Debt - Additional Information (Detail) (USD $)	12 Months Ended			1 Months Ended	12 Months Ended				0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Nov. 30, 2012 Queensridge [Member] Key Bank [Member]	Dec. 31, 2013 Queensridge [Member] Key Bank [Member]	Dec. 31, 2012 Queensridge [Member] Key Bank [Member]	Dec. 31, 2013 Note B [Member] Cerritos, CA [Member]	Dec. 31, 2012 Note B [Member] Cerritos, CA [Member]	Oct. 15, 2012 Notes Payable, Other Payables [Member] 5400 Westminster LP [Member]	Dec. 31, 2013 Notes Payable, Other Payables [Member] 5400 Westminster LP [Member]	Dec. 31, 2012 Notes Payable, Other Payables [Member] 5400 Westminster LP [Member]
Debt Instrument [Line Items]
Mortgage loans payable	$ 444,933,000	$ 280,576,000			$ 0	$ 23,770,000
Proceeds from mortgage loans payable	198,100,000	36,897,000	32,494,000	25,000,000
Interest rate in condition 2					4.00%	4.00%
Maturity period of the assumed debt	Aug. 15, 2022				Nov. 15, 2014				Oct. 15, 2022
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							942,000	876,000		800,000	800,000
Eliminated amount of note									$ 800,000