XML 66 R53.htm IDEA: XBRL DOCUMENT v3.20.2

VARIABLE INTEREST ENTITIES - WKY CoalPlay (Details) - WKY CoalPlay $ in Millions	6 Months Ended
	Jun. 30, 2020 USD ($)
Variable Interest Entities
Payments	$ 10.8
Percentage of internal rate of return on purchase price, if leased reserves acquired	7.00%

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

Percentage of internal rate of return provided to the counterparty in the purchase price under the option to acquire the leased coal reserves.

+ References

No definition available.

+ Details

Name:	arlp_PercentageOfInternalRateOfReturnOnPurchasePriceIfLeasedReservesAcquired
Namespace Prefix:	arlp_
Data Type:	num:percentItemType
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: