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ACCRUED WORKERS' COMPENSATION AND PNEUMOCONIOSIS BENEFITS - Workers' Comp (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Reconciliation of changes in the workers' compensation liability |  |
Beginning balance | $ 49,452 | $ 53,448
Changes in accruals | 12,155 | 7,384
Payments | (14,438) | (12,708)
Interest accretion | 2,202 | 1,147
Valuation loss (gain) | (1,396) | 181
Ending balance | $ 47,975 | $ 49,452
Estimated present value of future obligations and other information |  |
Workers' compensation discount rate | 4.66% | 4.87%
Letters of credit outstanding to secure workers compensation obligations | $ 99,400 | $ 99,800
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 of letters of credit and other surety bonds that are available for the future payment of workers' compensation obligations. + References No definition available. + Details
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- Definition Represents the change in the liability for workers' compensation due to payments made during the period. + References No definition available. + Details
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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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- Definition Percent discount applied to worker's compensation reserve liability to reduce the reserve to present value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-1 + Details
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