SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Advance Royalties (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Advance Royalties
Advance royalties, affiliates	$ 60,608	$ 55,613
Advance royalties, third-parties	14,661	12,869
Total advance royalties, net	$ 75,269	$ 68,482

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

No definition available.

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