XML 136 R111.htm IDEA: XBRL DOCUMENT v3.20.4

RELATED-PARTY TRANSACTIONS - Affiliate Royalty Agreements - SGP (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Tunnel Ridge
Related Party Transaction
Payments for earned royalties	$ 6.1	$ 7.2	$ 6.0
Tunnel Ridge | Joseph W Craft III Foundation | Tunnel Ridge
Related Party Transaction
Property ownership (as a percent)	0.50%
SGP | Tunnel Ridge
Related Party Transaction
Annual minimum royalties	$ 3.0

X

- Definition

The minimum amount of royalties to be paid annually to the related party, per the terms of the agreement.

+ References

No definition available.

+ Details

Name:	arlp_AnnualMinimumRoyalties
Namespace Prefix:	arlp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the property ownership, as a percent.

+ References

No definition available.

+ Details

Name:	arlp_PropertyOwnershipPercent
Namespace Prefix:	arlp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The amount of cash paid for royalties during the current period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585

+ Details

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

X

- Details

Name:	srt_OwnershipAxis=arlp_TunnelRidgeLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	dei_LegalEntityAxis=arlp_JosephWCraftIiiFoundationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=arlp_SpecialGeneralPartnerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: