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Workers' Compensation And Pneumoconiosis - WorkComp Roll (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Reconciliation of changes in the workers' compensation liability |  |  |  |  |  |
Beginning balance | $ 48,511 | $ 47,561 | $ 47,870 | $ 47,975 | $ 47,975 |
Changes in accruals | 3,419 | 3,365 | 6,795 | 6,490 |  |
Payments | (3,762) | (3,446) | (7,064) | (7,494) |  |
Interest accretion | 570 | 509 | 1,137 | 1,018 |  |
Valuation loss (gain) | 496 | (795) | 496 | (795) |  |
Ending balance | 49,234 | $ 47,194 | $ 49,234 | $ 47,194 | $ 47,870 | $ 47,975
Estimated present value of future obligations and other information |  |  |  |  |  |
Workers' compensation discount rate |  |  | 4.92% | 5.18% | 5.17% | 4.66%
Receivables for traumatic injury claims | $ 3,700 |  | $ 3,700 |  |  |

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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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