Income Taxes (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
IncomeTaxDisclosureTextBlockAbstract
Income Tax Expense (Benefit)	$ 297,000	$ 1,105,000	$ 2,310,000	$ 15,378,000
Valuation Allowance, Deferred Tax Asset, Change in Amount			$ 2,800,000	$ 15,100,000