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COMMITMENTS AND CONTINGENCIES - Insurance (Details) - Property and casualty insurance $ in Millions	Oct. 01, 2020 USD ($)
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%

X

- 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

X

- 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

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- 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.

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No definition available.

+ Details

Name:	arlp_PercentageOfParticipatingInterestInCommercialPropertyInsuranceProgram
Namespace Prefix:	arlp_
Data Type:	dtr-types: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

X

- Details

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