EQUITY OF AMERICAN ASSETS TRUST, INC. (Details) (USD $)	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	May 06, 2013 Agent	Mar. 09, 2015	Sep. 12, 2014
Equity [Line Items]
Noncash compensation expense	$ 900,000	$ 500,000
Unrecognized compensation expense	3,900,000
Weighted average unvested shares outstanding	246,672	406,856
At The Market Equity Program
Equity [Line Items]
Number of sales agents			4
Aggregate offering price of common share			150,000,000.0
Remaining capacity to issue	30,100,000
Common shares issued (in shares)	53,800
Gross proceeds from issuance of common stock	2,288,000
ICW Inc | Board of Directors Chairman | Private Placement
Equity [Line Items]
Common shares issued (in shares)				200,000	400,000
Share price (in dollars per share)				$ 40.54	$ 33.76
Gross proceeds from issuance of common stock				$ 8,100,000	$ 13,500,000
Operating Partnership Units
Equity [Line Items]
Antidilutive securities excluded from computation of EPS	246,672	406,856