XML 39 R72.htm IDEA: XBRL DOCUMENT
v3.20.1

SUBSEQUENT EVENTS (Details) - Subsequent event | Apr. 15, 2020 employee
--- | ---
Gibson County mining complex |
Subsequent Event |
Number of employees terminated | 116
Hamilton mining complex |
Subsequent Event |
Number of employees terminated | 78

X
- Definition Number of employees terminated. + References No definition available. + Details
Name: | arlp_NumberOfEmployeesTerminated
Namespace Prefix: | arlp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=arlp_GibsonCountyMiningMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=arlp_HamiltonCountyIllinoisReserveAcquisitionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |