SEGMENT REPORTING - Reconciliation of Segment Profit to Net Income Attributable to Stockholders (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting [Abstract]
Total segments’ profit									$ 270,215	$ 246,054	$ 223,454
General and administrative									(32,143)	(29,879)	(26,581)
Depreciation and amortization									(123,338)	(116,306)	(108,292)
Interest expense									(58,232)	(58,587)	(53,440)
Loss on early extinguishment of debt									0	(4,271)	0
Other (expense) income, net									(625)	(418)	447
Net income	$ 12,406	$ 16,369	$ 13,588	$ 13,514	$ 10,478	$ 12,895	$ 11,487	$ 1,733	55,877	36,593	35,588
Net income attributable to restricted shares	(184)	(155)	(154)	(155)	(147)	(145)	(135)	(137)	(648)	(564)	(383)
Net income attributable to unitholders in the Operating Partnership	$ (2,593)	$ (3,442)	$ (2,852)	$ (2,836)	$ (2,194)	$ (2,709)	$ (2,411)	$ (339)	(11,723)	(7,653)	(7,545)
NET INCOME ATTRIBUTABLE TO AMERICAN ASSETS TRUST, INC. STOCKHOLDERS									$ 43,506	$ 28,376	$ 27,660