1,653,000)
Operating lease liabilities, less current portion		(3,063,000)
Other long-term liabilities		(560,000)
Total identifiable net assets		71,509,000
Goodwill		39,346,000
Total purchase price		110,855,000
June 17, 2022 Acquisition
Business Acquisition [Line Items]
Accounts receivable, including unbilled receivables		1,089,000	1,111,000
Inventories and supplies		5,745,000	5,816,000
Prepaid expenses and other current assets		144,000	144,000
Property, plant and equipment		22,231,000	19,605,000
Other intangibles		23,500,000	23,500,000
Operating lease right-of-use assets		585,000	585,000
Other long-term assets		13,000	13,000
Current liabilities		(3,375,000)	(3,271,000)
Current portion of operating lease liabilities		(186,000)	(186,000)
Operating lease liabilities, less current portion		(399,000)	(399,000)
Other long-term liabilities		(2,681,000)	(55,000)
Total identifiable net assets		46,666,000	46,863,000
Goodwill		32,212,000	32,015,000
Total purchase price		78,878,000	$ 78,878,000
Measurement Period Adjustments, Accounts receivable, including unbilled receivables		(22,000)
Measurement Period Adjustments, Inventories and supplies		(71,000)
Measurement Period Adjustments, Prepaid expenses and other current assets		0
Measurement Period Adjustments, Property, plant and equipment		2,626,000
Measurement Period Adjustments, Permits and other intangibles		0
Measurement Period Adjustments, Operating lease right-of-use assets		0
Measurement Period Adjustments, Other non-current assets		0
Measurement Period Adjustments, Current liabilities		(104,000)
Measurement Period Adjustments, Current portion of operating lease liabilities		0
Measurement Period Adjustments, Operating lease liabilities, less current portion		0
Measurement Period Adjustments, Other long-term liabilities		(2,626,000)
Measurement Period Adjustments, Total identifiable net assets		(197,000)
Measurement Period Adjustments, Goodwill		197,000
Measurement Period Adjustments, Total purchase price		0
HydroChemPSC
Business Acquisition [Line Items]
Accounts receivable, including unbilled receivables		131,516,000
Inventories and supplies		3,162,000
Prepaid expenses and other current assets		16,291,000
Property, plant and equipment		314,397,000
Other intangibles		289,000,000
Operating lease right-of-use assets		34,415,000
Other long-term assets		962,000
Current liabilities		(118,854,000)
Current portion of operating lease liabilities		(11,277,000)
Operating lease liabilities, less current portion		(26,344,000)
Deferred tax liabilities		(80,386,000)
Other long-term liabilities		(4,170,000)
Total identifiable net assets		548,712,000
Goodwill		676,701,000
Total purchase price		1,225,413,000
Measurement Period Adjustments, Total purchase price	$ (5,000,000)
Goodwill, deductible for tax purposes		$ 0
HydroChemPSC | Environmental sales & service reporting unit
Business Acquisition [Line Items]
Goodwill					$ 676,700,000