Real Estate Activity - Summary of Revenues and Expenses of Income from Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues
Rental		$ 1,113		$ 3,272
Other property revenues		111		327
Total revenues		1,224		3,599
Expenses
Property operating and maintenance		540		1,509
Depreciation		175		527
Interest		88		266
Total expenses		803		2,302
Income from discontinued property operations	$ 0	$ 421	$ 0	$ 1,297