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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Information [Line Items]                      
Total revenue $ 71,530 $ 71,289 $ 66,769 $ 66,035 $ 66,478 $ 67,343 $ 62,199 $ 63,980 $ 275,623 $ 260,000 $ 255,057
Operating income (loss) 23,893 23,510 23,504 23,244 22,526 23,036 17,726 20,381 94,151 83,669 81,101
Net income 11,226 19,026 12,284 11,379 10,046 9,090 5,351 6,658 53,915 31,145 22,594
Net income attributable to restricted shares (53) (32) (40) (43) (115) (95) (94) (70) (168) (374) (536)
Net income attributable to unitholders in the Operating Partnership (2,961) (5,432) (3,536) (3,309) (2,907) (2,578) (1,544) (1,986) (15,238) (9,015) (6,838)
Net income attributable to American Assets Trust, L.P. unit holders $ 8,212 $ 13,562 $ 8,708 $ 8,027 $ 7,024 $ 6,417 $ 3,713 $ 4,602 38,509 21,756 15,220
Net income attributable to common stockholders - basic and diluted (in dollars per share) $ 0.18 $ 0.30 $ 0.20 $ 0.18 $ 0.16 $ 0.15 $ 0.09 $ 0.11      
American Assets Trust, L.P.                      
Quarterly Financial Information [Line Items]                      
Total revenue $ 71,530 $ 71,289 $ 66,769 $ 66,035 $ 66,478 $ 67,343 $ 62,199 $ 63,980 275,623 260,000 255,057
Operating income (loss) 23,893 23,510 23,504 23,244 22,526 23,036 17,726 20,381 94,151 83,669 81,101
Net income 11,226 19,026 12,284 11,379 10,046 9,090 5,351 6,658 53,915 31,145 22,594
Net income attributable to restricted shares (53) (32) (40) (43) (115) (95) (94) (70) (168) (374) (536)
Net income attributable to American Assets Trust, L.P. unit holders                 $ 53,747 $ 30,771 $ 22,058
Net income attributable to American Assets Trust, L.P. unit holders $ 11,173 $ 18,994 $ 12,244 $ 11,336 $ 9,931 $ 8,995 $ 5,257 $ 6,588      
Net income attributable to common stockholders - basic and diluted (in dollars per share) $ 0.18 $ 0.30 $ 0.20 $ 0.18 $ 0.16 $ 0.15 $ 0.09 $ 0.11