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EMPLOYEE BENEFIT PLANS, Contributions and Cash Balance Pension Plan (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2010
Pension Benefits [Member] |
Contributions [Abstract] |
Pension contributions | $ 6
Cash Balance Defined Benefit Pension Plan [Member] |
Cash balance defined benefit pension plan [Abstract] |
Description of interest credit rate basis | ten-year U.S. Treasury rate
Service period for vesting (in years) | 3Y

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- Details
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Balance Type: | na
Period Type: | duration

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- Definition A description of the basis on which the plan interest credit rate will vary from year-to-year. + References No definition available. + Details
Name: | alex_DescriptionOfInterestCreditRateBasis
Namespace Prefix: | alex_
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- Definition The service period (in years) over which employees are fully vested. + References No definition available. + Details
Name: | alex_PlanServicePeriodForVesting
Namespace Prefix: | alex_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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- Definition The amount of cash or cash equivalents contributed by the entity to fund its pension plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585 + Details
Name: | us-gaap_PensionContributions
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration