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DEBT - Summary of Total Secured Notes Payable Outstanding (Details) (American Assets Trust, L.P., USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Shops At Kalakaua
    
Debt Instrument [Line Items]    
Stated Interest Rate 0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= aat_ShopsAtKalakauaMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member		 [1],[2]  
Stated Maturity Date May 01, 2015 [1],[2]  
The Land Mark at One Market
    
Debt Instrument [Line Items]    
Stated Interest Rate 5.61%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= aat_LandMarkAtOneMarketMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member		 [1],[3]  
Stated Maturity Date Jul. 05, 2015 [1],[3]  
Del Monte Center
    
Debt Instrument [Line Items]    
Stated Interest Rate 0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= aat_DelMonteCenterMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member		 [1],[4]  
Stated Maturity Date Jul. 08, 2015 [1],[4]  
First And Main
    
Debt Instrument [Line Items]    
Stated Interest Rate 3.97%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= aat_FirstAndMainMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member		 [1]  
Stated Maturity Date Jul. 01, 2016 [1]  
Imperial Beach Gardens
    
Debt Instrument [Line Items]    
Stated Interest Rate 6.16%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= aat_ImperialBeachGardensMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member		 [1]  
Stated Maturity Date Sep. 01, 2016 [1]  
Mariners Point
    
Debt Instrument [Line Items]    
Stated Interest Rate 6.09%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= aat_MarinersPointMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member		 [1]  
Stated Maturity Date Sep. 01, 2016 [1]  
South Bay Marketplace
    
Debt Instrument [Line Items]    
Stated Interest Rate 5.48%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= aat_SouthBayMarketplaceMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member		 [1]  
Stated Maturity Date Feb. 10, 2017 [1]  
Waikiki Beach Walk - Retail
    
Debt Instrument [Line Items]    
Stated Interest Rate 5.39%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= aat_WaikikiBeachWalkRetailMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member		 [1]  
Stated Maturity Date Jul. 01, 2017 [1]  
Solana Beach Corporate Centre Three To Four
    
Debt Instrument [Line Items]    
Stated Interest Rate 6.39%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= aat_SolanaBeachCorporateCentreThreeToFourMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member		 [5]  
Stated Maturity Date Aug. 01, 2017 [5]  
Loma Palisades
    
Debt Instrument [Line Items]    
Stated Interest Rate 6.09%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= aat_LomaPalisadesMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member		 [1]  
Stated Maturity Date Jul. 01, 2018 [1]  
One Beach Street
    
Debt Instrument [Line Items]    
Stated Interest Rate 3.94%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= aat_OneBeachStreetMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member		 [1]  
Stated Maturity Date Apr. 01, 2019 [1]  
Torrey Reserve North Court
    
Debt Instrument [Line Items]    
Stated Interest Rate 7.22%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= aat_TorreyReserveNorthCourtMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member		 [5]  
Stated Maturity Date Jun. 01, 2019 [5]  
Torrey Reserve
    
Debt Instrument [Line Items]    
Stated Interest Rate 6.36%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= aat_TorreyReserveMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member		 [5]  
Stated Maturity Date Jun. 01, 2020 [5]  
Solana Beach Corporate Centre One To Two
    
Debt Instrument [Line Items]    
Stated Interest Rate 5.91%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= aat_SolanaBeachCorporateCentreOneToTwoMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member		 [5]  
Stated Maturity Date Jun. 01, 2020 [5]  
Solana Beach Towne Centre
    
Debt Instrument [Line Items]    
Stated Interest Rate 5.91%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= aat_SolanaBeachTowneCentreMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member		 [5]  
Stated Maturity Date Jun. 01, 2020 [5]  
City Center Bellevue
    
Debt Instrument [Line Items]    
Stated Interest Rate 3.98%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= aat_CityCenterBellevueMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member		 [1]  
Stated Maturity Date Nov. 01, 2022 [1]  
Secured Debt
    
Debt Instrument [Line Items]    
Total $ 718,253aat_GrossSecuredDebt
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 $ 819,983aat_GrossSecuredDebt
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Unamortized fair value adjustment (6,444)us-gaap_DebtInstrumentUnamortizedDiscount
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 (7,172)us-gaap_DebtInstrumentUnamortizedDiscount
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Total Debt Outstanding 711,809us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 812,811us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Period of amortization schedule (in years) 30 years  
Secured Debt | Shops At Kalakaua
    
