EQUITY OF AMERICAN ASSETS TRUST, INC. (Details)			3 Months Ended		6 Months Ended
	Jun. 14, 2016 shares	May 27, 2015 USD ($) Agent	Jun. 30, 2016 USD ($) shares	Jun. 30, 2015 USD ($) shares	Jun. 30, 2016 USD ($) shares	Jun. 30, 2015 USD ($) shares
Equity [Line Items]
Noncash compensation expense			$ 600,000	$ 800,000	$ 1,300,000	$ 1,700,000
Unrecognized compensation expense			$ 2,400,000		$ 2,400,000
Weighted average unvested shares outstanding | shares			171,743	176,767	172,669	211,526
Restricted Stock Units (RSUs)
Equity [Line Items]
Granted, Shares | shares	4,900				4,900
At The Market Equity Program
Equity [Line Items]
Number of sales agents | Agent		5
Aggregate offering price of common share		$ 250,000,000.0
Common shares issued (in shares) | shares			0		0
Remaining capacity to issue			$ 216,600,000		$ 216,600,000