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WORKERS' COMPENSATION AND PNEUMOCONIOSIS - WorkComp Roll (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Reconciliation of changes in the workers' compensation liability
Beginning balance	$ 47,870	$ 47,975
Changes in accruals	3,376	3,125
Payments	(3,302)	(4,048)
Interest accretion	567	509
Ending balance	48,511	$ 47,561
Estimated present value of future obligations and other information
Receivables for traumatic injury claims	$ 3,700

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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.

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- Definition

Represents the change in the liability for workers' compensation due to additional amounts accrued during the period.

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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.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 420
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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
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- Definition

Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature.

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