Debt Instrument [Line Items]    
Secured notes payable, Principal Balance 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_ShopsAtKalakauaMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [1],[2] 19,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_ShopsAtKalakauaMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [1],[2]
Secured Debt | The Land Mark at One Market
    
Debt Instrument [Line Items]    
Secured notes payable, Principal Balance 133,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_LandMarkAtOneMarketMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [1],[3] 133,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_LandMarkAtOneMarketMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [1],[3]
Secured Debt | Del Monte Center
    
Debt Instrument [Line Items]    
Secured notes payable, Principal Balance 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_DelMonteCenterMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [1],[4] 82,300us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_DelMonteCenterMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [1],[4]
Secured Debt | First And Main
    
Debt Instrument [Line Items]    
Secured notes payable, Principal Balance 84,500us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_FirstAndMainMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [1] 84,500us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_FirstAndMainMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [1]
Secured Debt | Imperial Beach Gardens
    
Debt Instrument [Line Items]    
Secured notes payable, Principal Balance 20,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_ImperialBeachGardensMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [1] 20,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_ImperialBeachGardensMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [1]
Secured Debt | Mariners Point
    
Debt Instrument [Line Items]    
Secured notes payable, Principal Balance 7,700us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_MarinersPointMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [1] 7,700us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_MarinersPointMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [1]
Secured Debt | South Bay Marketplace
    
Debt Instrument [Line Items]    
Secured notes payable, Principal Balance 23,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_SouthBayMarketplaceMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [1] 23,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_SouthBayMarketplaceMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [1]
Secured Debt | Waikiki Beach Walk - Retail
    
Debt Instrument [Line Items]    
Secured notes payable, Principal Balance 130,310us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_WaikikiBeachWalkRetailMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [1] 130,310us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_WaikikiBeachWalkRetailMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [1]
Secured Debt | Solana Beach Corporate Centre Three To Four
    
Debt Instrument [Line Items]    
Secured notes payable, Principal Balance 36,257us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_SolanaBeachCorporateCentreThreeToFourMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [5] 36,376us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_SolanaBeachCorporateCentreThreeToFourMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [5]
Secured Debt | Loma Palisades
    
Debt Instrument [Line Items]    
Secured notes payable, Principal Balance 73,744us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_LomaPalisadesMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [1] 73,744us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_LomaPalisadesMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [1]
Secured Debt | One Beach Street
    
Debt Instrument [Line Items]    
Secured notes payable, Principal Balance 21,900us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_OneBeachStreetMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [1] 21,900us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_OneBeachStreetMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [1]
Secured Debt | Torrey Reserve North Court
    
Debt Instrument [Line Items]    
Secured notes payable, Principal Balance 20,995us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_TorreyReserveNorthCourtMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [5] 21,075us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_TorreyReserveNorthCourtMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [5]
Secured Debt | Torrey Reserve
    
Debt Instrument [Line Items]    
Secured notes payable, Principal Balance 7,074us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_TorreyReserveMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [5] 7,101us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_TorreyReserveMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [5]
Secured Debt | Solana Beach Corporate Centre One To Two
    
Debt Instrument [Line Items]    
Secured notes payable, Principal Balance 11,255us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_SolanaBeachCorporateCentreOneToTwoMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [5] 11,302us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_SolanaBeachCorporateCentreOneToTwoMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [5]
Secured Debt | Solana Beach Towne Centre
    
Debt Instrument [Line Items]    
Secured notes payable, Principal Balance 37,518us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_SolanaBeachTowneCentreMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [5] 37,675us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_SolanaBeachTowneCentreMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [5]
Secured Debt | City Center Bellevue
    
Debt Instrument [Line Items]    
Secured notes payable, Principal Balance $ 111,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_CityCenterBellevueMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [1] $ 111,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= aat_CityCenterBellevueMember
/ dei_LegalEntityAxis
= aat_AmericanAssetsTrustL.P.Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		 [1]
[1] Interest only.
[2] Loan repaid in full, without premium or penalty, on February 2, 201
[3] Loan repaid in full, without premium or penalty, on April 6, 2015
[4] Loan repaid in full, without premium or penalty, on February 6, 2015.
[5] Principal payments based on a 30-year amortization schedule.