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Notes Payable and Long-Term Debt - Real Estate Secured Term Debt (Details) (USD $)
 12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 20, 2013
Sep. 17, 2013
sqft
Jan. 22, 2013
sqft
Building
Nov. 05, 2013
Dec. 16, 2013
Parcel
Residential_Lot
Dec. 01, 2014
Sep. 24, 2013
Debt Instrument [Line Items]                    
Maturity terms for long-term debts 5 years                  
Repayment of term loan $ 224,200,000us-gaap_RepaymentsOfLongTermDebt $ 380,300,000us-gaap_RepaymentsOfLongTermDebt $ 257,200,000us-gaap_RepaymentsOfLongTermDebt              
Mortgages                    
Debt Instrument [Line Items]                    
Balloon payment to be paid 61,000,000us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		                  
Kaneohe Ranch Portfolio                    
Debt Instrument [Line Items]                    
Fair value of consideration transferred       372,700,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= alex_KaneoheRanchPortfolioMember		            
Kaneohe Ranch Portfolio | Mortgages                    
Debt Instrument [Line Items]                    
Net of debt assumed in business combination       12,000,000alex_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedLongtermDebt
/ us-gaap_BusinessAcquisitionAxis
= alex_KaneoheRanchPortfolioMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		            
Fixed rate on derivative (in percent) 5.95%us-gaap_DerivativeFixedInterestRate
/ us-gaap_BusinessAcquisitionAxis
= alex_KaneoheRanchPortfolioMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		                  
Pearl City                    
Debt Instrument [Line Items]                    
Net of debt assumed in business combination         59,300,000alex_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedLongtermDebt
/ us-gaap_BusinessAcquisitionAxis
= alex_PearlCityMember		          
Area of real estate property         415,400us-gaap_AreaOfRealEstateProperty
/ us-gaap_BusinessAcquisitionAxis
= alex_PearlCityMember		          
Cash consideration         82,200,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= alex_PearlCityMember		          
Bridge Loan | Kaneohe Ranch Portfolio                    
Debt Instrument [Line Items]                    
Face amount of debt       60,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_BusinessAcquisitionAxis
= alex_KaneoheRanchPortfolioMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_BridgeLoanMember		            
LIBOR | Bridge Loan | Kaneohe Ranch Portfolio                    
Debt Instrument [Line Items]                    
LIBOR       LIBOR            
Basis spread on variable rate       3.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_BusinessAcquisitionAxis
= alex_KaneoheRanchPortfolioMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_BridgeLoanMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		            
KDC LLC | Kukui'ula Village LLC                    
Debt Instrument [Line Items]                    
Percentage ownership member in property                   50.00%alex_ConsolidationLessthanWhollyOwnedSubsidiaryParentOwnershipInterestPercentage
/ us-gaap_BusinessAcquisitionAxis
= alex_KukuiulaVillageLLCMember
/ dei_LegalEntityAxis
= alex_KDCLLCMember
Area of real estate property             45us-gaap_AreaOfRealEstateProperty
/ us-gaap_BusinessAcquisitionAxis
= alex_KukuiulaVillageLLCMember
/ dei_LegalEntityAxis
= alex_KDCLLCMember		      
KDC LLC | Kukui'ula Village LLC | Mortgages                    
Debt Instrument [Line Items]                    
Secured debt amount             44,000,000us-gaap_SecuredDebt
/ us-gaap_BusinessAcquisitionAxis
= alex_KukuiulaVillageLLCMember
/ dei_LegalEntityAxis
= alex_KDCLLCMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember		     51,200,000us-gaap_SecuredDebt
/ us-gaap_BusinessAcquisitionAxis
= alex_KukuiulaVillageLLCMember
/ dei_LegalEntityAxis
= alex_KDCLLCMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
Parent Company | Waianae Mall                    
Debt Instrument [Line Items]                    
Net of debt assumed in business combination           19,700,000alex_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedLongtermDebt
/ us-gaap_BusinessAcquisitionAxis
= alex_WaianaeMallMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		        
Number of real estate properties           10us-gaap_NumberOfRealEstateProperties
/ us-gaap_BusinessAcquisitionAxis
= alex_WaianaeMallMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		        
Area of real estate property           170,300us-gaap_AreaOfRealEstateProperty
/ us-gaap_BusinessAcquisitionAxis
= alex_WaianaeMallMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		        
