PARTNERS CAPITAL OF AMERICAN ASSETS TRUST, L.P. (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Operating Partnership Units
Capital Unit [Line Items]
Antidilutive securities excluded from computation of EPS	171,743	176,676	172,669	211,526
American Assets Trust, L.P.
Capital Unit [Line Items]
Noncontrolling common units	17,899,516		17,899,516
Percentage of ownership interests classified as noncontrolling	28.30%		28.30%
American Assets Trust, L.P. | Operating Partnership Units
Capital Unit [Line Items]
Antidilutive securities excluded from computation of EPS	171,743	176,767	172,669	211,526