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Workers' Compensation And Pneumoconiosis - WorkComp Roll (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Reconciliation of changes in the workers' compensation liability
Beginning balance	$ 49,234	$ 47,194	$ 47,870	$ 47,975	$ 47,975
Changes in accruals	3,418	3,658	10,213	10,148
Payments	(3,608)	(3,784)	(10,672)	(11,278)
Interest accretion	569	509	1,706	1,527
Valuation loss (gain)	0	0	496	(795)
Ending balance	49,613	$ 47,577	$ 49,613	$ 47,577	$ 47,870	$ 47,975
Estimated present value of future obligations and other information
Workers' compensation discount rate			4.92%	5.18%	5.17%	4.66%
Receivables for traumatic injury claims	$ 3,700		$ 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 an adjustment for valuation gain or loss.

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- Definition

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

+ References

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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

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

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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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