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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Advance Royalties (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Advance Royalties |  |
Advance royalties, net, affiliates | $ 48,389 | $ 41,216
Advance royalties, net, third-parties | 12,570 | 12,685
Total advance royalties, net | $ 60,959 | $ 53,901

X
- 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
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X
- Definition Carrying amount as of the balance sheet date of capitalized amounts paid to affiliates 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

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

X
- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration