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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 |

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