EQUITY OF AMERICAN ASSETS TRUST, INC. - Narrative (Details) $ in Thousands		3 Months Ended		9 Months Ended
	Dec. 03, 2021 USD ($) sales_agent	Sep. 30, 2022 USD ($) shares	Sep. 30, 2021 USD ($) shares	Sep. 30, 2022 USD ($) shares	Sep. 30, 2021 USD ($) shares
Equity [Line Items]
Stock-based compensation expense		$ 2,000	$ 1,500	$ 5,491	$ 4,452
Share-based compensation expense not yet recognized		$ 5,200		$ 5,200
Antidilutive securities excluded from computation of EPS (in shares) | shares		483,110	481,966	483,895	485,897
At The Market Equity Program
Equity [Line Items]
Number of sales agents | sales_agent	5
Aggregate offering price of common share	$ 250,000
Remaining capacity to issue		$ 250,000		$ 250,000