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Description of Business (Details)
 3 Months Ended
Mar. 31, 2015
Segment
Segment Reporting Information [Line Items]  
Number of operating segments 4us-gaap_NumberOfOperatingSegments
Real Estate Development and Sales  
Segment Reporting Information [Line Items]  
Number of operating segments 1us-gaap_NumberOfOperatingSegments
/ us-gaap_StatementBusinessSegmentsAxis
= alex_DevelopmentAndSalesSegmentMember
Real Estate Leasing  
Segment Reporting Information [Line Items]  
Number of operating segments 1us-gaap_NumberOfOperatingSegments
/ us-gaap_StatementBusinessSegmentsAxis
= alex_LeasingSegmentMember
Agribusiness  
Segment Reporting Information [Line Items]  
Number of operating segments 1us-gaap_NumberOfOperatingSegments
/ us-gaap_StatementBusinessSegmentsAxis
= alex_AgribusinessMember
Materials and Construction  
Segment Reporting Information [Line Items]  
Number of operating segments 1us-gaap_NumberOfOperatingSegments
/ us-gaap_StatementBusinessSegmentsAxis
= alex_NaturalMaterialsandConstructionMember