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SUBSEQUENT EVENTS (Details) - Subsequent event $ in Millions	Oct. 13, 2021 USD ($) a
Subsequent Event
Royalty acres, net | a	1,480
Oil & gas royalty acquisition | $	$ 31.0

X

- Definition

Amount of consideration transferred in asset acquisition. Includes, but is not limited to, cash, liability incurred by acquirer, and equity interest issued by acquirer.

+ References

No definition available.

+ Details

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

X

- Definition

The number of net royalty acres acquired.

+ References

No definition available.

+ Details

Name:	arlp_NumberOfRoyaltyAcresAcquiredNet
Namespace Prefix:	arlp_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: