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Summary of Significant Accounting Policies (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Segment
Room
Employee
Property
Dec. 31, 2013
Dec. 31, 2012
Jan. 09, 2014
Summary Of Significant Accounting Policies [Line Items]        
Number of employees 113dei_EntityNumberOfEmployees      
Number of office, retail, multifamily and mixed-use operating properties 23us-gaap_NumberOfRealEstateProperties      
Properties held for development 5aat_RealEstatePropertiesHeldForDevelopment      
Allowance for doubtful accounts $ (800,000)us-gaap_AllowanceForDoubtfulAccountsReceivable $ (1,000,000)us-gaap_AllowanceForDoubtfulAccountsReceivable    
Total bad debt expense 200,000us-gaap_ProvisionForDoubtfulAccounts 100,000us-gaap_ProvisionForDoubtfulAccounts 600,000us-gaap_ProvisionForDoubtfulAccounts  
Real estate depreciation expense 56,000,000us-gaap_Depreciation 52,000,000us-gaap_Depreciation 47,800,000us-gaap_Depreciation  
Short term liquid investments, initial maturity 3 months      
Cash balance at banks, federally insured amount   250,000us-gaap_CashFDICInsuredAmount    
Cash balance at banks, excess of FDIC insured limit 32,400,000us-gaap_CashUninsuredAmount 29,000,000us-gaap_CashUninsuredAmount    
Restricted cash 10,994,000us-gaap_RestrictedCashAndCashEquivalents 9,124,000us-gaap_RestrictedCashAndCashEquivalents    
Number of operating segments 4us-gaap_NumberOfOperatingSegments      
Room in mixed-use segment all-suite hotel 369aat_NumberOfRoomsInMixedUseSegmentAllSuiteHotel      
Minimum        
Summary Of Significant Accounting Policies [Line Items]        
Percentage of taxable income required to distribute to qualify as real estate investment trust (REIT) 90.00%aat_PercentageOfDistributedTaxableIncomeToQualifyAsReit
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Money Market Funds        
Summary Of Significant Accounting Policies [Line Items]        
Cash balance at banks, excess of FDIC insured limit 20,000,000us-gaap_CashUninsuredAmount
/ us-gaap_InvestmentTypeAxis
= us-gaap_MoneyMarketFundsMember
11,000,000us-gaap_CashUninsuredAmount
/ us-gaap_InvestmentTypeAxis
= us-gaap_MoneyMarketFundsMember
   
Building And Improvement | Minimum        
Summary Of Significant Accounting Policies [Line Items]        
Real Estate, estimated useful lives 30 years      
Building And Improvement | Maximum        
Summary Of Significant Accounting Policies [Line Items]        
Real Estate, estimated useful lives 40 years      
Furniture And Equipment | Minimum        
Summary Of Significant Accounting Policies [Line Items]        
Real Estate, estimated useful lives 3 years      
Furniture And Equipment | Maximum        
Summary Of Significant Accounting Policies [Line Items]        
Real Estate, estimated useful lives 15 years      
Deferred Rent Receivables        
Summary Of Significant Accounting Policies [Line Items]        
Allowance for doubtful accounts (1,200,000)us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= aat_OtherReceivablesMember
(1,200,000)us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= aat_OtherReceivablesMember
   
Other Income        
Summary Of Significant Accounting Policies [Line Items]        
General excise tax recognized, gross $ 3,400,000us-gaap_ExciseTaxesCollected
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember
$ 3,500,000us-gaap_ExciseTaxesCollected
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember
$ 3,300,000us-gaap_ExciseTaxesCollected
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember
 
Term Loan        
Summary Of Significant Accounting Policies [Line Items]        
Line of credit interest rate (in percents)       3.08%us-gaap_DerivativeSwaptionInterestRate
/ us-gaap_CreditFacilityAxis
= aat_TermLoanMember