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, 2018	Jun. 30, 2018	Mar. 31, 2018
Equity [Abstract]
Dividends period	Third Quarter 2018	Second Quarter 2018	First Quarter 2018
Amount per Share/Unit (in USD per unit)	$ 0.27	$ 0.27	$ 0.27
Date dividend to be paid	Sep. 27, 2018	Jun. 28, 2018	Mar. 29, 2018