EQUITY OF AMERICAN ASSETS TRUST, INC. - Narrative (Details)		3 Months Ended		6 Months Ended
	Dec. 03, 2021 USD ($) salesAgent	Jun. 30, 2022 USD ($) shares	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) shares	Jun. 30, 2021 USD ($) shares
Equity [Line Items]
Stock-based compensation expense		$ 2,000,000	$ 1,500,000	$ 3,490,000	$ 2,968,000
Share-based compensation expense not yet recognized		$ 7,200,000		$ 7,200,000
Antidilutive securities excluded from computation of EPS (in shares) | shares		483,110		484,295	487,895
At The Market Equity Program
Equity [Line Items]
Number of sales agents | salesAgent	5
Aggregate offering price of common share	$ 250,000,000
Remaining capacity to issue		$ 250,000,000		$ 250,000,000