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PARTNERS' CAPITAL OF AMERICAN ASSETS TRUST, L.P. (Details)
3 Months Ended
Mar. 31, 2022
shares
Mar. 31, 2021
shares
American Assets Trust, L.P.    
Capital Unit [Line Items]    
Percentage of ownership interests classified as noncontrolling 21.20%  
American Assets Trust, L.P.    
Capital Unit [Line Items]    
Noncontrolling common units (in shares) 16,181,537  
American Assets Trust, L.P. | Operating Partnership Units    
Capital Unit [Line Items]    
Antidilutive securities excluded from computation of EPS (in shares) 485,493 489,775
Limited Partner | American Assets Trust, L.P.    
Capital Unit [Line Items]    
Common unit conversion ratio 1  
Common Shares | American Assets Trust, L.P.    
Capital Unit [Line Items]    
Conversion of operating partnership units (in shares) 0