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Investments in Affiliates (Details) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended 1 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2014
Unit
Oct. 31, 2014
Unit
Jan. 31, 2015
Unit
Jul. 31, 2014
Sep. 24, 2013
Dec. 31, 2010
Unit
Schedule of Equity Method Investments [Line Items]                            
Undistributed earnings of investments in affiliates $ 1,900,000us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees       $ 1,900,000us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees       1,900,000us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees          
Dividends and distributions from unconsolidated affiliates         17,900,000us-gaap_EquityMethodInvestmentDividendsOrDistributions 6,600,000us-gaap_EquityMethodInvestmentDividendsOrDistributions 2,900,000us-gaap_EquityMethodInvestmentDividendsOrDistributions              
Investments in Affiliates 418,600,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures       418,600,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures 341,400,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures     418,600,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures          
Proceeds from sale of real estates         53,600,000us-gaap_ProceedsFromSaleOfRealEstate 81,700,000us-gaap_ProceedsFromSaleOfRealEstate 8,400,000us-gaap_ProceedsFromSaleOfRealEstate              
Non-cash reduction in equity method investments (400,000)us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment 15,100,000us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment 0us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment 0us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment 14,700,000us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment 0us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment 0us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment              
Impairment and equity losses         300,000us-gaap_ImpairmentLossesRelatedToRealEstatePartnerships 6,600,000us-gaap_ImpairmentLossesRelatedToRealEstatePartnerships 4,700,000us-gaap_ImpairmentLossesRelatedToRealEstatePartnerships              
Joint Venture with DMB Communities II                            
Schedule of Equity Method Investments [Line Items]                            
Number of high-end residential units 1,500alex_NumberOfHighEndResidentialUnits
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_JointVentureWithDmbCommunitiesIiMember		       1,500alex_NumberOfHighEndResidentialUnits
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_JointVentureWithDmbCommunitiesIiMember		       1,500alex_NumberOfHighEndResidentialUnits
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_JointVentureWithDmbCommunitiesIiMember		          
Capital and value of land contributed, net of joint venture earnings and losses 267,800,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_JointVentureWithDmbCommunitiesIiMember		       267,800,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_JointVentureWithDmbCommunitiesIiMember		       267,800,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_JointVentureWithDmbCommunitiesIiMember		          
Equity method ownership percentage (in percent) 59.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_JointVentureWithDmbCommunitiesIiMember		       59.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_JointVentureWithDmbCommunitiesIiMember		       59.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_JointVentureWithDmbCommunitiesIiMember		          
Kukui'ula Village LLC                            
Schedule of Equity Method Investments [Line Items]                            
Impairment and equity losses           6,300,000us-gaap_ImpairmentLossesRelatedToRealEstatePartnerships
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_KukuiulaVillageLLCMember		                
Santa Barbara (CA) landholdings                            
Schedule of Equity Method Investments [Line Items]                            
Impairment and equity losses               5,100,000us-gaap_ImpairmentLossesRelatedToRealEstatePartnerships
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_SantaBarbaraLandholdingsMember		            
Bakersfield (CA) joint venture                            
Schedule of Equity Method Investments [Line Items]                            
Impairment and equity losses             4,700,000us-gaap_ImpairmentLossesRelatedToRealEstatePartnerships
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_BakersfieldCaJointVentureMember		 4,700,000us-gaap_ImpairmentLossesRelatedToRealEstatePartnerships
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_BakersfieldCaJointVentureMember		            
KRS II                            
Schedule of Equity Method Investments [Line Items]                            
Investment in various real estate joint ventures 8,400,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_KRSIIMember		       8,400,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_KRSIIMember		       8,400,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_KRSIIMember		     23,800,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_KRSIIMember		    
Non-cash reduction in equity method investments         14,700,000us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_KRSIIMember		                  
Fair Value, Measurements, Nonrecurring                            
Schedule of Equity Method Investments [Line Items]                            
Total fair value measurement as of year end             12,900,000us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		              
Impairment and equity losses             9,800,000us-gaap_ImpairmentLossesRelatedToRealEstatePartnerships
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		 9,800,000us-gaap_ImpairmentLossesRelatedToRealEstatePartnerships
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		            
Fair Value, Measurements, Nonrecurring | Santa Barbara (CA) landholdings                            
Schedule of Equity Method Investments [Line Items]                            
Total fair value measurement as of year end             5,900,000us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_SantaBarbaraLandholdingsMember		              
Impairment and equity losses             5,100,000us-gaap_ImpairmentLossesRelatedToRealEstatePartnerships
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_SantaBarbaraLandholdingsMember		              
Fair Value, Measurements, Nonrecurring | Bakersfield (CA) joint venture                            
Schedule of Equity Method Investments [Line Items]                            
Total fair value measurement as of year end             7,000,000us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_BakersfieldCaJointVentureMember		 [1]              
Impairment and equity losses             4,700,000us-gaap_ImpairmentLossesRelatedToRealEstatePartnerships
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_BakersfieldCaJointVentureMember		 [1]              
KDC LLC | Kukui'ula Village LLC                            
Schedule of Equity Method Investments [Line Items]                            
Investment in various real estate joint ventures                         6,300,000us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= alex_KDCLLCMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_KukuiulaVillageLLCMember		  
Payment Guarantee | KRS II                            
