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DEBT - Components of Interest Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |  |
Interest expense on long-term debt and finance leases | $ 44,836 | $ 21,691 | $ 19,201
Amortization of debt issuance costs | 2,962 | 1,903 | 2,288
Letter of credit fees | 423 | 458 | 458
Less: capitalized interest | (643) | (330) | (718)
Total interest expense | 47,578 | $ 23,722 | $ 21,229
GFL Environmental Inc |  |  |
Debt Instrument [Line Items] |  |  |
Amortization of debt issuance costs | 395 |  |
Twin Bridges Acquisition |  |  |
Debt Instrument [Line Items] |  |  |
Amortization of debt issuance costs | $ 101 |  |

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