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CLOSURE AND POST-CLOSURE LIABILITIES (Tables) | 12 Months Ended
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Dec. 31, 2024
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, 2023 through December 31, 2024 were as follows (in thousands):
| Landfill Retirement Liability |  | Non-Landfill Retirement Liability |  | Total
Balance at January 1, 2023 | $ | 62,251 |  |  | $ | 56,550 |  |  | $ | 118,801 |
Liabilities assumed in acquisitions | — |  |  | 574 |  |  | 574 |
Measurement period adjustments from prior period acquisitions | — |  |  | 3,015 |  |  | 3,015 |
New asset retirement obligations | 3,092 |  |  | — |  |  | 3,092 |
Accretion | 4,958 |  |  | 4,519 |  |  | 9,477 |
Changes in estimates recorded to consolidated statement of operations | 1,147 |  |  | 53 |  |  | 1,200 |
Changes in estimates recorded to consolidated balance sheet | (3,706) |  |  | 1,600 |  |  | (2,106) |
Environmental expenditures | (8,478) |  |  | (7,206) |  |  | (15,684) |
Currency translation and other | 179 |  |  | 52 |  |  | 231 |
Balance at December 31, 2023 | 59,443 |  |  | 59,157 |  |  | 118,600 |
Liabilities assumed in acquisitions | — |  |  | 11,421 |  |  | 11,421 |
New asset retirement obligations | 2,118 |  |  | — |  |  | 2,118 |
Accretion | 5,069 |  |  | 4,489 |  |  | 9,558 |
Changes in estimates recorded to consolidated statement of operations | 70 |  |  | (295) |  |  | (225) |
Changes in estimates recorded to consolidated balance sheet | 4,335 |  |  | 402 |  |  | 4,737 |
Environmental expenditures | (11,210) |  |  | (4,466) |  |  | (15,676) |
Currency translation and other | (425) |  |  | (320) |  |  | (745) |
Balance at December 31, 2024 | $ | 59,400 |  |  | $ | 70,388 |  |  | $ | 129,788 |
Schedule of Expected Payments Related to Asset Retirement Obligations | Anticipated payments (based on current estimated costs and anticipated timing of necessary regulatory approvals to commence work on closure and post-closure activities) for each of the next five years and thereafter are as follows (in thousands):
Years ending December 31, |
2025 | $ | 10,304 |
2026 | 14,457 |
2027 | 12,485 |
2028 | 14,127 |
2029 | 3,224 |
Thereafter | 278,762 |
Undiscounted closure and post-closure liabilities | 333,359 |
Less: Discount at credit-adjusted risk-free rate | (119,353) |
Less: Undiscounted estimated closure and post-closure liabilities relating to airspace not yet consumed | (84,218) |
Present value of closure and post-closure liabilities | $ | 129,788 |

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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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