Schedule of Equity Method Investments [Line Items]                            
Guarantor obligations, maximum exposure 6,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_PaymentGuaranteeMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_KRSIIMember		       6,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_PaymentGuaranteeMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_KRSIIMember		       6,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_PaymentGuaranteeMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_KRSIIMember		     6,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_PaymentGuaranteeMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_KRSIIMember		    
Condominium                            
Schedule of Equity Method Investments [Line Items]                            
Number of units in real estate property sold                 12alex_NumberofUnitsinRealEstatePropertySold
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OtherPropertyMember		          
Condominium | Waihona High-Rise Condominium                            
Schedule of Equity Method Investments [Line Items]                            
Number of units in real estate property expected for development                           340alex_NumberofUnitsinRealEstatePropertyExpectedforDevelopment
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OtherPropertyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_WaihonaHighRiseCondominiumMember
Investment in various real estate joint ventures 35,600,000us-gaap_EquityMethodInvestments
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OtherPropertyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_WaihonaHighRiseCondominiumMember		       35,600,000us-gaap_EquityMethodInvestments
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OtherPropertyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_WaihonaHighRiseCondominiumMember		 33,400,000us-gaap_EquityMethodInvestments
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OtherPropertyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_WaihonaHighRiseCondominiumMember		     35,600,000us-gaap_EquityMethodInvestments
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OtherPropertyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_WaihonaHighRiseCondominiumMember		          
Condominium | Partners in Joint Venture | Waihona High-Rise Condominium                            
Schedule of Equity Method Investments [Line Items]                            
Total equity required for projects             65,000,000us-gaap_PaymentsToAcquireEquityMethodInvestments
/ dei_LegalEntityAxis
= alex_PartnersinJointVentureMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OtherPropertyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_WaihonaHighRiseCondominiumMember		              
Condominium | Financial Guarantee | Waihona High-Rise Condominium                            
Schedule of Equity Method Investments [Line Items]                            
Guarantor obligations, maximum exposure                           20,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_FinancialGuaranteeMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OtherPropertyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_WaihonaHighRiseCondominiumMember
High-rise Condominium Tower | The Collection LLC                            
Schedule of Equity Method Investments [Line Items]                            
Number of units in real estate property expected for development                   396alex_NumberofUnitsinRealEstatePropertyExpectedforDevelopment
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= alex_HighriseCondominiumTowerMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_TheCollectionLLCMember		        
Townhomes | The Collection LLC                            
Schedule of Equity Method Investments [Line Items]                            
Number of units in real estate property expected for development                   14alex_NumberofUnitsinRealEstatePropertyExpectedforDevelopment
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= alex_TownhomesMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_TheCollectionLLCMember		        
Mid-rise Building | The Collection LLC                            
Schedule of Equity Method Investments [Line Items]                            
Number of units in real estate property expected for development                   54alex_NumberofUnitsinRealEstatePropertyExpectedforDevelopment
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= alex_MidriseBuildingMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_TheCollectionLLCMember		        
Multifamily | The Collection LLC                            
Schedule of Equity Method Investments [Line Items]                            
Number of units in real estate property expected for development                   464alex_NumberofUnitsinRealEstatePropertyExpectedforDevelopment
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= alex_MultifamilyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_TheCollectionLLCMember		        
Investment in various real estate joint ventures 45,900,000us-gaap_EquityMethodInvestments
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= alex_MultifamilyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_TheCollectionLLCMember		       45,900,000us-gaap_EquityMethodInvestments
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= alex_MultifamilyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_TheCollectionLLCMember		       45,900,000us-gaap_EquityMethodInvestments
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= alex_MultifamilyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_TheCollectionLLCMember		          
Payments for Advance to Affiliate                   50,300,000us-gaap_PaymentsForAdvanceToAffiliate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= alex_MultifamilyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_TheCollectionLLCMember		        
Multifamily | Partners in Joint Venture | The Collection LLC                            
Schedule of Equity Method Investments [Line Items]                            
Proceeds from investments in affiliates                   16,800,000alex_ExpectedPaymentstoAcquireEquityMethodInvestment
/ dei_LegalEntityAxis
= alex_PartnersinJointVentureMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= alex_MultifamilyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_TheCollectionLLCMember		        
Multifamily | Financial Guarantee | The Collection LLC                            
Schedule of Equity Method Investments [Line Items]                            
Guarantor obligations, maximum exposure                   $ 30,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_FinancialGuaranteeMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= alex_MultifamilyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_TheCollectionLLCMember		        
Subsequent Event | Condominium                            
Schedule of Equity Method Investments [Line Items]                            
Number of units in real estate property sold                     328alex_NumberofUnitsinRealEstatePropertySold
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_OtherPropertyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
[1] The Total Loss for the Year includes equity in losses of $3.9 million related to the write down of landholdings owned by the joint venture.