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WORKERS' COMPENSATION AND PNEUMOCONIOSIS - Liability (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Reconciliation of changes in the workers' compensation liability
Beginning balance	$ 53,448	$ 54,739
Accruals increase	2,275	1,672
Payments	(2,804)	(2,410)
Interest accretion	287	232
Ending balance	53,206	$ 54,233
Other long-term assets
Estimated present value of future obligations and other information
Receivables for traumatic injury claims	$ 5,700

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Represents the change in the liability for workers' compensation due to payments made during the period.

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

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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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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.

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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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