Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

EQUITY OF AMERICAN ASSETS TRUST, INC. - Narrative (Details)		3 Months Ended
	Dec. 03, 2021 USD ($) salesAgent	Mar. 31, 2022 USD ($) shares	Mar. 31, 2021 USD ($) shares
Equity [Line Items]
Noncash compensation expense		$ 1,500,000	$ 1,500,000
American Assets Trust, L.P. \| Operating Partnership Units
Equity [Line Items]
Antidilutive securities excluded from computation of EPS (in shares) \| shares		485,493	489,775
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