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, 2021	Jun. 30, 2021	Mar. 31, 2021
Equity [Abstract]
Dividends period	Third Quarter 2021	Second Quarter 2021	First Quarter 2021
Amount per Share/Unit (in USD per unit)	$ 0.30	$ 0.28	$ 0.28
Date dividend to be paid	Sep. 23, 2021	Jun. 24, 2021	Mar. 25, 2021