DERIVATIVE AND HEDGING ACTIVITIES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Jan. 14, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Reclassified within twelve months	$ 0.4
American Assets Trust, L.P. | Interest Rate Swap | Term Loan A
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fixed interest rate on derivative	2.70%	2.70%
American Assets Trust, L.P. | Interest Rate Swap | Term Loan B | First period
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fixed interest rate on derivative	5.47%
American Assets Trust, L.P. | Interest Rate Swap | Term Loan B | Second period
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fixed interest rate on derivative	5.57%
American Assets Trust, L.P. | Interest Rate Swap | Term Loan C | First period
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fixed interest rate on derivative	5.57%
American Assets Trust, L.P. | Interest Rate Swap | Term Loan C | Second period
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fixed interest rate on derivative	5.47%
American Assets Trust, L.P. | Forward Contracts | Series D Notes
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fixed interest rate on derivative	3.87%
American Assets Trust, L.P. | Forward Contracts | Series E Notes
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fixed interest rate on derivative	4.18%
American Assets Trust, L.P. | Forward Contracts | Series F Notes
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fixed interest rate on derivative	3.85%
American Assets Trust, L.P. | Forward Contracts | Series G Notes
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fixed interest rate on derivative	3.88%