Real Estate Activity - Summary of Revenues and Expenses of Income from Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Revenues
Rental	$ 1,089	$ 2,159
Other property revenues	115	216
Total revenues	1,204	2,375
Expenses
Property operating and maintenance	498	969
Depreciation	175	352
Interest	88	178
Total expenses	761	1,499
Income from discontinued property operations	$ 443	$ 876