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BUSINESS COMBINATIONS - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Oct. 08, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 1,227,042 |  | $ 527,023 | $ 525,013
HydroChemPSC |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Accounts receivable, including unbilled receivables |  | $ 131,924 |  |
Inventories and supplies |  | 3,162 |  |
Prepaid expenses and other current assets |  | 16,016 |  |
Property, plant and equipment |  | 313,540 |  |
Other intangibles |  | 289,000 |  |
Operating lease right-of-use assets |  | 34,347 |  |
Other non-current assets |  | 1,045 |  |
Current liabilities |  | (115,704) |  |
Current portion of operating lease liabilities |  | (11,659) |  |
Operating lease liabilities, less current portion |  | (26,128) |  |
Deferred tax liabilities |  | (85,908) |  |
Other long-term liabilities |  | (2,685) |  |
Total identifiable net assets |  | 546,950 |  |
Goodwill |  | 683,463 |  |
Total purchase price |  | $ 1,230,413 |  |

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