Consolidated Statements Of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenue:
Rental income	$ 54,320	$ 44,966
Other property income	2,718	1,917
Total revenue	57,038	46,883
Expenses:
Rental expenses	15,243	12,211
Real estate taxes	5,444	3,958
General and administrative	3,765	3,186
Depreciation and amortization	15,253	12,155
Total operating expenses	39,705	31,510
Operating income	17,333	15,373
Interest expense	(14,356)	(12,991)
Early extinguishment of debt		(25,867)
Loan transfer and consent fees		(9,019)
Gain on acquisition		46,371
Other income (expense), net	(106)	(602)
Income from continuing operations	2,871	13,265
Discontinued operations
Results from discontinued operations		331
Net income	2,871	13,596
Net income attributable to restricted shares	(132)	(86)
Net loss attributable to Predecessor's noncontrolling interests in consolidated real estate entities		2,458
Net income attributable to Predecessor's controlled owners' equity		(16,995)
Net (income) loss attributable to unitholders in the Operating Partnership	(883)	329
Net income (loss) attributable to American Assets Trust, Inc. stockholders	$ 1,856	$ (698)
Basic net income (loss) from continuing operations attributable to common stockholders per share	$ 0.05	$ (0.03)
Basic net income from discontinued operations attributable to common stockholders per share		$ 0.01
Basic net income (loss) attributable to common stockholders per share	$ 0.05	$ (0.02)
Weighted average shares of common stock outstanding-basic	38,657,170	30,924,067
Diluted net income (loss) from continuing operations attributable to common stockholders per share	$ 0.05	$ (0.03)
Diluted net income from discontinued operations attributable to common stockholders per share		$ 0.01
Diluted net income (loss) attributable to common stockholders per share	$ 0.05	$ (0.02)
Weighted average shares of common stock outstanding-diluted	57,053,259	30,924,067
Dividends declared per common share	$ 0.21	$ 0.17