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Commitments and Contingencies (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Jun. 24, 2014
Boiler
Jul. 31, 2010
Organization
Jun. 30, 2010
Petition
Jun. 25, 2004
Organization
Stream
Aug. 20, 2014
Petition
May 31, 2010
Petition
Sep. 25, 2008
Petition
May 24, 2001
Stream
Jul. 31, 2014
Loss Contingencies [Line Items]                    
Estimated compliance costs for assessing carbon monoxide emissions $ 2,000,000alex_EstimatedComplianceCostsForAssessingCarbonMonoxideEmissions                  
Standby letters of credit                    
Loss Contingencies [Line Items]                    
Commitments and financial arrangements 12,200,000us-gaap_LossContingencyRangeOfPossibleLossMaximum
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_StandbyLettersOfCreditMember
[1]                  
Performance and customs bonds                    
Loss Contingencies [Line Items]                    
Commitments and financial arrangements 329,100,000us-gaap_LossContingencyRangeOfPossibleLossMaximum
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= alex_PerformanceAndCustomsBondsMember
[2]                  
Performance Bond                    
Loss Contingencies [Line Items]                    
Commitments and financial arrangements 305,400,000us-gaap_LossContingencyRangeOfPossibleLossMaximum
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= alex_PerformanceBondMember
                 
Long Term Water Lease Request                    
Loss Contingencies [Line Items]                    
Watershed lands in East Maui owned (in acres) 16,000alex_WatershedLandsInEastMauiOwned
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= alex_LongTermWaterLeaseRequestMember
                 
Number of water licenses held and extended as revocable permits 4alex_NumberOfWaterLicensesHeldAndExtendedAsRevocablePermits
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= alex_LongTermWaterLeaseRequestMember
                 
Additional watershed lands accessible by licenses (in acres) 30,000alex_AdditionalWatershedLandsAccessibleByLicenses
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= alex_LongTermWaterLeaseRequestMember
                 
Capacity of irrigation water supplied by additional watershed lands (in percent) 56.00%alex_CapacityOfIrrigationWaterSuppliedByAdditionalWatershedLands
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= alex_LongTermWaterLeaseRequestMember
                 
Petitions Filed Requesting IIFS In West Maui Streams                    
Loss Contingencies [Line Items]                    
Period provided by irrigation system 10 years                  
Number of streams for which IIFS was requested         4alex_NumberOfStreamsForWhichIifsWasRequested
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= alex_PetitionsFiledRequestingIifsInWestMauiStreamsMember
         
Number of petitions on which the Water Commission took action       2alex_NumberOfPetitionsOnWhichWaterCommissionTookAction
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= alex_PetitionsFiledRequestingIifsInWestMauiStreamsMember
           
Number of organizations that filed a petition to establish IIFS     2alex_NumberOfOrganizationsThatFiledPetitionToEstablishIifs
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= alex_PetitionsFiledRequestingIifsInWestMauiStreamsMember
  2alex_NumberOfOrganizationsThatFiledPetitionToEstablishIifs
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= alex_PetitionsFiledRequestingIifsInWestMauiStreamsMember
         
Approximate percentage of irrigation water provided by the West Maui irrigation system (in percent) 14.00%alex_ApproximatePercentageOfIrrigationWaterProvidedByWestMauiIrrigationSystem
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= alex_PetitionsFiledRequestingIifsInWestMauiStreamsMember
                 
Petitions Filed Requesting IIFS In East Maui Streams                    
Loss Contingencies [Line Items]                    
Number of streams for which IIFS was requested                 27alex_NumberOfStreamsForWhichIifsWasRequested
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= alex_PetitionsFiledRequestingIifsInEastMauiStreamsMember
 
Number of petitions on which the Water Commission took action           27alex_NumberOfPetitionsOnWhichWaterCommissionTookAction
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= alex_PetitionsFiledRequestingIifsInEastMauiStreamsMember
19alex_NumberOfPetitionsOnWhichWaterCommissionTookAction
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= alex_PetitionsFiledRequestingIifsInEastMauiStreamsMember
8alex_NumberOfPetitionsOnWhichWaterCommissionTookAction
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= alex_PetitionsFiledRequestingIifsInEastMauiStreamsMember
   
Hawaii State Department of Health | Unfavorable Regulatory Action                    
Loss Contingencies [Line Items]                    
Number of non-compliant boilers   3alex_LossContingencyNoncompliantBoilersNumber
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_UnfavorableRegulatoryActionMember
/ us-gaap_RegulatoryAgencyAxis
= alex_HawaiiStateDepartmentofHealthMember
               
Loss contingency non-compliant period   5 years                
Estimate of possible loss   1,300,000us-gaap_LossContingencyEstimateOfPossibleLoss
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_UnfavorableRegulatoryActionMember
/ us-gaap_RegulatoryAgencyAxis
= alex_HawaiiStateDepartmentofHealthMember
               
KRS II                    
Loss Contingencies [Line Items]                    
Investment in various real estate joint ventures 8,400,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_KRSIIMember
                23,800,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_KRSIIMember
Indemnification Agreement                    
Loss Contingencies [Line Items]                    
Guarantor obligations, maximum exposure 10,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_IndemnificationGuaranteeMember
                 
Maturity date Aug. 31, 2015                  
Payment Guarantee | KRS II                    
Loss Contingencies [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
[1] Consists of standby letters of credit, issued by the Company’s lenders under the Company’s revolving credit facilities, and relate primarily to the Company’s real estate activities. In the event the letters of credit are drawn upon, the Company would be obligated to reimburse the issuer of the letter of credit. None of the letters of credit has been drawn upon to date, and the Company believes it is unlikely that any of these letters of credit will be drawn upon.
[2] Represents bonds related to construction and real estate activities in Hawaii. Approximately $305.4 million is related to construction bonds issued by third party sureties (bid, performance and payment bonds) and the remainder is related to commercial bonds issued by third party sureties (permit, subdivision, license and notary bonds). In the event the bonds are drawn upon, the Company would be obligated to reimburse the surety that issued the bond. None of the bonds has been drawn upon to date, and the Company believes it is unlikely that any of these bonds will be drawn upon.