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COMMITMENTS AND CONTINGENCIES - Insurance (Details) - Property and casualty insurance $ in Millions | Oct. 01, 2020 USD ($)
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Commitments And Contingencies |
Aggregate maximum insurance limit | $ 100.0
Insurance deductible | $ 1.5
Waiting period one | 75 days
Waiting period | 90 days
Overall aggregate deductible | $ 10.0
Percentage of participating interest in commercial property insurance program | 10.00%

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- Definition Represents the aggregate maximum limit per occurrence under the commercial property insurance held by the entity. + References No definition available. + Details
Name: | arlp_AggregateMaximumInsuranceLimit
Namespace Prefix: | arlp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the deductible for property damage under the commercial property insurance held by the entity. + References No definition available. + Details
Name: | arlp_InsuranceDeductible
Namespace Prefix: | arlp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the waiting period for underground business interruptions under the commercial property insurance held by the entity. + References No definition available. + Details
Name: | arlp_InsuranceWaitingPeriod
Namespace Prefix: | arlp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition First possible waiting period, depending on the mining complex, for underground business interruptions under the commercial property insurance held by the entity. + References No definition available. + Details
Name: | arlp_InsuranceWaitingPeriodOne
Namespace Prefix: | arlp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the overall aggregate deductible under the commercial property insurance held by the entity. + References No definition available. + Details
Name: | arlp_OverallAggregateDeductible
Namespace Prefix: | arlp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of participating interest in commercial property insurance program. + References No definition available. + Details
Name: | arlp_PercentageOfParticipatingInterestInCommercialPropertyInsuranceProgram
Namespace Prefix: | arlp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_UninsuredRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |