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Fair Value of Financial Instruments (Details) (USD $) In Millions | Jun. 30, 2011 | Dec. 31, 2010
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Fair Value of Financial Instruments [Abstract] |  |
Carrying amount of fixed-rate long-term debt | $ 404 | $ 414
Fair value of fixed-rate long-term debt | $ 433 | $ 438

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- Definition Including current and noncurrent portions, aggregate carrying amount of fixed-rate long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. + Details
Name: | alex_FixedRateLongTermDebt
Namespace Prefix: | alex
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fair value amount of fixed-rate long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + Details
Name: | alex_FixedRateLongTermDebtFairValue
Namespace Prefix: | alex
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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