EQUITY OF AMERICAN ASSETS TRUST, INC. - Dividends Declare and Paid on Shares on Common Stock and Noncontrolling Common Units (Details) - $ / shares	3 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015
Equity [Abstract]
Dividends period	Third Quarter 2015	Second Quarter 2015	First Quarter 2015
Amount per Share/Unit (in USD per unit)	$ 0.2325	$ 0.2325	$ 0.2325
Date dividend to be paid	Sep. 25, 2015	Jun. 26, 2015	Mar. 27, 2015