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Subsequent Event - Narrative (Details) - Fort Myers Property, Florida - USD ($) $ in Thousands | Aug. 01, 2017 | Mar. 31, 2017
--- | --- | ---
Subsequent Event [Line Items] |  |
Disposal Group, Including Discontinued Operation, Consideration |  | $ 6,000
Subsequent Event |  |
Subsequent Event [Line Items] |  |
Disposal Group, Including Discontinued Operation, Consideration | $ 5,550 |

X
- Definition Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation. + References No definition available. + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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_LongLivedAssetsHeldForSaleByAssetTypeAxis=alco_FortMyersPropertyFloridaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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