Consolidated Statement of Partners' Capital (Unaudited) - LP - USD ($) $ in Thousands		Total	American Assets Trust, L.P.	American Assets Trust, L.P. Accumulated Other Comprehensive Income (Loss)	American Assets Trust, L.P. Limited Partners' Capital	[1]	American Assets Trust, L.P. General Partner's Capital
Beginning partners' capital account (in shares) at Dec. 31, 2021					16,181,537		60,525,580	[2]
Beginning partners' capital account at Dec. 31, 2021			$ 1,210,123	$ 4,169	$ (30,138)		$ 1,236,092	[2]
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income		$ 13,514	13,514		2,836		$ 10,678	[2]
Forfeiture of restricted units (in shares)	[2]						(3,121)
Distributions			(24,545)		$ (5,178)		$ (19,367)	[2]
Stock-based compensation			1,489				$ 1,489	[2]
Units withheld for employee taxes (in shares)	[2]						(416)
Units withheld for employee taxes		(15)	(15)				$ (15)	[2]
Other comprehensive income - change in value of interest rate swaps		5,596	5,596	5,596
Reclassification of amortization of forward-starting swap included in interest expense		(275)	(275)	(275)
Ending partners' capital account (in shares) at Mar. 31, 2022					16,181,537		60,522,043	[2]
Ending partners' capital account at Mar. 31, 2022			1,205,887	9,490	$ (32,480)		$ 1,228,877	[2]
Beginning partners' capital account (in shares) at Dec. 31, 2021					16,181,537		60,525,580	[2]
Beginning partners' capital account at Dec. 31, 2021			1,210,123	4,169	$ (30,138)		$ 1,236,092	[2]
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income		43,471	43,471
Other comprehensive income - change in value of interest rate swaps		13,117	13,117
Ending partners' capital account (in shares) at Sep. 30, 2022					16,181,537		60,528,115	[2]
Ending partners' capital account at Sep. 30, 2022			1,197,723	16,461	$ (36,542)		$ 1,217,804	[2]
Beginning partners' capital account (in shares) at Mar. 31, 2022					16,181,537		60,522,043	[2]
Beginning partners' capital account at Mar. 31, 2022			1,205,887	9,490	$ (32,480)		$ 1,228,877	[2]
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income		13,588	13,588		2,852		$ 10,736	[2]
Issuance of restricted units (in shares)	[2]						6,072
Distributions			(24,547)		$ (5,178)		$ (19,369)	[2]
Stock-based compensation			2,001				$ 2,001	[2]
Other comprehensive income - change in value of interest rate swaps		3,314	3,314	3,314
Reclassification of amortization of forward-starting swap included in interest expense		(275)	(275)	(275)
Ending partners' capital account (in shares) at Jun. 30, 2022					16,181,537		60,528,115	[2]
Ending partners' capital account at Jun. 30, 2022			1,199,968	12,529	$ (34,806)		$ 1,222,245	[2]
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income		16,369	16,369		3,442		12,927	[2]
Distributions			(24,547)		$ (5,178)		(19,369)	[2]
Stock-based compensation			2,001				$ 2,001	[2]
Other comprehensive income - change in value of interest rate swaps		4,207	4,207	4,207
Reclassification of amortization of forward-starting swap included in interest expense		(275)	(275)	(275)
Ending partners' capital account (in shares) at Sep. 30, 2022					16,181,537		60,528,115	[2]
Ending partners' capital account at Sep. 30, 2022			1,197,723	16,461	$ (36,542)		$ 1,217,804	[2]
Beginning partners' capital account (in shares) at Dec. 31, 2022					16,181,537		60,718,653	[2]
Beginning partners' capital account at Dec. 31, 2022			1,185,525	14,011	$ (39,127)		$ 1,210,641	[2]
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income		20,666	20,666		4,341		$ 16,325	[2]
Forfeiture of restricted units (in shares)	[2]						(818)
Distributions			(25,377)		$ (5,340)		$ (20,037)	[2]
Stock-based compensation			2,035				$ 2,035	[2]
Other comprehensive income - change in value of interest rate swaps		(2,269)	(2,269)	(2,269)
Reclassification of amortization of forward-starting swap included in interest expense		(854)	(854)	(854)
Ending partners' capital account (in shares) at Mar. 31, 2023					16,181,537		60,717,835	[2]
Ending partners' capital account at Mar. 31, 2023			1,179,726	10,888	$ (40,126)		$ 1,208,964	[2]
Beginning partners' capital account (in shares) at Dec. 31, 2022					16,181,537		60,718,653	[2]
Beginning partners' capital account at Dec. 31, 2022			1,185,525	14,011	$ (39,127)		$ 1,210,641	[2]
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income		51,198	51,198
Other comprehensive income - change in value of interest rate swaps		2,859	2,859
Ending partners' capital account (in shares) at Sep. 30, 2023					16,181,537		60,724,630	[2]
Ending partners' capital account at Sep. 30, 2023			1,168,650	15,819	$ (44,414)		$ 1,197,245	[2]
Beginning partners' capital account (in shares) at Mar. 31, 2023					16,181,537		60,717,835	[2]
Beginning partners' capital account at Mar. 31, 2023			1,179,726	10,888	$ (40,126)		$ 1,208,964	[2]
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income		15,397	15,397		3,224		$ 12,173	[2]
Issuance of restricted units (in shares)	[2]						10,348
Forfeiture of restricted units (in shares)	[2]						(3,553)
Distributions			(25,379)		$ (5,340)		$ (20,039)	[2]
Stock-based compensation			2,110				$ 2,110	[2]
Other comprehensive income - change in value of interest rate swaps		4,360	4,360	4,360
Reclassification of amortization of forward-starting swap included in interest expense		(98)	(98)	(98)
Ending partners' capital account (in shares) at Jun. 30, 2023					16,181,537		60,724,630	[2]
Ending partners' capital account at Jun. 30, 2023			1,176,116	15,150	$ (42,242)		$ 1,203,208	[2]
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income		15,135	15,135		3,168		11,967	[2]
Distributions			(25,379)		$ (5,340)		(20,039)	[2]
Stock-based compensation			2,109				$ 2,109	[2]
Other comprehensive income - change in value of interest rate swaps		768	768	768
Reclassification of amortization of forward-starting swap included in interest expense		$ (99)	(99)	(99)
Ending partners' capital account (in shares) at Sep. 30, 2023					16,181,537		60,724,630	[2]
Ending partners' capital account at Sep. 30, 2023			$ 1,168,650	$ 15,819	$ (44,414)		$ 1,197,245	[2]

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

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