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Significant Accounting Policies (Details) (USD $)
3 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 26, 2015
Oct. 01, 2013
Jul. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                              
Bank overdrafts $ 3,000,000us-gaap_BankOverdrafts       $ 0us-gaap_BankOverdrafts         $ 3,000,000us-gaap_BankOverdrafts $ 0us-gaap_BankOverdrafts        
Total interest cost incurred                   31,000,000us-gaap_InterestCostsIncurred 20,800,000us-gaap_InterestCostsIncurred 16,800,000us-gaap_InterestCostsIncurred      
Capitalized interest                   1,900,000us-gaap_InterestCostsCapitalized 1,800,000us-gaap_InterestCostsCapitalized 2,000,000us-gaap_InterestCostsCapitalized      
Impairment of real estate assets                 5,100,000us-gaap_ImpairmentOfRealEstate 0us-gaap_ImpairmentOfRealEstate 0us-gaap_ImpairmentOfRealEstate 5,100,000us-gaap_ImpairmentOfRealEstate      
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      
Aggregate intangible asset amortization                   11,200,000us-gaap_AmortizationOfIntangibleAssets 9,300,000us-gaap_AmortizationOfIntangibleAssets 3,300,000us-gaap_AmortizationOfIntangibleAssets      
Goodwill 102,300,000us-gaap_Goodwill       99,600,000us-gaap_Goodwill         102,300,000us-gaap_Goodwill 99,600,000us-gaap_Goodwill 0us-gaap_Goodwill      
Dilutive shares effect of share-based compensation                   600,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 700,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 300,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements      
Securities excluded from the computation of weighted average dilutive shares outstanding                   0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount      
Tax benefit related to equity method investments recognized (6,200,000)us-gaap_IncomeTaxExpenseBenefit 14,900,000us-gaap_IncomeTaxExpenseBenefit (6,500,000)us-gaap_IncomeTaxExpenseBenefit (800,000)us-gaap_IncomeTaxExpenseBenefit (8,500,000)us-gaap_IncomeTaxExpenseBenefit 300,000us-gaap_IncomeTaxExpenseBenefit (2,800,000)us-gaap_IncomeTaxExpenseBenefit (100,000)us-gaap_IncomeTaxExpenseBenefit   1,400,000us-gaap_IncomeTaxExpenseBenefit (11,100,000)us-gaap_IncomeTaxExpenseBenefit 5,900,000us-gaap_IncomeTaxExpenseBenefit      
Carrying Amount                              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                              
Fair value of recorded loan 706,000,000us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
      710,700,000us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
        706,000,000us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
710,700,000us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
       
Fair Value                              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                              
Fair value of recorded loan 729,600,000us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
      723,200,000us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
        729,600,000us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
723,200,000us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
       
Minimum                              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                              
Terms of construction contracts                   1 year          
Maximum                              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                              
Terms of construction contracts                   3 years          
Materials & Construction                              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                              
Accounts receivable and contracts retention 6,000,000us-gaap_ReceivablesNetCurrent
/ us-gaap_StatementBusinessSegmentsAxis
= alex_NaturalMaterialsandConstructionMember
      5,700,000us-gaap_ReceivablesNetCurrent
/ us-gaap_StatementBusinessSegmentsAxis
= alex_NaturalMaterialsandConstructionMember
        6,000,000us-gaap_ReceivablesNetCurrent
/ us-gaap_StatementBusinessSegmentsAxis
= alex_NaturalMaterialsandConstructionMember
5,700,000us-gaap_ReceivablesNetCurrent
/ us-gaap_StatementBusinessSegmentsAxis
= alex_NaturalMaterialsandConstructionMember
       
Accounts and contracts payable 600,000alex_AccountsandContractPayableCurrent
/ us-gaap_StatementBusinessSegmentsAxis
= alex_NaturalMaterialsandConstructionMember
      600,000alex_AccountsandContractPayableCurrent
/ us-gaap_StatementBusinessSegmentsAxis
= alex_NaturalMaterialsandConstructionMember
        600,000alex_AccountsandContractPayableCurrent
/ us-gaap_StatementBusinessSegmentsAxis
= alex_NaturalMaterialsandConstructionMember
600,000alex_AccountsandContractPayableCurrent
/ us-gaap_StatementBusinessSegmentsAxis
= alex_NaturalMaterialsandConstructionMember
       
Goodwill 93,600,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= alex_NaturalMaterialsandConstructionMember
      90,300,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= alex_NaturalMaterialsandConstructionMember
        93,600,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= alex_NaturalMaterialsandConstructionMember
90,300,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= alex_NaturalMaterialsandConstructionMember
0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= alex_NaturalMaterialsandConstructionMember
     
