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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Advance Royalties (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Advance Royalties
Advance royalties, affiliates	$ 55,613	$ 48,389
Advance royalties, third-parties	12,869	12,570
Total advance royalties, net	$ 68,482	$ 60,959

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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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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

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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 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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