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Commitments and Contingencies Current Minimum Annual Payments under Leases (Details) (USD $)
Dec. 31, 2014
Jun. 30, 2016
Feb. 28, 2017
Operating Leased Assets [Line Items]      
2015 $ 2,636,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 2,682,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 2,686,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 2,686,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 2,686,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Thereafter 23,856,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total 37,232,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Scenario, Forecast | The Land Mark at One Market      
Operating Leased Assets [Line Items]      
Stated monthly lease rate   162,140aat_StatedFutureMonthlyLeaseRate
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aat_LandMarkAtOneMarketMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
 
Scenario, Forecast | Waikiki Beach Walk      
Operating Leased Assets [Line Items]      
Stated monthly lease rate     $ 61,690aat_StatedFutureMonthlyLeaseRate
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= aat_WaikikiBeachWalkMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember