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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Advance Royalties (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Advance Royalties
Advance royalties, net, affiliates	$ 41,216	$ 32,645
Advance royalties, net, third-parties	12,685	11,552
Total advance royalties, net	$ 53,901	$ 44,197

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- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

Carrying amount as of the balance sheet date of capitalized amounts paid to third parties for 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

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