Debt - Additional Information (Detail) (USD $)	6 Months Ended		1 Months Ended	6 Months Ended	1 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Oct. 31, 2012 5400 Westminster LP [Member]	Jun. 30, 2013 Note B [Member] Cerritos, CA [Member]	Oct. 31, 2012 Notes Payable, Other Payables [Member]
Debt Instrument [Line Items]
Outstanding mortgage loans payable	$ 325,026,000	$ 280,576,000
Note Issued				14,500,000	1,600,000
Interest Rate of B Note				6.6996%	15.00%
Amount payable on notes for interest accruing				12,000
Percentage on return on capital				9.00%
Outstanding balance of loan				845,000	800,000
Maturity period of the assumed debt	Aug. 15, 2022				Oct. 15, 2022
Percentage of trust holds loan			50.00%
Eliminated amount of note					$ 800,000