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, 2017	Jun. 30, 2017	Mar. 31, 2017
Equity [Abstract]
Dividends period	Third Quarter 2017	Second Quarter 2017	First Quarter 2017
Amount per Share/Unit (in USD per unit)	$ 0.26	$ 0.26	$ 0.26
Date dividend to be paid	Sep. 28, 2017	Jun. 29, 2017	Mar. 30, 2017