Consolidated Statement of Partners' Capital (Unaudited) - LP - USD ($) $ in Thousands		Total	Interest Expense	Early Extinguishment of Debt	American Assets Trust, L.P.	American Assets Trust, L.P. Interest Expense	American Assets Trust, L.P. Early Extinguishment of Debt	American Assets Trust, L.P. Accumulated Other Comprehensive Income (Loss)	American Assets Trust, L.P. Accumulated Other Comprehensive Income (Loss) Interest Expense	American Assets Trust, L.P. Accumulated Other Comprehensive Income (Loss) Early Extinguishment of Debt	American Assets Trust, L.P. Limited Partner	[1]	American Assets Trust, L.P. General Partner
Beginning partners' capital account (shares) at Dec. 31, 2020											16,181,537		60,476,292	[2]
Beginning partners' capital account at Dec. 31, 2020					$ 1,253,406			$ 2,737			$ (19,020)		$ 1,269,689	[2]
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income		$ 1,733			1,733						339		$ 1,394	[2]
Forfeiture of restricted units (in shares)	[2]												(4,006)
Distributions					(21,463)						$ (4,531)		$ (16,932)	[2]
Stock-based compensation					1,484								$ 1,484	[2]
Other comprehensive gain - change in value of interest rate swaps		747			747			747
Reclassification of amortization of forward-starting swap realized gain			$ (275)	$ (193)		$ (275)	$ (193)		$ (275)	$ (193)
Ending partners' capital account (shares) at Mar. 31, 2021											16,181,537		60,472,286	[2]
Ending partners' capital account at Mar. 31, 2021					1,235,439			3,016			$ (23,212)		$ 1,255,635	[2]
Beginning partners' capital account (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]
Shares withheld for employee taxes (shares)	[2]												(416)
Shares withheld for employee taxes		(15)			(15)								$ (15)	[2]
Other comprehensive gain - change in value of interest rate swaps		$ 5,596			5,596			5,596
Reclassification of amortization of forward-starting swap realized gain			$ (275)	$ 0		$ (275)	$ 0		$ (275)
Ending partners' capital account (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]

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

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