Cash consideration           10,100,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= alex_WaianaeMallMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		        
Loan interest rate (in percent)           5.39%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_BusinessAcquisitionAxis
= alex_WaianaeMallMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		        
Monthly payment of principal and interest           100,000us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_BusinessAcquisitionAxis
= alex_WaianaeMallMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		        
Balloon payment to be paid           18,500,000us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid
/ us-gaap_BusinessAcquisitionAxis
= alex_WaianaeMallMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		        
Percentage of outstanding principal balance Guarantor is reliable for upon default (in percent)           10.00%us-gaap_GuaranteeObligationsLiquidationProceedsPercentage
/ us-gaap_BusinessAcquisitionAxis
= alex_WaianaeMallMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		        
First Mortgage | KDC LLC | Kukui'ula Village LLC | Mortgages                    
Debt Instrument [Line Items]                    
LIBOR             LIBOR      
Maturity terms for long-term debts             3 years      
Secured debt amount 31,100,000us-gaap_SecuredDebt
/ us-gaap_BusinessAcquisitionAxis
= alex_KukuiulaVillageLLCMember
/ dei_LegalEntityAxis
= alex_KDCLLCMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember		           34,600,000us-gaap_SecuredDebt
/ us-gaap_BusinessAcquisitionAxis
= alex_KukuiulaVillageLLCMember
/ dei_LegalEntityAxis
= alex_KDCLLCMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember		     41,800,000us-gaap_SecuredDebt
/ us-gaap_BusinessAcquisitionAxis
= alex_KukuiulaVillageLLCMember
/ dei_LegalEntityAxis
= alex_KDCLLCMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
Area of real estate property                   45us-gaap_AreaOfRealEstateProperty
/ us-gaap_BusinessAcquisitionAxis
= alex_KukuiulaVillageLLCMember
/ dei_LegalEntityAxis
= alex_KDCLLCMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
Repayment of term loan             5,000,000us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= alex_KukuiulaVillageLLCMember
/ dei_LegalEntityAxis
= alex_KDCLLCMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember		      
First Mortgage | KDC LLC | LIBOR | Kukui'ula Village LLC | Mortgages                    
Debt Instrument [Line Items]                    
Basis spread on variable rate             2.85%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_BusinessAcquisitionAxis
= alex_KukuiulaVillageLLCMember
/ dei_LegalEntityAxis
= alex_KDCLLCMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		      
Secured debt amount             9,400,000us-gaap_SecuredDebt
/ us-gaap_BusinessAcquisitionAxis
= alex_KukuiulaVillageLLCMember
/ dei_LegalEntityAxis
= alex_KDCLLCMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		      
Second Mortgage | KDC LLC | Kukui'ula Village LLC | Mortgages                    
Debt Instrument [Line Items]                    
Secured debt amount 9,400,000us-gaap_SecuredDebt
/ us-gaap_BusinessAcquisitionAxis
= alex_KukuiulaVillageLLCMember
/ dei_LegalEntityAxis
= alex_KDCLLCMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_SecondMortgageMember		                 9,400,000us-gaap_SecuredDebt
/ us-gaap_BusinessAcquisitionAxis
= alex_KukuiulaVillageLLCMember
/ dei_LegalEntityAxis
= alex_KDCLLCMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_SecondMortgageMember
Second Mortgage | KDC LLC | LIBOR | Kukui'ula Village LLC | Mortgages                    
Debt Instrument [Line Items]                    
LIBOR             LIBOR      
Basis spread on variable rate             2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_BusinessAcquisitionAxis
= alex_KukuiulaVillageLLCMember
/ dei_LegalEntityAxis
= alex_KDCLLCMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_SecondMortgageMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		      
Required periodic payment of principal             900,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_BusinessAcquisitionAxis
= alex_KukuiulaVillageLLCMember
/ dei_LegalEntityAxis
= alex_KDCLLCMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_SecondMortgageMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		      
Debt periodic principal payment frequency             quarter      
First Hawaiian Bank | Estates of Kahala, LLC | Secured Debt                    
Debt Instrument [Line Items]                    
Non-recourse secured debt 35,200,000us-gaap_NonRecourseDebt
/ dei_LegalEntityAxis
