Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
REVENUE:
Rental income	$ 242,757	$ 225,249	$ 194,168
Other property income	12,300	10,217	8,617
Total revenue	255,057	235,466	202,785
EXPENSES:
Rental expenses	68,608	64,089	58,133
Real estate taxes	21,378	22,025	18,746
General and administrative	17,195	15,593	13,627
Depreciation and amortization	66,775	61,853	55,936
Total operating expenses	173,956	163,560	146,442
Operating income (loss)	81,101	71,906	56,343
Interest expense	(58,020)	(57,328)	(54,580)
Early extinguishment of debt	0	0	(25,867)
Loan transfer and consent fees	0	0	(8,808)
Gain on acquisition	0	0	46,371
Other income (expense), net	(487)	(629)	212
INCOME FROM CONTINUING OPERATIONS	22,594	13,949	13,671
Discontinued operations
Income from discontinued operations	0	932	1,672
Gain on sale of real estate property	0	36,720	3,981
Results from discontinued operations	0	37,652	5,653
NET INCOME	22,594	51,601	19,324
Net income attributable to restricted shares	(536)	(529)	(482)
Net loss attributable to Predecessor's noncontrolling interests in consolidated real estate entities	0	0	2,458
Net income attributable to Predecessor's controlled owners' equity	0	0	(16,995)
Net income attributable to unitholders in the Operating Partnership	(6,838)	(16,133)	(1,388)
NET INCOME ATTRIBUTABLE TO AMERICAN ASSETS TRUST, INC. STOCKHOLDERS	$ 15,220	$ 34,939	$ 2,917
EARNINGS (LOSS) PER COMMON SHARE, BASIC
Continuing operations	$ 0.38	$ 0.24	$ (0.02)
Discontinued operations	$ 0.00	$ 0.66	$ 0.10
Basic net income attributable to common stockholders per share	$ 0.38	$ 0.90	$ 0.08
Weighted average shares of common stock outstanding-basic	39,539,457	38,736,113	36,748,806
EARNINGS (LOSS) PER COMMON SHARE, DILUTED
Continuing operations	$ 0.38	$ 0.24	$ (0.02)
Discontinued operations	$ 0.00	$ 0.66	$ 0.10
Diluted net income attributable to common stockholders per share	$ 0.38	$ 0.90	$ 0.08
Weighted average shares of common stock outstanding-diluted	57,515,810	57,053,909	54,219,807