Consolidated Statement of Partners' Capital - LP - USD ($) $ in Thousands		Total	Swap	Interest Expense	Gain (loss) on extinguishment of debt	American Assets Trust, L.P.	American Assets Trust, L.P. Swap	American Assets Trust, L.P. Forward Contracts	American Assets Trust, L.P. Interest Expense	American Assets Trust, L.P. Gain (loss) on extinguishment of debt	American Assets Trust, L.P. Accumulated Other Comprehensive Income (Loss)	American Assets Trust, L.P. Accumulated Other Comprehensive Income (Loss) Swap	American Assets Trust, L.P. Accumulated Other Comprehensive Income (Loss) Forward Contracts	American Assets Trust, L.P. Accumulated Other Comprehensive Income (Loss) Interest Expense	American Assets Trust, L.P. Accumulated Other Comprehensive Income (Loss) Gain (loss) on extinguishment of debt	American Assets Trust, L.P. Limited Partner	[1]	American Assets Trust, L.P. General Partner
Beginning balance (in shares) at Dec. 31, 2019																16,390,548		60,068,228	[2]
Beginning balance at Dec. 31, 2019						$ 1,293,672					$ 7,716					$ (22,281)		$ 1,308,237	[2]
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income		$ 35,588				35,588										$ 7,545		$ 28,043	[2]
Conversion of operating partnership units (in shares)																(209,011)		209,011	[2]
Conversion of operating partnership units						0										$ 12,001		$ (12,001)	[2]
Issuance of restricted stock (in shares)	[2]																	317,574
Forfeiture of restricted units (in shares)	[2]																	(95,086)
Distributions						(76,510)										$ (16,285)		$ (60,225)	[2]
Stock-based compensation						6,307												$ 6,307	[2]
Units withheld for employee taxes (in shares)	[2]																	(23,435)
Units withheld for employee taxes		(672)				(672)												$ (672)	[2]
Other comprehensive gain (loss) - unrealized gain (loss) on swap derivatives during the period		(3,649)	$ (3,649)			(3,649)	$ (3,649)					$ (3,649)
Reclassification of amortization of forward-starting swap				$ (1,330)					$ (1,330)					$ (1,330)
Ending balance (in shares) at Dec. 31, 2020																16,181,537		60,476,292	[2]
Ending 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 gain (loss) - unrealized gain (loss) on swap derivatives during the period		2,723	2,723			2,723	2,723	$ (1,098)				2,723	$ (1,098)
Reclassification of amortization of forward-starting swap				(1,098)	$ (193)				(1,098)	$ (193)					$ (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 gain (loss) - unrealized gain (loss) on swap derivatives during the period		$ 11,319	$ 11,319			11,319	$ 11,319					$ 11,319
Reclassification of amortization of forward-starting swap				$ (1,477)					$ (1,477)					$ (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]

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

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