Discontinued Operations - Results for Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Discontinued Operations And Disposal Groups [Abstract]
Revenues	$ 777	$ 3,690	$ 3,202	$ 7,746
Operating expenses	(250)	(1,814)	(1,580)	(3,346)
Interest expense	0	(565)	(446)	(1,125)
Depreciation and amortization	(237)	(1,214)	(932)	(2,600)
Gain on sale of real estate	6,569	6,752	10,994	9,527
Impairment loss	(87)	(154)	(87)	(154)
Income from discontinued operations	$ 6,772	$ 6,695	$ 11,151	$ 10,048