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CAPITAL CONSTRUCTION FUND (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010
CAPITAL CONSTRUCTION FUND [Abstract] |  |
Maximum time period to commit fund deposits for qualified purposes (in years) | 25Y |
Period over which deposits will be treated as non-qualified withdrawals (in years) | 5Y |
Accrued withdrawal from the Capital Construction Fund | $ 4.4 | $ 4.4
Accrued deposits to Capital Construction Fund | 4.4 | 4.4
Net balance in the consolidated balance sheets | $ 0 | $ 0

X
- Definition The amount of accrued deposits from certain qualified earnings to the Capital Construction Fund that are reflected as obligations on the consolidated balance sheets. + References No definition available. + Details
Name: | alex_AccruedDepositsToCapitalConstructionFund
Namespace Prefix: | alex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of accrued qualified withdrawals from the Capital Construction Fund that are reflected as receivables on the consolidated balance sheets. + References No definition available. + Details
Name: | alex_AccruedWithdrawalFromCapitalConstructionFund
Namespace Prefix: | alex_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | alex_CapitalConstructionFundAbstract
Namespace Prefix: | alex_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The maximum number of years allowed for CCF fund deposits to remain uncommitted before being treated as non-qualified withdrawals. + References No definition available. + Details
Name: | alex_MaximumTimePeriodToCommitFundDepositsForQualifiedPurposes
Namespace Prefix: | alex_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

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- Definition The net balance of amounts accrued for withdrawal and deposits to the Capital Construction Fund, reflected in the consolidated balance sheets. + References No definition available. + Details
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Namespace Prefix: | alex_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The period (in years) over which deposits not committed for qualified purposes longer than the maximum time period of 25 years from the date of deposit will be treated as non-qualified withdrawals. + References No definition available. + Details
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Period Type: | duration