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SUBSEQUENT EVENT (Details) (Holding Company Merger [Member]) | Feb. 13, 2012
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Holding Company Merger [Member] |
Subsequent Event [Line Items] |
Maximum permitted percentage of common stock of the holding company that may be owned (in hundredths) | 22.00%

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- Definition The maximum permitted percentage of outstanding shares of common stock in the holding company that may be owned (of record or beneficially) or controlled in the aggregate by non-U.S. citizens (as defined by the Jones Act). + References No definition available. + Details
Name: | alex_MaximumPermittedPercentageOfCommonStockOfHoldingCompanyThatMayBeOwned
Namespace Prefix: | alex_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration