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EMPLOYEE BENEFIT PLANS - Assumptions (Details) - Defined benefit pension plan	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Asset allocation assumptions
Asset allocation assumption	100.00%
Actual return on plan assets (as a percent)	12.50%	(14.60%)
Equity securities
Asset allocation assumptions
Asset allocation assumption	75.00%
Fixed income securities
Asset allocation assumptions
Asset allocation assumption	25.00%

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- Definition

Defined benefit plan asset allocation assumption.

+ References

No definition available.

+ Details

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Namespace Prefix:	arlp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

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- Definition

Represents the actual rate of earnings on the funds invested to provide for the benefits included in the benefit obligation.

+ References

No definition available.

+ Details

Name:	arlp_DefinedBenefitPlansActualReturnOnPlanAssets
Namespace Prefix:	arlp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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

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- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DefinedBenefitPlanEquitySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_FixedIncomeSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: