SEGMENT REPORTING - Reconciliation of Segment Profit to Net Income Attributable to Stockholders (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting [Abstract]
Total segments’ profit									$ 277,207	$ 270,215	$ 246,054
General and administrative									(35,960)	(32,143)	(29,879)
Depreciation and amortization									(119,500)	(123,338)	(116,306)
Interest expense, net									(64,706)	(58,232)	(58,587)
Loss on early extinguishment of debt									0	0	(4,271)
Other income (expense), net									7,649	(625)	(418)
Net income	$ 13,492	$ 15,135	$ 15,397	$ 20,666	$ 12,406	$ 16,369	$ 13,588	$ 13,514	64,690	55,877	36,593
Net income attributable to restricted shares	(193)	(189)	(190)	(189)	(184)	(155)	(154)	(155)	(761)	(648)	(564)
Net income attributable to unitholders in the Operating Partnership	$ (2,818)	$ (3,168)	$ (3,224)	$ (4,341)	$ (2,593)	$ (3,442)	$ (2,852)	$ (2,836)	(13,551)	(11,723)	(7,653)
NET INCOME ATTRIBUTABLE TO AMERICAN ASSETS TRUST, INC. STOCKHOLDERS									$ 50,378	$ 43,506	$ 28,376