Consolidated Statements Of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenue:
Rental income	$ 199,741	$ 120,749	$ 108,648
Other property income	10,082	3,778	3,938
Total revenue	209,823	124,527	112,586
Expenses:
Rental expenses	59,937	22,150	19,400
Real estate taxes	19,555	12,488	7,950
General and administrative	13,916	8,766	7,023
Depreciation and amortization	57,639	36,356	28,473
Total operating expenses	151,047	79,760	62,846
Operating income	58,776	44,767	49,740
Interest expense	(56,487)	(45,375)	(42,034)
Early extinguishment of debt	(25,867)
Loan transfer and consent fees	(9,019)
Gain on acquisition	46,371	4,297
Other income (expense), net	470	(1,846)	(2,961)
Income from continuing operations	14,244	1,843	4,745
Discontinued operations
Income from discontinued operations	1,099	331	494
Gain on sale of real estate property	3,981
Results from discontinued operations	5,080	331	494
Net income	19,324	2,174	5,239
Net income attributable to restricted shares	(482)
Net loss attributable to Predecessor's noncontrolling interests in consolidated real estate entities	2,458	2,205	1,205
Net income attributable to Predecessor's controlled owners' equity	(16,995)	(4,379)	(6,444)
Net income attributable to unitholders in the Operating Partnership	(1,388)
Net income attributable to American Assets Trust, Inc. stockholders	$ 2,917
Basic net loss from continuing operations attributable to common stockholders per share	$ (0.01)
Basic net income from discontinued operations attributable to common stockholders per share	$ 0.09
Basic net income attributable to common stockholders per share	$ 0.08
Weighted average shares of common stock outstanding-basic	36,748,806
Diluted net loss from continuing operations attributable to common stockholders per share	$ (0.01)
Diluted net income from discontinued operations attributable to common stockholders per share	$ 0.09
Diluted net income attributable to common stockholders per share	$ 0.08
Weighted average shares of common stock outstanding-diluted	54,219,807
Dividends declared per common share	$ 0.80