Name:	arlp_LettersOfCreditToSecureWorkersCompensationObligation
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

No definition available.

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

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

No definition available.

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

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

No definition available.

Name:	arlp_WorkersCompensationLiabilityAccruals
Namespace Prefix:	arlp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- References

No definition available.

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

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.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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Name:	us-gaap_AccretionExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

Name:	us-gaap_FairValueInputsQuantitativeInformationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Name:	us-gaap_InsuranceSettlementsReceivableNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

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-Name Accounting Standards Codification
-Topic 944
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Name:	us-gaap_WorkersCompensationDiscountPercent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

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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