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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Advance Royalties (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Advance Royalties
Advance royalties, affiliates	$ 64,599	$ 60,608
Advance royalties, third-parties	14,306	14,661
Total advance royalties, net	$ 78,905	$ 75,269

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- Definition

Carrying amount as of the balance sheet date of capitalized amounts paid for coal mineral royalties.

+ References

No definition available.

+ Details

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Namespace Prefix:	arlp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Carrying amount as of the balance sheet date of capitalized amounts paid to affiliates for coal mineral royalties.

+ References

No definition available.

+ Details

Name:	arlp_PrepaidMineralRoyaltiesCurrentAndNoncurrentAffiliates
Namespace Prefix:	arlp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Carrying amount as of the balance sheet date of capitalized amounts paid to third parties for coal mineral royalties.

+ References

No definition available.

+ Details

Name:	arlp_PrepaidMineralRoyaltiesCurrentAndNoncurrentThirdParties
Namespace Prefix:	arlp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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