Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Deferred Tax Liability Not Recognized [Line Items]
Statutory federal income tax rate	35.00%
Operating loss carry forwards, federal	$ 83,500,000	$ 92,000,000
Operating loss carry forwards, state	596,800,000	612,600,000
Operating loss carry forwards, expiration year	2031
Deferred tax asset, valuation allowance	92,599,000	95,469,000
Valuation allowance to offset deferred tax asset	3,000,000	3,800,000
Unrecognized Tax Benefits	1,722,000	1,722,000	1,401,000
State and Local Jurisdiction
Deferred Tax Liability Not Recognized [Line Items]
Net operating loss, valuation allowance	$ 9,600,000	$ 10,400,000