DEBT - Summary of Total Secured Notes Payable Outstanding (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Debt issuance costs, net	$ (2,268)	$ 0
Debt issuance costs, accumulated amortization	2,394	2,070
American Assets Trust, L.P. | Secured notes payable, net
Debt Instrument [Line Items]
Long-term debt, principal balance	111,000	111,000
Debt issuance costs, net	(14)	(35)
Total Debt Outstanding	110,986	110,965
Debt issuance costs, accumulated amortization	408	387
American Assets Trust, L.P. | City Center Bellevue | Secured notes payable, net
Debt Instrument [Line Items]
Long-term debt, principal balance	$ 111,000	$ 111,000
Stated interest rate	3.98%