Discontinued Operations - Results for Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Discontinued Operations And Disposal Groups [Abstract]
Revenues	$ 1,981	$ 3,400
Operating expenses	(1,330)	(1,530)
Interest expense	(446)	(341)
Depreciation and amortization	(525)	(1,086)
Gain on sale of assets	4,425	2,775
Income from discontinued operations	$ 4,105	$ 3,218