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ACCRUED WORKERS' COMPENSATION AND PNEUMOCONIOSIS BENEFITS - WorkComp Roll (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Reconciliation of changes in the workers' compensation liability
Beginning balance	$ 47,975	$ 49,452
Changes in accruals	13,236	12,155
Payments	(14,473)	(14,438)
Interest accretion	2,037	2,202
Valuation loss	(905)	(1,396)
Ending balance	$ 47,870	$ 47,975
Estimated present value of future obligations and other information
Workers' compensation discount rate	5.17%	4.66%
Letters of credit outstanding to secure workers compensation obligations	$ 106,800	$ 99,400
Receivables for traumatic injury claims	$ 3,700	$ 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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Namespace Prefix:	arlp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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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Namespace Prefix:	arlp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

Name:	arlp_ValuationGainLoss
Namespace Prefix:	arlp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	arlp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- References

No definition available.

+ Details

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Namespace Prefix:	arlp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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
-SubTopic 10
-Name Accounting Standards Codification
-Section 35
-Paragraph 4
-Publisher FASB
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482017/420-10-50-1

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Balance Type:	debit
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- References

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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
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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Balance Type:	debit
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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
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Data Type:	dtr-types:percentItemType
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Period Type:	duration

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
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-Publisher FASB
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