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QUARTERLY FINANCIAL INFORMATION (UNAUDITED) - Selected Quarterly Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Quarterly Financial Information [Line Items]                      
Revenues $ 112,491 $ 111,198 $ 109,721 $ 107,754 $ 106,000 $ 111,023 $ 104,155 $ 101,470 $ 441,164 $ 422,648 $ 375,828
Operating income (loss) 29,399 31,139 31,492 29,716 27,073 31,003 28,316 28,342 121,747 114,734 99,869
Net income 13,492 15,135 15,397 20,666 12,406 16,369 13,588 13,514 64,690 55,877 36,593
Net income attributable to restricted shares (193) (189) (190) (189) (184) (155) (154) (155) (761) (648) (564)
Net income attributable to unitholders in the Operating Partnership (2,818) (3,168) (3,224) (4,341) (2,593) (3,442) (2,852) (2,836) $ (13,551) $ (11,723) $ (7,653)
Net income attributable to American Assets Trust, Inc. stockholders $ 10,481 $ 11,778 $ 11,983 $ 16,136 $ 9,629 $ 12,772 $ 10,582 $ 10,523      
Net income per share attributable to common stockholders - basic (in USD per share) $ 0.17 $ 0.20 $ 0.20 $ 0.27 $ 0.16 $ 0.21 $ 0.18 $ 0.18 $ 0.84 $ 0.72 $ 0.47
Net income per share attributable to common stockholders - diluted (in USD per share) $ 0.17 $ 0.20 $ 0.20 $ 0.27 $ 0.16 $ 0.21 $ 0.18 $ 0.18 $ 0.84 $ 0.72 $ 0.47
American Assets Trust, L.P.                      
Quarterly Financial Information [Line Items]                      
Revenues $ 112,491 $ 111,198 $ 109,721 $ 107,754 $ 106,000 $ 111,023 $ 104,155 $ 101,470 $ 441,164 $ 422,648 $ 375,828
Operating income (loss) 29,399 31,139 31,492 29,716 27,073 31,003 28,316 28,342 121,747 114,734 99,869
Net income 13,492 15,135 15,397 20,666 12,406 16,369 13,588 13,514 64,690 55,877 36,593
Net income attributable to restricted shares (193) (189) (190) (189) (184) (155) (154) (155) $ (761) $ (648) $ (564)
Net income attributable to American Assets Trust, L.P. unit holders $ 13,299 $ 14,946 $ 15,207 $ 20,477 $ 12,222 $ 16,214 $ 13,434 $ 13,359      
Net income per share attributable to common stockholders - basic (in USD per share) $ 0.17 $ 0.20 $ 0.20 $ 0.27 $ 0.16 $ 0.21 $ 0.18 $ 0.18 $ 0.84 $ 0.72 $ 0.47
Net income per share attributable to common stockholders - diluted (in USD per share) $ 0.17 $ 0.20 $ 0.20 $ 0.27 $ 0.16 $ 0.21 $ 0.18 $ 0.18 $ 0.84 $ 0.72 $ 0.47