Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Detail)

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Income Taxes - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax And Carryforwards [Line Items]      
Provision for (benefit from) income taxes $ 153,000 $ 6,110,000 $ 2,695,000
Valuation allowance to offset deferred tax asset 2,913,000 2,798,000  
Discontinued Operations
     
Income Tax And Carryforwards [Line Items]      
Provision for (benefit from) income taxes (60,000) 500,000 30,000
Federal Tax
     
Income Tax And Carryforwards [Line Items]      
Net operating loss carryforwards 125,900,000    
Net operating loss carryforwards, beginning expiry year 2020    
Net operating loss carryforwards, ending expiry year 2032    
State
     
Income Tax And Carryforwards [Line Items]      
Net operating loss carryforwards $ 844,500,000    
Net operating loss carryforwards, beginning expiry year 2013    
Net operating loss carryforwards, ending expiry year 2032