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VARIABLE INTEREST ENTITIES - WKY CoalPlay (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Coal lease
Variable Interest Entities
Payments	$ 13,819	$ 15,317	$ 10,818

X

- Definition

Amount paid during the period for minimum royalty obligations.

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=arlp_CoalLeaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: