Discontinued Operations - Revenue and Components of Discontinued Operations, Net of Tax (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012
Discontinued Operations And Disposal Groups [Abstract]
Revenue	$ 1,892	$ 5,704
Loss from discontinued operations before income taxes	(924)	(11,942)
Income tax benefit	362	4,678
Loss from discontinued operations	(562)	(7,264)
Loss on sale of discontinued operations, before income taxes	(2,416)	(2,416)
Income tax benefit	586	586
Loss on sale of discontinued operations	(1,830)	(1,830)
Total loss from discontinued operations	$ (2,392)	$ (9,094)