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Debt - Additional Information (Detail) - USD ($)
12 Months Ended
Sep. 15, 2016
May 25, 2011
Dec. 31, 2016
Dec. 26, 2015
Debt Instrument [Line Items]        
Loss on extinguishment of debt     $ (15,000,000)  
Amended Credit Agreement        
Debt Instrument [Line Items]        
Credit Agreement, maximum borrowing capacity   $ 1,200,000,000    
Credit Agreement, increased borrowing capacity   $ 250,000,000    
Extended maturity date   May 13, 2021    
Minimum availability level of borrowings to avoid fixed charge coverage ratio test     125,000,000  
Excess of debt default amount resulting termination of Facility     $ 25,000,000  
Excess acquisition of ownership percentage resulting termination of Facility     40.00%  
Available credit under the Facility     $ 1,000,000,000  
Amount outstanding under credit facility     0  
Amount outstanding under letters of credit     83,000,000  
Average borrowings under the Facility     $ 0  
Amended Credit Agreement | Federal Funds Rate Plus        
Debt Instrument [Line Items]        
Alternate base rate and one month adjusted LIBOR rate     0.50%  
Amended Credit Agreement | Adjusted LIBO Rate        
Debt Instrument [Line Items]        
Alternate base rate and one month adjusted LIBOR rate     1.00%  
Line Of Credit Sub-Facility        
Debt Instrument [Line Items]        
Credit Agreement, current borrowing capacity   $ 200,000,000    
Letter Of Credit Sub Facility        
Debt Instrument [Line Items]        
Credit Agreement, current borrowing capacity   400,000,000    
Swing Line Loan Facility        
Debt Instrument [Line Items]        
Credit Agreement, current borrowing capacity   125,000,000    
Swing Line Loan Facility to European Borrowers        
Debt Instrument [Line Items]        
Credit Agreement, current borrowing capacity   $ 25,000,000    
Global Availability        
Debt Instrument [Line Items]        
Minimum availability level of borrowings to avoid cash settlement     $ 150,000,000  
European Availability        
Debt Instrument [Line Items]        
Minimum availability level of borrowings to avoid cash settlement     $ 25,000,000  
9.75% senior secured notes, due 2019        
Debt Instrument [Line Items]        
Long-term debt, interest rate 9.75%      
Long-term debt, due date 2019      
Long-term debt, redemption price percent 4.875%      
Long-term debt, amount notes outstanding $ 250,000,000      
Long-term debt, amount notes redeemed 262,000,000      
Loss on extinguishment of debt (15,000,000)      
Long-term debt, redemption premium amount $ 12,000,000      
Recourse Debt        
Debt Instrument [Line Items]        
Long-term debt, interest rate     5.00% 5.00%
Recourse Debt | Revenue bonds, due in varying amounts periodically through 2029        
Debt Instrument [Line Items]        
Senior secured notes, due date     2029 2029
Recourse Debt | American & Foreign Power Company, Inc. 5% debentures, due 2030        
Debt Instrument [Line Items]        
Long-term debt, interest rate     5.00%  
Senior secured notes, due date     2030 2030
Recourse Debt | 7.35% debentures, due 2016        
Debt Instrument [Line Items]        
Long-term debt, interest rate     7.35% 7.35%
Senior secured notes, due date     2016 2016