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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes [Line Items]      
Statutory federal income tax rate 35.00%    
Excess tax benefits associated with equity-based compensation plans allocated directly to additional paid-in capital $ 885,000 $ 855,000 $ 64,000
Tax expense, reflecting remeasurement of state deferred tax assets and liabilities 2,900,000    
Refundable tax credit per gallon of alternative fuel mixture used     0.50
Refundable tax credit per gallon of black liquor produced and used as a fuel     1.01
Deferred Tax Assets, Gross 157,467,000 167,110,000  
Unrecognized tax benefits , if recognized, would favorably impact effective tax rate 68,900,000    
Accrued interest related to tax obligations 2,400,000 2,400,000  
Change in valuation allowance 2,800,000    
Valuation Allowance of Deferred tax, Foreign
      
Income Taxes [Line Items]      
Change in valuation allowance (1,900,000)    
State Taxes and Others
      
Income Taxes [Line Items]      
Change in valuation allowance 2,500,000    
Valuation Allowance of Deferred tax, State
      
Income Taxes [Line Items]      
Change in valuation allowance $ 2,200,000