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Tax Credits and Losses Subject to Expiration by Major Jurisdictions (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Internal Revenue Service (IRS) | Net Operating Loss Carryforwards
 
Tax Credit Carryforward [Line Items]  
Gross Values $ 31,203
Years 2030
Internal Revenue Service (IRS) | Investment Credit
 
Tax Credit Carryforward [Line Items]  
Gross Values 15,879
Years 2015
Internal Revenue Service (IRS) | Foreign Tax Credits
 
Tax Credit Carryforward [Line Items]  
Gross Values 3,832
Years 2016 - 2019
Internal Revenue Service (IRS) | Federal Business Tax Credits
 
Tax Credit Carryforward [Line Items]  
Gross Values 3,677
Years 2026 - 2030
Connecticut State
 
Tax Credit Carryforward [Line Items]  
Gross Values 2,722
Years 2029 - 2031
Georgia State
 
Tax Credit Carryforward [Line Items]  
Gross Values 1,296
Years 2028 - 2031
Idaho State
 
Tax Credit Carryforward [Line Items]  
Gross Values 5,321
Years 2012 - 2025
North Carolina
 
Tax Credit Carryforward [Line Items]  
Gross Values 3,454
Years 2015
Oklahoma
 
Tax Credit Carryforward [Line Items]  
Gross Values $ 2,580
Years 2030 - 2031