EQUITY OF AMERICAN ASSETS TRUST, INC. - Computation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
NUMERATOR
Net income	$ 15,294	$ 24,623	$ 15,397	$ 20,666	$ 39,917	$ 36,063
Less: Net income attributable to restricted shares	(195)		(190)		(391)	(379)
Less: Income from operations attributable to unitholders in the Operating Partnership	(3,195)		(3,224)		(8,362)	(7,565)
NET INCOME ATTRIBUTABLE TO AMERICAN ASSETS TRUST, INC. STOCKHOLDERS	11,904		11,983		31,164	28,119
Income from operations attributable to American Assets Trust, Inc. common stockholders—basic	11,904		11,983		31,164	28,119
Plus: Income from operations attributable to unitholders in the Operating Partnership	3,195		3,224		8,362	7,565
Net income attributable to common stockholders—diluted	$ 15,099		$ 15,207		$ 39,526	$ 35,684
DENOMINATOR
Weighted average common shares outstanding—basic (in shares)	60,312,878		60,146,210		60,311,399	60,145,414
Effect of dilutive securities-conversion of Operating Partnership units (in shares)	16,181,537		16,181,537		16,181,537	16,181,537
Weighted average common shares outstanding - diluted (in shares)	76,494,415		76,327,747		76,492,936	76,326,951
Earnings per common share, basic (in dollars per share)	$ 0.20		$ 0.20		$ 0.52	$ 0.47
Earnings per common share, diluted (in dollars per share)	$ 0.20		$ 0.20		$ 0.52	$ 0.47