Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
ASSETS
Operating real estate	$ 2,214,094	$ 2,163,444
Construction in progress	52,044	73,121
Held for development	9,462	9,463
Total Real estate, at cost	2,275,600	2,246,028
Accumulated depreciation	(441,080)	(411,166)
Net real estate	1,834,520	1,834,862
Cash and cash equivalents	43,886	39,925
Restricted cash	9,450	11,623
Accounts receivable, net	6,747	7,518
Deferred rent receivables, net	38,875	38,422
Other assets, net	38,435	41,939
TOTAL ASSETS	1,971,913	1,974,289
LIABILITIES AND EQUITY
Secured notes payable, net	467,531	579,000
Unsecured notes payable, net	595,775	446,613
Unsecured line of credit	0	30,000
Accounts payable and accrued expenses	33,209	31,821
Security deposits payable	6,072	5,956
Other liabilities and deferred credits, net	63,428	51,972
Total liabilities	1,166,015	1,145,362
Commitments and contingencies (Note 11)
American Assets Trust, Inc. stockholders’ equity
Common stock, $0.01 par value, 490,000,000 shares authorized, 45,410,806 and 45,407,719 shares issued and outstanding at June 30, 2016 and December 31, 2015, respectively	454	454
Additional paid-in capital	864,675	863,432
Accumulated dividends in excess of net income	(71,433)	(64,066)
Accumulated other comprehensive loss	(10,281)	(258)
Total American Assets Trust, Inc. stockholders’ equity	783,415	799,562
Noncontrolling interests	22,483	29,365
Total equity	805,898	828,927
Partners' Capital [Abstract]
TOTAL LIABILITIES AND EQUITY	1,971,913	1,974,289
American Assets Trust, L.P.
ASSETS
Operating real estate	2,214,094	2,163,444
Construction in progress	52,044	73,121
Held for development	9,462	9,463
Total Real estate, at cost	2,275,600	2,246,028
Accumulated depreciation	(441,080)	(411,166)
Net real estate	1,834,520	1,834,862
Cash and cash equivalents	43,886	39,925
Restricted cash	9,450	11,623
Accounts receivable, net	6,747	7,518
Deferred rent receivables, net	38,875	38,422
Other assets, net	38,435	41,939
TOTAL ASSETS	1,971,913	1,974,289
LIABILITIES AND EQUITY
Secured notes payable, net	467,531	579,000
Unsecured notes payable, net	595,775	446,613
Unsecured line of credit	0	30,000
Accounts payable and accrued expenses	33,209	31,821
Security deposits payable	6,072	5,956
Other liabilities and deferred credits, net	63,428	51,972
Total liabilities	1,166,015	1,145,362
Commitments and contingencies (Note 11)
American Assets Trust, Inc. stockholders’ equity
Accumulated other comprehensive loss	(14,329)	(339)
Partners' Capital [Abstract]
Limited partners' capital, 17,899,516 and 17,899,516 units issued and outstanding as of June 30, 2016 and December 31, 2015, respectively	26,531	29,446
General partner's capital, 45,410,806 and 45,407,719 units issued and outstanding as of June 30, 2016 and December 31, 2015, respectively	793,696	799,820
Total capital	805,898	828,927
TOTAL LIABILITIES AND EQUITY	$ 1,971,913	$ 1,974,289