Major Tenants - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Percentage of total rental income	10.00%	10.00%
Sears
Segment Reporting Information [Line Items]
Outstanding rent	$ 1
Number of locations	5	5
CVS
Segment Reporting Information [Line Items]
Outstanding rent	$ 4
Number of locations	5	5
Sun Microsystems
Segment Reporting Information [Line Items]
Number of locations	1	1