Consolidated Statements of Comprehensive Income - LP - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
REVENUE:
Rental income		$ 419,373	$ 402,507	$ 360,208
Other property income		21,791	20,141	15,620
Total revenue		441,164	422,648	375,828
EXPENSES:
Rental expenses		118,801	107,645	86,980
Real estate taxes		45,156	44,788	42,794
General and administrative		35,960	32,143	29,879
Depreciation and amortization		119,500	123,338	116,306
Total operating expenses		319,417	307,914	275,959
OPERATING INCOME		121,747	114,734	99,869
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		64,690	55,877	36,593
Net income attributable to restricted shares		(761)	(648)	(564)
NET INCOME ATTRIBUTABLE TO AMERICAN ASSETS TRUST, INC. STOCKHOLDERS		$ 50,378	$ 43,506	$ 28,376
EARNINGS PER COMMON SHARE, BASIC
Earnings per unit, basic (in USD per share)		$ 0.84	$ 0.72	$ 0.47
Weighted average units outstanding - basic (in shares)		60,158,976	60,048,970	59,990,740
EARNINGS PER COMMON SHARE, DILUTED
Earnings per unit, diluted (in USD per share)		$ 0.84	$ 0.72	$ 0.47
Weighted average units outstanding - diluted (in shares)		76,340,513	76,230,507	76,172,277
COMPREHENSIVE INCOME
Net income		$ 64,690	$ 55,877	$ 36,593
Other comprehensive (loss) income - unrealized (loss) income on swap derivatives during the period		(1,827)	11,319	2,723
Comprehensive income		61,714	65,719	38,025
Comprehensive income attributable to American Assets Trust, Inc.		48,797	51,906	30,059
Forward starting swaps included in interest expense, net
COMPREHENSIVE INCOME
Reclassification of amortization of forward starting swaps		(1,149)	(1,477)	(1,098)
Forward-starting swap realized gain included in loss on early extinguishment of debt
COMPREHENSIVE INCOME
Reclassification of amortization of forward starting swaps		0	0	(193)
American Assets Trust, L.P.
REVENUE:
Rental income		419,373	402,507	360,208
Other property income		21,791	20,141	15,620
Total revenue		441,164	422,648	375,828
EXPENSES:
Rental expenses		118,801	107,645	86,980
Real estate taxes		45,156	44,788	42,794
General and administrative		35,960	32,143	29,879
Depreciation and amortization		119,500	123,338	116,306
Total operating expenses		319,417	307,914	275,959
OPERATING INCOME		121,747	114,734	99,869
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		64,690	55,877	36,593
Net income attributable to restricted shares		(761)	(648)	(564)
NET INCOME ATTRIBUTABLE TO AMERICAN ASSETS TRUST, INC. STOCKHOLDERS		$ 63,929	$ 55,229	$ 36,029
EARNINGS PER COMMON SHARE, BASIC
Earnings per unit, basic (in USD per share)		$ 0.84	$ 0.72	$ 0.47
Weighted average units outstanding - basic (in shares)		76,340,513	76,230,507	76,172,277
EARNINGS PER COMMON SHARE, DILUTED
Earnings per unit, diluted (in USD per share)		$ 0.84	$ 0.72	$ 0.47
Weighted average units outstanding - diluted (in shares)		76,340,513	76,230,507	76,172,277
DISTRIBUTIONS PER UNIT (in dollars per share)		$ 1.32	$ 1.28	$ 1.16
COMPREHENSIVE INCOME
Net income		$ 64,690	$ 55,877	$ 36,593
Other comprehensive (loss) income - unrealized (loss) income on swap derivatives during the period		(1,827)	11,319	2,723
Comprehensive income		61,714	65,719	38,025
American Assets Trust, L.P. | Limited Partners
EXPENSES:
Net income	[1]	13,551	11,723	7,653
COMPREHENSIVE INCOME
Net income	[1]	13,551	11,723	7,653
Comprehensive income attributable to American Assets Trust, Inc.		(12,917)	(13,813)	(7,966)
American Assets Trust, L.P. | General Partner
EXPENSES:
Net income	[2]	51,139	44,154	28,940
COMPREHENSIVE INCOME
Net income	[2]	51,139	44,154	28,940
Comprehensive income attributable to American Assets Trust, Inc.		48,797	51,906	30,059
American Assets Trust, L.P. | Forward starting swaps included in interest expense, net
COMPREHENSIVE INCOME
Reclassification of amortization of forward starting swaps		(1,149)	(1,477)	(1,098)
American Assets Trust, L.P. | Forward-starting swap realized gain included in loss on early extinguishment of debt
COMPREHENSIVE INCOME
Reclassification of amortization of forward starting swaps		$ 0	$ 0	$ (193)

[1] Consists of limited partnership interests held by third parties.

[2] Consists of general and limited partnership interests held by American Assets Trust, Inc.