Consolidated Statements of Partners' Capital - LP - USD ($) $ in Thousands		Total	Forward starting swaps included in interest expense, net	Forward-starting swap realized gain included in loss on early extinguishment of debt	American Assets Trust, L.P.	American Assets Trust, L.P. Forward starting swaps included in interest expense, net	American Assets Trust, L.P. Forward-starting swap realized gain included in loss on early extinguishment of debt	American Assets Trust, L.P. Accumulated Other Comprehensive Income (Loss)	American Assets Trust, L.P. Accumulated Other Comprehensive Income (Loss) Forward starting swaps included in interest expense, net	American Assets Trust, L.P. Accumulated Other Comprehensive Income (Loss) Forward-starting swap realized gain included in loss on early extinguishment of debt	American Assets Trust, L.P. Limited Partners	[1]	American Assets Trust, L.P. General Partner
Beginning balance (in shares) at Dec. 31, 2020											16,181,537		60,476,292	[2]
Beginning balance at Dec. 31, 2020					$ 1,253,406			$ 2,737			$ (19,020)		$ 1,269,689	[2]
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income		$ 36,593			36,593						7,653		$ 28,940	[2]
Issuance of restricted stock (in shares)	[2]												229,819
Forfeiture of restricted units (in shares)	[2]												(155,390)
Distributions					(88,936)						$ (18,771)		$ (70,165)	[2]
Stock-based compensation					8,493								$ 8,493	[2]
Units withheld for employee taxes (in shares)	[2]												(25,141)
Units withheld for employee taxes		(865)			(865)								$ (865)	[2]
Other comprehensive income - change in value of interest rate swaps		2,723			2,723			2,723
Reclassification of amortization of forward starting swaps			$ (1,098)	$ (193)		$ (1,098)	$ (193)		$ (1,098)	$ (193)
Ending balance (in shares) at Dec. 31, 2021											16,181,537		60,525,580	[2]
Ending balance at Dec. 31, 2021					1,210,123			4,169			$ (30,138)		$ 1,236,092	[2]
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income		55,877			55,877						11,723		$ 44,154	[2]
Issuance of restricted stock (in shares)	[2]												325,682
Forfeiture of restricted units (in shares)	[2]												(106,796)
Distributions					(98,248)						$ (20,712)		$ (77,536)	[2]
Stock-based compensation					8,690								$ 8,690	[2]
Units withheld for employee taxes (in shares)	[2]												(25,813)
Units withheld for employee taxes		(759)			(759)								$ (759)	[2]
Other comprehensive income - change in value of interest rate swaps		11,319			11,319			11,319
Reclassification of amortization of forward starting swaps			(1,477)	0		(1,477)	0		(1,477)
Ending balance (in shares) at Dec. 31, 2022											16,181,537		60,718,653	[2]
Ending balance at Dec. 31, 2022					1,185,525			14,011			$ (39,127)		$ 1,210,641	[2]
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income		64,690			64,690						13,551		$ 51,139	[2]
Issuance of restricted stock (in shares)	[2]												300,889
Forfeiture of restricted units (in shares)	[2]												(82,481)
Distributions					(101,571)						$ (21,360)		$ (80,211)	[2]
Stock-based compensation					8,838								$ 8,838	[2]
Units withheld for employee taxes (in shares)	[2]												(41,275)
Units withheld for employee taxes		(831)			(831)								$ (831)	[2]
Other comprehensive income - change in value of interest rate swaps		$ (1,827)			(1,827)			(1,827)
Reclassification of amortization of forward starting swaps			$ (1,149)	$ 0		$ (1,149)	$ 0		$ (1,149)
Ending balance (in shares) at Dec. 31, 2023											16,181,537		60,895,786	[2]
Ending balance at Dec. 31, 2023					$ 1,153,675			$ 11,035			$ (46,936)		$ 1,189,576	[2]

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

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