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ACCRUED WORKERS' COMPENSATION AND PNEUMOCONIOSIS BENEFITS - Workers' Comp (Detail) - USD ($) $ in Thousands	12 Months Ended
	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

X

- 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

Represents the change in the liability for workers' compensation due to an adjustment for valuation gain or loss.

+ 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.

+ References

No definition available.

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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
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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
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- Definition

Percent discount applied to worker's compensation reserve liability to reduce the reserve to present value.

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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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