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v3.20.4

PARTNERS' CAPITAL - Distributions (Details) - $ / shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2020
PARTNERS' CAPITAL |  |  |  |  |  |  |  |  |  |
Period following quarter end for distribution of available cash |  |  |  |  |  |  |  |  |  | 45 days
Quarterly distribution paid (in dollars per unit) | $ 0.400 | $ 0.540 | $ 0.540 | $ 0.535 | $ 0.530 | $ 0.525 | $ 0.520 | $ 0.515 | $ 0.510 |

X
- Definition Per unit of ownership amount of cash distributions paid to unit-holder of a limited partnership (LP). + References No definition available. + Details
Name: | arlp_DistributionMadeDistributionsPaidPerUnit
Namespace Prefix: | arlp_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period following each quarter end within which cash distributions are made to the members or limited partners of an LLC or LP. + References No definition available. + Details
Name: | arlp_DistributionsMadeToMemberOrLimitedPartnerPeriodForDistribution
Namespace Prefix: | arlp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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