Real Estate Leasing                              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                              
Goodwill 8,700,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= alex_RealEstateLeasingMember
      9,300,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= alex_RealEstateLeasingMember
        8,700,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= alex_RealEstateLeasingMember
9,300,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= alex_RealEstateLeasingMember
0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= alex_RealEstateLeasingMember
     
Grace Pacific Corporation and Shops at Kukui'ula                              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                              
Purchase accounting adjustments to goodwill                   3,300,000us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_BusinessAcquisitionAxis
= alex_GracePacificCorporationandShopsatKukuiulaMember
         
Grace Pacific Corporation                              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                              
Goodwill 93,600,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= alex_GracePacificCorporationMember
                93,600,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= alex_GracePacificCorporationMember
      93,600,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= alex_GracePacificCorporationMember
 
Kukui'ula Village LLC                              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                              
Goodwill         9,300,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= alex_KukuiulaVillageLLCMember
          9,300,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= alex_KukuiulaVillageLLCMember
       
KRS II                              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [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
        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
         
Tax benefit related to equity method investments recognized                   13,700,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_KRSIIMember
         
Bakersfield (CA) joint venture                              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [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
     
Kukui'ula Village LLC                              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                              
Impairment and equity losses                     6,300,000us-gaap_ImpairmentLossesRelatedToRealEstatePartnerships
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= alex_KukuiulaVillageLLCMember
       
Subsequent Event | Performance Shares                              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                              
Restricted Stock Units granted (in shares)                         42,459us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Subsequent Event | Time Based Restricted Stock Units                              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                              
Restricted Stock Units granted (in shares)                         67,087us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= alex_TimeBasedRestrictedStockUnitsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Vesting period                         3 years    
City and County of Honolulu | Customer Concentration Risk | Materials & Construction                              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                              
Revenues         14,300,000us-gaap_Revenues
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= alex_CityandCountyofHonoluluMember
/ us-gaap_StatementBusinessSegmentsAxis
= alex_NaturalMaterialsandConstructionMember
        37,500,000us-gaap_Revenues
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= alex_CityandCountyofHonoluluMember
/ us-gaap_StatementBusinessSegmentsAxis
= alex_NaturalMaterialsandConstructionMember
         
State of Hawaii | Customer Concentration Risk | Materials & Construction                              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                              
Revenues         8,900,000us-gaap_Revenues
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= alex_StateofHawaiiMember
/ us-gaap_StatementBusinessSegmentsAxis
= alex_NaturalMaterialsandConstructionMember
        79,600,000us-gaap_Revenues
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= alex_StateofHawaiiMember
/ us-gaap_StatementBusinessSegmentsAxis
= alex_NaturalMaterialsandConstructionMember
         
C&H Sugar Company, Inc | Customer Concentration Risk | Materials & Construction                              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                              
Revenues                   $ 65,500,000us-gaap_Revenues
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= alex_CHSugarCompanyIncMember
/ us-gaap_StatementBusinessSegmentsAxis
= alex_NaturalMaterialsandConstructionMember
$ 87,600,000us-gaap_Revenues
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= alex_CHSugarCompanyIncMember
/ us-gaap_StatementBusinessSegmentsAxis
= alex_NaturalMaterialsandConstructionMember
$ 117,500,000us-gaap_Revenues
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= alex_CHSugarCompanyIncMember
/ us-gaap_StatementBusinessSegmentsAxis
= alex_NaturalMaterialsandConstructionMember
     
50% cliff vests over 2 years | Subsequent Event | Performance Shares                              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                              
Vesting period                         2 years    
Award vesting rights (in percent)                         50.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheOneMember
   
Performance period                         2 years    
50% cliff vests over 3 years | Subsequent Event | Performance Shares                              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                              
Vesting period                         3 years    
Award vesting rights (in percent)                         50.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheTwoMember
   
Performance period                         3 years    
Investments in Majority-owned Subsidiaries | GPRM Prestress, LLC                              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                              
Ownership interest percentage in subsidiaries 51.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis
= us-gaap_InvestmentsInMajorityOwnedSubsidiariesMember
/ dei_LegalEntityAxis
= alex_GPRMPrestressLLCMember
                51.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis
= us-gaap_InvestmentsInMajorityOwnedSubsidiariesMember
/ dei_LegalEntityAxis
= alex_GPRMPrestressLLCMember
         
Investments in Majority-owned Subsidiaries | GLP Alphalt, LLC                              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                              
Ownership interest percentage in subsidiaries 70.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis
= us-gaap_InvestmentsInMajorityOwnedSubsidiariesMember
/ dei_LegalEntityAxis
= alex_GLPAlphaltLLCMember
                70.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis
= us-gaap_InvestmentsInMajorityOwnedSubsidiariesMember
/ dei_LegalEntityAxis
= alex_GLPAlphaltLLCMember