Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
ASSETS
Operating real estate	$ 2,477,653	$ 2,241,061
Construction in progress	61,415	50,498
Held for development	9,447	9,447
Total Real estate, at cost	2,548,515	2,301,006
Accumulated depreciation	(502,551)	(469,460)
Net real estate	2,045,964	1,831,546
Cash and cash equivalents	31,380	44,801
Restricted cash	9,211	9,950
Accounts receivable, net	6,483	9,330
Deferred rent receivables, net	37,924	38,452
Other assets, net	40,214	52,854
TOTAL ASSETS	2,171,176	1,986,933
LIABILITIES AND EQUITY
Secured notes payable, net	280,170	445,180
Unsecured notes payable, net	944,816	596,350
Unsecured line of credit	0	20,000
Accounts payable and accrued expenses	40,884	32,401
Security deposits payable	6,779	6,114
Other liabilities and deferred credits, net	46,164	48,337
Total liabilities	1,318,813	1,148,382
Commitments and contingencies (Note 12)
American Assets Trust, Inc. stockholders’ equity
Common stock, $0.01 par value, 490,000,000 shares authorized, 47,130,063 and 45,732,109 shares issued and outstanding at June 30, 2017 and December 31, 2016, respectively	471	457
Additional paid-in capital	916,695	874,597
Accumulated dividends in excess of net income	(88,595)	(77,296)
Accumulated other comprehensive income	10,494	11,798
Total American Assets Trust, Inc. stockholders’ equity	839,065	809,556
Noncontrolling interests	13,298	28,995
Total equity	852,363	838,551
Partners' Capital [Abstract]
TOTAL LIABILITIES AND EQUITY	2,171,176	1,986,933
American Assets Trust, L.P.
ASSETS
Operating real estate	2,477,653	2,241,061
Construction in progress	61,415	50,498
Held for development	9,447	9,447
Total Real estate, at cost	2,548,515	2,301,006
Accumulated depreciation	(502,551)	(469,460)
Net real estate	2,045,964	1,831,546
Cash and cash equivalents	31,380	44,801
Restricted cash	9,211	9,950
Accounts receivable, net	6,483	9,330
Deferred rent receivables, net	37,924	38,452
Other assets, net	40,214	52,854
TOTAL ASSETS	2,171,176	1,986,933
LIABILITIES AND EQUITY
Secured notes payable, net	280,170	445,180
Unsecured notes payable, net	944,816	596,350
Unsecured line of credit	0	20,000
Accounts payable and accrued expenses	40,884	32,401
Security deposits payable	6,779	6,114
Other liabilities and deferred credits, net	46,164	48,337
Total liabilities	1,318,813	1,148,382
Commitments and contingencies (Note 12)
American Assets Trust, Inc. stockholders’ equity
Accumulated other comprehensive income	14,489	16,478
Partners' Capital [Abstract]
Limited partners' capital, 17,194,980 and 17,888,822 units issued and outstanding as of June 30, 2017 and December 31, 2016, respectively	9,303	24,315
General partner's capital, 47,130,063 and 45,732,109 units issued and outstanding as of June 30, 2017 and December 31, 2016, respectively	828,571	797,758
Total capital	852,363	838,551
TOTAL LIABILITIES AND EQUITY	$ 2,171,176	$ 1,986,933