= alex_EstatesofKahalaLLCMember
/ us-gaap_LineOfCreditFacilityAxis
= alex_FirstHawaiianBankMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		             42,000,000us-gaap_NonRecourseDebt
/ dei_LegalEntityAxis
= alex_EstatesofKahalaLLCMember
/ us-gaap_LineOfCreditFacilityAxis
= alex_FirstHawaiianBankMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		    
Number of real estate properties               15us-gaap_NumberOfRealEstateProperties
/ dei_LegalEntityAxis
= alex_EstatesofKahalaLLCMember
/ us-gaap_LineOfCreditFacilityAxis
= alex_FirstHawaiianBankMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		    
Required principal payments, percentage of net sales proceeds from the sale of secured properties               70.00%alex_PrincipalPaymentsPercentageofNetSalesProceedsofProperties
/ dei_LegalEntityAxis
= alex_EstatesofKahalaLLCMember
/ us-gaap_LineOfCreditFacilityAxis
= alex_FirstHawaiianBankMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		    
Minimum cumulative principal payments after 18 months               18,000,000alex_PrincipalPaymentsCumulativeMinimumThreshold
/ dei_LegalEntityAxis
= alex_EstatesofKahalaLLCMember
/ us-gaap_LineOfCreditFacilityAxis
= alex_FirstHawaiianBankMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		    
Maturity terms for long-term debts               18 months    
Maximum cumulative principal payments after 18 months               24,000,000alex_PrincipalPaymentsCumulativeMaximumThreshold
/ dei_LegalEntityAxis
= alex_EstatesofKahalaLLCMember
/ us-gaap_LineOfCreditFacilityAxis
= alex_FirstHawaiianBankMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		    
First Hawaiian Bank | Estates of Kahala, LLC | LIBOR | Secured Debt                    
Debt Instrument [Line Items]                    
LIBOR               LIBOR    
Basis spread on variable rate               2.625%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ dei_LegalEntityAxis
= alex_EstatesofKahalaLLCMember
/ us-gaap_LineOfCreditFacilityAxis
= alex_FirstHawaiianBankMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		    
One-year extension option on debt               1 year    
Maximum | First Hawaiian Bank | Estates of Kahala, LLC | Secured Debt                    
Debt Instrument [Line Items]                    
Maximum percentage of loan to value ratio required to be maintained (in percent)               65.00%alex_DebtCovenantDebttoValueRatio
/ dei_LegalEntityAxis
= alex_EstatesofKahalaLLCMember
/ us-gaap_LineOfCreditFacilityAxis
= alex_FirstHawaiianBankMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Real estate partnership interests                    
Debt Instrument [Line Items]                    
Book values of assets being pledged as collateral 295,200,000us-gaap_DebtInstrumentCollateralAmount
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_RealEstateMember		                  
Materials & Construction                    
Debt Instrument [Line Items]                    
Book values of assets being pledged as collateral 40,200,000us-gaap_DebtInstrumentCollateralAmount
/ us-gaap_StatementBusinessSegmentsAxis
= alex_NaturalMaterialsandConstructionMember		                  
Agribusiness                    
Debt Instrument [Line Items]                    
Book values of assets being pledged as collateral 0us-gaap_DebtInstrumentCollateralAmount
/ us-gaap_StatementBusinessSegmentsAxis
= alex_AgribusinessMember		                  
Revolving Credit Facility | A and B Senior Credit Facility                    
Debt Instrument [Line Items]                    
Revolving credit maximum borrowing capacity 350,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= alex_AndBSeniorCreditFacilityMember		                  
Refinanced Loan, Maturity 2024 | Secured Debt                    
Debt Instrument [Line Items]                    
Face amount of debt                 92,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= alex_RefinancedLoanMaturity2024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		  
Debt periodic principal payment frequency                 monthly  
Loan interest rate (in percent)                 4.15%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= alex_RefinancedLoanMaturity2024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		  
Monthly payment of principal and interest                 400,000us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_DebtInstrumentAxis
= alex_RefinancedLoanMaturity2024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		  
Balloon payment to be paid                 $ 73,000,000us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid
/ us-gaap_DebtInstrumentAxis
= alex_RefinancedLoanMaturity2024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember