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WORKERS' COMPENSATION AND PNEUMOCONIOSIS - Roll forward (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Reconciliation of changes in the workers' compensation liability |  |  |  |  |
Beginning balance | $ 47,561 | $ 50,017 | $ 47,975 | $ 49,452 | $ 49,452
Changes in accruals | 3,365 | 2,196 | 6,490 | 6,070 |
Payments | (3,446) | (2,646) | (7,494) | (6,505) |
Interest accretion | 509 | 551 | 1,018 | 1,101 |
Valuation loss (gain) | (795) | 990 | (795) | 990 |
Ending balance | 47,194 | $ 51,108 | $ 47,194 | $ 51,108 | $ 47,975
Estimated present value of future obligations and other information |  |  |  |  |
Workers' compensation discount rate |  |  | 5.18% |  | 4.66%
Other long-term assets |  |  |  |  |
Estimated present value of future obligations and other information |  |  |  |  |
Receivables for traumatic injury claims | $ 4,100 |  | $ 4,100 |  |

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- Definition Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 35 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481639/420-10-35-4 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 + Details
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- Definition Carrying amount due after one year of the balance sheet date (or one operating cycle, if longer) of amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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