Schedule of Net Revenues and Operating Results (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues	$ 100,000	$ 17,400,000	$ 33,200,000
(Loss) before income taxes	(2,100,000)	(12,300,000)	(17,700,000)
Income tax benefit	800,000	4,800,000	6,900,000
Discontinued operations, net of tax	$ (1,283,000)	$ (7,509,000)	$ (10,769,000)