BUSINESS COMBINATIONS - Assets Acquired and Liabilities Assumed (Details) - USD ($)	3 Months Ended	6 Months Ended
	Mar. 31, 2022	Jun. 30, 2022	Jun. 17, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Goodwill		$ 1,244,655,000		$ 1,227,042,000
Measurement Period Adjustments, Goodwill		(6,453,000)
June 17, 2022 Acquisition
Business Acquisition [Line Items]
Accounts receivable, including unbilled receivables			$ 1,079,000
Inventories and supplies			5,737,000
Prepaid expenses and other current assets			269,000
Property, plant and equipment			23,270,000
Other intangibles			16,750,000
Operating lease right-of-use assets			585,000
Other non-current assets			42,000
Current liabilities			(2,756,000)
Current portion of operating lease liabilities			(186,000)
Operating lease liabilities, less current portion			(399,000)
Total identifiable net assets			44,391,000
Goodwill			29,375,000
Total purchase price			73,766,000
Goodwill, deductible for tax purposes			$ 29,375,000
HydroChemPSC
Business Acquisition [Line Items]
Accounts receivable, including unbilled receivables		131,529,000		131,924,000
Inventories and supplies		3,162,000		3,162,000
Prepaid expenses and other current assets		16,379,000		16,016,000
Property, plant and equipment		313,540,000		313,540,000
Other intangibles		289,000,000		289,000,000
Operating lease right-of-use assets		34,415,000		34,347,000
Other non-current assets		985,000		1,045,000
Current liabilities		(116,587,000)		(115,704,000)
Current portion of operating lease liabilities		(11,277,000)		(11,659,000)
Operating lease liabilities, less current portion		(26,344,000)		(26,128,000)
Deferred tax liabilities		(83,472,000)		(85,908,000)
Other long-term liabilities		(2,927,000)		(2,685,000)
Total identifiable net assets		548,403,000		546,950,000
Goodwill		677,010,000		683,463,000
Total purchase price		1,225,413,000		$ 1,230,413,000
Measurement Period Adjustments, Accounts receivable, including unbilled receivables		(395,000)
Measurement Period Adjustments, Prepaid expenses and other current assets		363,000
Measurement Period Adjustments, Operating lease right-of-use assets		68,000
Measurement Period Adjustments, Other non-current assets		(60,000)
Measurement Period Adjustments, Current liabilities		(883,000)
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		2,436,000
Measurement Period Adjustments, Other long-term liabilities		(242,000)
Measurement Period Adjustments, Total identifiable net assets		1,453,000
Measurement Period Adjustments, Goodwill		(6,453,000)
Measurement Period Adjustments, Total purchase price	$ (5,000,000)	(5,000,000)
Goodwill, deductible for tax purposes		$ 0