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Property and Equipment, Net - Narrative (Details) - Hendry County, Florida $ in Millions | Dec. 31, 2016 USD ($) a
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Property, Plant and Equipment [Line Items] |
Area of land used (in acres) | a | 49
Proceeds from sale of land | $ | $ 2.2

X
- Definition Long Lived Assets Held For Sale, Acres Of Land. + References No definition available. + Details
Name: | alco_LongLivedAssetsHeldForSaleAcresOfLand
Namespace Prefix: | alco_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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

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_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis=alco_HendryCountySugarcanePropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |