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EQUITY OF AMERICAN ASSETS TRUST, INC. - ATM Equity Program (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jun. 14, 2019
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Equity [Line Items]        
Proceeds from issuance of common stock $ 472,600   $ 513,934 $ (236)
At The Market Equity Program        
Equity [Line Items]        
Common shares issued (shares)   234,814 916,727  
Weighted average price per share   $ 47.23 $ 45.99  
Proceeds, gross   $ 11,089 $ 42,161  
Proceeds from issuance of common stock   10,920 41,309  
At The Market Equity Program | Sales agent compensation        
Equity [Line Items]        
Sales agent compensation and offering costs   (111) (422)  
At The Market Equity Program | Other offering costs        
Equity [Line Items]        
Sales agent compensation and offering costs   $ (58) $ (430)