Income Taxes - Income Tax Provision (Benefit) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Expense Benefit [Line Items]
Income tax provision from continuing operations	$ 3,665,000	$ 5,582,000	$ 3,021,000
Income tax (benefit) from discontinued operations	(570,000)	(5,051,000)	(3,351,000)
Total income tax provision (benefit)	$ 3,095,000	$ 531,000	$ (330,000)