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Debt - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 05, 2015
Mar. 28, 2015
Jan. 31, 2015
Nov. 30, 2014
Mar. 31, 2014
Mar. 28, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Oct. 31, 2014
Mar. 29, 2014
Debt Instrument [Line Items]                      
Debt issuance costs             $ 0 $ 0 $ 18,100,000    
Loss on extinguishment of debt             0 14,300,000 17,900,000    
Cash restricted for use - repurchase of senior notes             $ 0 250,000,000 0    
Percentage owned, domestic subsidiaries             100.00%        
Eagle Ottawa                      
Debt Instrument [Line Items]                      
Restricted cash used to finance the acquisition $ 350,000,000                    
2023 Notes | Senior notes                      
Debt Instrument [Line Items]                      
Long-term debt, aggregate principal amount             $ 500,000,000        
Stated interest rate             4.75%        
2023 Notes | Prior to January 15, 2018 | Senior notes                      
Debt Instrument [Line Items]                      
Senior notes, redemption price percentage, make whole premium             100.00%        
2024 Notes | Senior notes                      
Debt Instrument [Line Items]                      
Long-term debt, aggregate principal amount             $ 325,000,000        
Stated interest rate             5.375%        
Proceeds from issuance of debt         $ 325,000,000            
Debt issuance costs         $ 3,900,000            
2024 Notes | Prior to March 15, 2017 | Senior notes                      
Debt Instrument [Line Items]                      
Senior notes, redeemable percentage of the aggregate principal amount of the Notes in equity offerings             35.00%        
Percentage of debt redemption price             105.375%        
Outstanding original aggregate principal amount             65.00%        
Redemption of notes, period from closing of equity offering             90 days        
2024 Notes | Prior to March 15, 2019 | Senior notes                      
Debt Instrument [Line Items]                      
Percentage of debt redemption price             100.00%        
2025 Notes | Senior notes                      
Debt Instrument [Line Items]                      
Long-term debt, aggregate principal amount             $ 650,000,000        
Stated interest rate       5.25%     5.25%        
Proceeds from issuance of debt       $ 650,000,000              
Debt issuance costs       8,400,000              
2025 Notes | Senior notes | Eagle Ottawa                      
Debt Instrument [Line Items]                      
Restricted cash used to finance the acquisition $ 350,000,000                    
2025 Notes | Prior to January 15, 2018 | Senior notes                      
Debt Instrument [Line Items]                      
Senior notes, redeemable percentage of the aggregate principal amount of the Notes in equity offerings             40.00%        
Percentage of debt redemption price             105.25%        
Outstanding original aggregate principal amount             50.00%        
2025 Notes | Prior to January 15, 2020 | Senior notes                      
Debt Instrument [Line Items]                      
Percentage of debt redemption price             100.00%        
Redemption of notes, period from closing of equity offering             120 days        
2018 Notes | Senior notes                      
Debt Instrument [Line Items]                      
Aggregate principal amount of debt redeemed                     $ 280,000,000
2020 Notes                      
Debt Instrument [Line Items]                      
Loss on extinguishment of debt           $ 14,300,000          
2020 Notes | Senior notes                      
Debt Instrument [Line Items]                      
Aggregate principal amount of debt redeemed       245,000,000              
Percentage of debt redemption   104.063%     10.00%            
Repayments of debt         $ 35,000,000            
Cash restricted for use - repurchase of senior notes   $ 250,000,000   250,000,000              
2020 Notes | Senior notes | Unsecured debt                      
Debt Instrument [Line Items]                      
Loss on extinguishment of debt               14,300,000      
Repayments of senior debt   $ 255,000,000                  
2018 and 2020 Notes | Senior notes                      
Debt Instrument [Line Items]                      
Repayments of debt                 327,100,000    
Loss on extinguishment of debt                 $ 17,500,000    
Credit Agreement                      
Debt Instrument [Line Items]                      
Debt issuance costs       5,800,000              
Loss on extinguishment of debt       400,000              
Lines of credit                      
Debt Instrument [Line Items]                      
Credit facility, borrowing capacity             $ 21,400,000.0 10,000,000      
Credit facility, amount outstanding, short-term             8,600,000 0      
Term Loan Facility | Credit Agreement — Term Loan Facility                      
Debt Instrument [Line Items]                      
Credit facility, borrowing capacity       500,000,000              
Term loan facility borrowings       $ 500,000,000              
Required principal payments             $ 21,900,000 9,400,000      
Term Loan Facility | Credit Agreement — Term Loan Facility | Eurocurrency Rate                      
Debt Instrument [Line Items]                      
Interest rate             1.375%        
Term Loan Facility | Credit Agreement — Term Loan Facility | Eurocurrency Rate | Minimum                      
Debt Instrument [Line Items]                      
Margin on variable interest rate       1.25%              
Term Loan Facility | Credit Agreement — Term Loan Facility | Eurocurrency Rate | Maximum                      
Debt Instrument [Line Items]                      
Margin on variable interest rate       2.25%              
Term Loan Facility | Credit Agreement — Term Loan Facility | Adjusted Base Rate                      
Debt Instrument [Line Items]                      
Interest rate             0.375%        
Term Loan Facility | Credit Agreement — Term Loan Facility | Adjusted Base Rate | Minimum                      
Debt Instrument [Line Items]                      
Margin on variable interest rate       0.25%              
Term Loan Facility | Credit Agreement — Term Loan Facility | Adjusted Base Rate | Maximum                      
Debt Instrument [Line Items]                      
Margin on variable interest rate       1.25%              
Term Loan Facility | Credit Agreement — Term Loan Facility | Eagle Ottawa                      
Debt Instrument [Line Items]                      
Proceeds from issuance of debt     $ 500,000,000                
Revolving Credit Facility | Credit Agreement                      
Debt Instrument [Line Items]                      
Percentage owned, domestic subsidiaries       100.00%              
Revolving Credit Facility | Credit Agreement — Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Credit facility, borrowing capacity       $ 1,250,000,000.00           $ 1,000,000,000.0  
Borrowings outstanding             $ 0 0      
Credit facility, aggregate proceeds             0 48,000,000      
Credit facility, aggregate repayments             $ 0 $ 48,000,000      
Revolving Credit Facility | Credit Agreement — Revolving Credit Facility | Minimum                      
Debt Instrument [Line Items]                      
Line of credit facility, facility fee       0.25%              
Revolving Credit Facility | Credit Agreement — Revolving Credit Facility | Maximum                      
Debt Instrument [Line Items]                      
Line of credit facility, facility fee       0.50%              
Revolving Credit Facility | Credit Agreement — Revolving Credit Facility | Eurocurrency Rate                      
Debt Instrument [Line Items]                      
Interest rate             1.25%        
Revolving Credit Facility | Credit Agreement — Revolving Credit Facility | Eurocurrency Rate | Minimum                      
Debt Instrument [Line Items]                      
Margin on variable interest rate       1.00%              
Revolving Credit Facility | Credit Agreement — Revolving Credit Facility | Eurocurrency Rate | Maximum                      
Debt Instrument [Line Items]                      
Margin on variable interest rate       2.25%              
Revolving Credit Facility | Credit Agreement — Revolving Credit Facility | Adjusted Base Rate                      
Debt Instrument [Line Items]                      
Interest rate             0.25%        
Revolving Credit Facility | Credit Agreement — Revolving Credit Facility | Adjusted Base Rate | Minimum                      
Debt Instrument [Line Items]                      
Margin on variable interest rate       0.00%              
Revolving Credit Facility | Credit Agreement — