Annual report pursuant to Section 13 and 15(d)

Net Operating Loss and Tax Credit Carryovers (Detail)

v2.4.0.6
Net Operating Loss and Tax Credit Carryovers (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Internal Revenue Service (IRS)
  
Income Tax [Line Items]  
Net operating loss $ 35,399
Net operating loss, Expiration Year 2032
State and Local Jurisdiction
  
Income Tax [Line Items]  
Net operating loss 95,780
Net operating loss, Expiration Year 2017-2027
Minimum Tax Credits
  
Income Tax [Line Items]  
Net operating loss 22,314
Net operating loss, Expiration Year Indefinite
General Business Tax Credit Carryforward
  
Income Tax [Line Items]  
Net operating loss $ 406
Net operating loss, Expiration Year 2027-2028