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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 |  |

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