BUSINESS COMBINATIONS - Assets Acquired and Liabilities Assumed (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2022	Jun. 17, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Goodwill	$ 1,246,327,000		$ 1,246,327,000		$ 1,227,042,000
Measurement Period Adjustments, Goodwill			(6,762,000)
June 17, 2022 Acquisition
Business Acquisition [Line Items]
Accounts receivable, including unbilled receivables	1,076,000		1,076,000	$ 1,079,000
Inventories and supplies	5,816,000		5,816,000	5,737,000
Prepaid expenses and other current assets	134,000		134,000	269,000
Property, plant and equipment	23,325,000		23,325,000	23,270,000
Permits and other intangibles	16,750,000		16,750,000	16,750,000
Operating lease right-of-use assets	585,000		585,000	585,000
Other non-current assets	13,000		13,000	42,000
Current liabilities	(3,193,000)		(3,193,000)	(2,756,000)
Current portion of operating lease liabilities	(186,000)		(186,000)	(186,000)
Operating lease liabilities, less current portion	(399,000)		(399,000)	(399,000)
Other long-term liabilities	(55,000)		(55,000)	0
Total identifiable net assets	43,866,000		43,866,000	44,391,000
Goodwill	34,702,000		34,702,000	29,375,000
Total purchase price	78,568,000		78,568,000	$ 73,766,000
Measurement Period Adjustments, Accounts receivable, including unbilled receivables	(3,000)
Measurement Period Adjustments, Inventory	79,000
Measurement Period Adjustments, Prepaid expenses and other current assets	(135,000)
Measurement Period Adjustments, Property, plant and equipment	55,000
Measurement Period Adjustments, Other non-current assets	(29,000)
Measurement Period Adjustments, Current liabilities	(437,000)
Measurement Period Adjustments, Other long-term liabilities	(55,000)
Measurement Period Adjustments, Total identifiable net assets	(525,000)
Measurement Period Adjustments, Goodwill	5,327,000
Measurement Period Adjustments, Total purchase price	4,802,000
HydroChemPSC
Business Acquisition [Line Items]
Accounts receivable, including unbilled receivables	131,516,000		131,516,000		131,924,000
Inventories and supplies	3,162,000		3,162,000		3,162,000
Prepaid expenses and other current assets	16,291,000		16,291,000		16,016,000
Property, plant and equipment	314,397,000		314,397,000		313,540,000
Permits and other intangibles	289,000,000		289,000,000		289,000,000
Operating lease right-of-use assets	34,415,000		34,415,000		34,347,000
Other non-current assets	962,000		962,000		1,045,000
Current liabilities	(118,854,000)		(118,854,000)		(115,704,000)
Current portion of operating lease liabilities	(11,277,000)		(11,277,000)		(11,659,000)
Operating lease liabilities, less current portion	(26,344,000)		(26,344,000)		(26,128,000)
Deferred tax liabilities	(80,386,000)		(80,386,000)		(85,908,000)
Other long-term liabilities	(4,170,000)		(4,170,000)		(2,685,000)
Total identifiable net assets	548,712,000		548,712,000		546,950,000
Goodwill	676,701,000		676,701,000		683,463,000
Total purchase price	1,225,413,000		1,225,413,000		$ 1,230,413,000
Measurement Period Adjustments, Accounts receivable, including unbilled receivables			(408,000)
Measurement Period Adjustments, Prepaid expenses and other current assets			275,000
Measurement Period Adjustments, Property, plant and equipment			857,000
Measurement Period Adjustments, Operating lease right-of-use assets			68,000
Measurement Period Adjustments, Other non-current assets			(83,000)
Measurement Period Adjustments, Current liabilities			(3,150,000)
Measurement Period Adjustments, Current portion of operating lease liabilities			382,000
Measurement Period Adjustments, Operating lease liabilities, less current portion			(216,000)
Measurement Period Adjustments, Deferred tax liabilities			5,522,000
Measurement Period Adjustments, Other long-term liabilities			(1,485,000)
Measurement Period Adjustments, Total identifiable net assets			1,762,000
Measurement Period Adjustments, Goodwill			(6,762,000)
Measurement Period Adjustments, Total purchase price		$ (5,000,000)	(5,000,000)
Goodwill, deductible for tax purposes	$ 0		$ 0