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Quarterly Financial Information (Unaudited) Selected Quarterly Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information [Line Items]                        
Total revenue $ 81,746 $ 82,339 $ 77,106 $ 73,792 $ 76,562 $ 75,976 $ 71,819 $ 70,731 $ 12,650 $ 314,983 $ 295,088 $ 275,623
Operating income (loss) 23,792 26,477 20,048 23,329 25,110 25,484 23,704 23,643 (3,670) 93,646 97,941 94,151
Net income 9,731 12,505 7,588 10,308 12,408 11,858 10,650 10,721 $ (3,670) 40,132 45,637 53,915
Net income attributable to restricted shares (60) (60) (61) (60) (61) (42) (43) (43)   (241) (189) (168)
Net income attributable to unitholders in the Operating Partnership (2,594) (3,351) (2,008) (2,861) (3,486) (3,342) (3,008) (3,027)   (10,814) (12,863) (15,238)
Net income attributable to American Assets Trust, L.P. unit holders $ 7,077 $ 9,094 $ 5,519 $ 7,387 $ 8,861 $ 8,474 $ 7,599 $ 7,651   29,077 32,585 38,509
Net income attributable to common stockholders - basic and diluted (in dollars per share) $ 0.15 $ 0.19 $ 0.12 $ 0.16 $ 0.19 $ 0.19 $ 0.17 $ 0.17        
American Assets Trust, L.P.                        
Quarterly Financial Information [Line Items]                        
Total revenue $ 81,746 $ 82,339 $ 77,106 $ 73,792 $ 76,562 $ 75,976 $ 71,819 $ 70,731   314,983 295,088 275,623
Operating income (loss) 23,792 26,477 20,048 23,329 25,110 25,484 23,704 23,643   93,646 97,941 94,151
Net income 9,731 12,505 7,588 10,308 12,408 11,858 10,650 10,721   40,132 45,637 53,915
Net income attributable to restricted shares (60) (60) (61) (60) (61) (42) (43) (43)   (241) (189) (168)
Net income attributable to American Assets Trust, L.P. unit holders                   $ 39,891 $ 45,448 $ 53,747
Net income attributable to American Assets Trust, L.P. unit holders $ 9,671 $ 12,445 $ 7,527 $ 10,248 $ 12,347 $ 11,816 $ 10,607 $ 10,678        
Net income attributable to common stockholders - basic and diluted (in dollars per share) $ 0.15 $ 0.19 $ 0.12 $ 0.16 $ 0.19 $ 0.19 $ 0.17 $ 0.17