XML 22 R1.htm IDEA: XBRL DOCUMENT v3.24.0.1
Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Feb. 14, 2024
Jun. 30, 2023
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity Registrant Name AMERICAN ASSETS TRUST, INC.    
Entity File Number 001-35030    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 27-3338708    
Entity Address, Address Line One 3420 Carmel Mountain Road    
Entity Address, Address Line Two Suite 100    
Entity Address, City or Town San Diego    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 92121    
City Area Code 858    
Local Phone Number 350-2600    
Title of 12(b) Security Common Stock, $.01 par value per share    
Trading Symbol AAT    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 1,012
Entity Common Stock, Shares Outstanding   60,895,786  
Documents Incorporated by Reference
Portions of American Assets Trust, Inc.'s Proxy Statement with respect to its 2024 Annual Meeting of Stockholders to be filed not later than 120 days after the end of its fiscal year are incorporated by reference into Part III hereof.
    
Amendment Flag false    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001500217    
American Assets Trust, L.P.      
Document Information [Line Items]      
Document Type 10-K    
Entity Registrant Name AMERICAN ASSETS TRUST, L.P.    
Entity File Number 33-202342-01    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 27-3338894    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Amendment Flag false    
Entity Central Index Key 0001509570