Discontinued Operations - Results for Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Discontinued Operations And Disposal Groups [Abstract]
Revenues	$ 10		$ 1,263	$ 1,598	$ 4,261
Termination fee income			592		592
Operating expenses	(94)		(675)	(1,028)	(2,016)
Interest expense			(685)		(842)
Depreciation and amortization	(21)		(657)	(589)	(1,648)
Gain on sale of assets	1,421		945	10,948	945
Impairment loss	(2,750)	(154)	(698)	(2,904)	(698)
(Loss) income from discontinued operations	$ (1,434)		$ 85	$ 8,025	$ 594