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Schedule of Fair Value of Senior Notes (Parenthetical) (Detail)
12 Months Ended
Dec. 26, 2015
Dec. 27, 2014
Mar. 14, 2012
9.75% senior secured notes, due 2019      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, interest rate     9.75%
Recourse Debt | 7.35% debentures, due 2016      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, interest rate 7.35%    
Recourse Debt | American & Foreign Power Company, Inc. 5% debentures, due 2030      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, interest rate 5.00% 5.00%  
Carrying Value | Recourse Debt | 9.75% senior secured notes, due 2019      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, interest rate 9.75% 9.75%  
Long-term debt, due date 2019 2019  
Carrying Value | Recourse Debt | 7.35% debentures, due 2016      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, interest rate 7.35% 7.35%  
Long-term debt, due date 2016 2016  
Carrying Value | Recourse Debt | Revenue bonds, due in varying amounts periodically through 2029      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, due date 2029 2029  
Carrying Value | Recourse Debt | American & Foreign Power Company, Inc. 5% debentures, due 2030      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, interest rate 5.00% 5.00%  
Long-term debt, due date 2030 2030  
Fair Value | Recourse Debt | 9.75% senior secured notes, due 2019      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, interest rate 9.75% 9.75%  
Long-term debt, due date 2019 2019  
Fair Value | Recourse Debt | 7.35% debentures, due 2016      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, interest rate 7.35% 7.35%  
Long-term debt, due date 2016 2016  
Fair Value | Recourse Debt | Revenue bonds, due in varying amounts periodically through 2029      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, due date 2029 2029  
Fair Value | Recourse Debt | American & Foreign Power Company, Inc. 5% debentures, due 2030      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, interest rate 5.00% 5.00%  
Long-term debt, due date 2030 2030