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VARIABLE INTEREST ENTITIES - WKY CoalPlay (Details)	Nov. 17, 2014 company
WKY CoalPlay
Variable Interest Entities
Number of limited liability companies related to MGP, that formed the related party together with SGP Land	2

X

- Definition

The number of limited liability companies owned by irrevocable trusts established by the President and Chief Executive Officer of the partnership's managing general partner, that own the related party together with a subsidiary of the partnership's special general partner.

+ References

No definition available.

+ Details

Name:	arlp_RelatedPartyNumberOfLimitedLiabilityCompaniesAssociatedWithOfficerOfManagingGeneralPartner
Namespace Prefix:	arlp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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_RelatedPartyTransactionsByRelatedPartyAxis=arlp_WkyCoalplayMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: