PARTNERS' CAPITAL OF AMERICAN ASSETS TRUST, L.P. (Details)	12 Months Ended
	Dec. 31, 2023 shares
American Assets Trust, L.P.
Capital Unit [Line Items]
Ownership percent by parent	78.80%
American Assets Trust, L.P.
Capital Unit [Line Items]
Non-controlling common units (in shares)	16,181,537
American Assets Trust, L.P. | Common Shares
Capital Unit [Line Items]
Redemption ratio	1
Non-Affiliated Investors | American Assets Trust, L.P.
Capital Unit [Line Items]
Percentage of ownership interests classified as noncontrolling	21.20%