DEBT - Summary of Total Secured Notes Payable Outstanding (Details) $ in Thousands	Sep. 10, 2024 USD ($)	Jul. 17, 2019 USD ($)	May 11, 2017 USD ($)	Jan. 18, 2017 USD ($)	Mar. 31, 2025 USD ($) interest_rate_swap_agreement	Dec. 31, 2024 USD ($)	Sep. 17, 2024	Sep. 09, 2024 USD ($)
Debt Instrument [Line Items]
Debt discount and issuance costs, net of accumulated amortization of $10,433 and $9,890, respectively					$ (486)	$ (648)
Accumulated amortization					2,105	1,943
American Assets Trust, L.P. \| Treasury Lock
Debt Instrument [Line Items]
Gain on derivatives		$ 500	$ 700	$ 10,400
Notional Amount	$ 150,000							$ 150,000
Loss on derivatives	$ (1,300)
Secured notes payable, net \| American Assets Trust, L.P.
Debt Instrument [Line Items]
Principal Balance as of					75,000	75,000
Debt discount and issuance costs, net of accumulated amortization of $10,433 and $9,890, respectively					(218)	(241)
Total Secured Notes Payable Outstanding					74,782	74,759
Accumulated amortization					655	632
5.08% City Center Bellevue, October 2027 \| Secured notes payable, net \| American Assets Trust, L.P.
Debt Instrument [Line Items]
Principal Balance as of					$ 75,000	$ 75,000
Stated Interest Rate					5.08%
Term Loan A \| American Assets Trust, L.P. \| Interest Rate Swap
Debt Instrument [Line Items]
Number of interest rate agreements \| interest_rate_swap_agreement					2
Fixed interest rate on derivative					2.70%
Term Loan B & Term Loan C \| American Assets Trust, L.P. \| Interest Rate Swap \| First period
Debt Instrument [Line Items]
Fixed interest rate on derivative					5.47%
Term Loan B & Term Loan C \| American Assets Trust, L.P. \| Interest Rate Swap \| Second period
Debt Instrument [Line Items]
Fixed interest rate on derivative					5.57%
Senior Guaranteed Notes, Series D \| American Assets Trust, L.P. \| Treasury Lock
Debt Instrument [Line Items]
Effective interest rate					3.87%
Senior Guaranteed Notes, Series E \| American Assets Trust, L.P. \| Treasury Lock
Debt Instrument [Line Items]
Effective interest rate					4.18%
Senior Guaranteed Notes, Series G \| American Assets Trust, L.P. \| Treasury Lock
Debt Instrument [Line Items]
Effective interest rate					3.88%
6.150% Senior Notes \| American Assets Trust, L.P.
Debt Instrument [Line Items]
Stated Interest Rate							6.15%
6.150% Senior Notes \| American Assets Trust, L.P. \| Treasury Lock
Debt Instrument [Line Items]
Effective interest rate					6.209%

American Assets Trust, Inc. 10-Q