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CLOSURE AND POST-CLOSURE LIABILITIES (Tables) | 9 Months Ended
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Sep. 30, 2025
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Closure and Post-Closure Liabilities | The changes to closure and post-closure liabilities (also referred to as “asset retirement obligations”) from January 1, 2025 through September 30, 2025 were as follows (in thousands):
| Landfill Retirement Liability |  | Non-Landfill Retirement Liability |  | Total
Balance at January 1, 2025 | $ | 59,400 |  |  | $ | 70,388 |  |  | $ | 129,788 |
Measurement period adjustments from prior period acquisitions | — |  |  | 420 |  |  | 420 |
New asset retirement obligations | 2,838 |  |  | — |  |  | 2,838 |
Accretion | 3,739 |  |  | 4,112 |  |  | 7,851 |
Changes in estimates recorded to consolidated statement of operations | 467 |  |  | 377 |  |  | 844 |
Changes in estimates recorded to consolidated balance sheet | — |  |  | 890 |  |  | 890 |
Expenditures | (2,496) |  |  | (970) |  |  | (3,466) |
Currency translation and other | 123 |  |  | 54 |  |  | 177 |
Balance at September 30, 2025 | $ | 64,071 |  |  | $ | 75,271 |  |  | $ | 139,342 |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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