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WORKERS' COMPENSATION AND PNEUMOCONIOSIS - Liability (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reconciliation of changes in the workers' compensation liability
Beginning balance	$ 54,739	$ 53,384
Accruals increase	1,672	1,748
Payments	(2,410)	(2,571)
Interest accretion	232	319
Ending balance	54,233	$ 52,880
Receivables for traumatic injury claims	$ 7,100

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- Definition

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

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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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- 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.

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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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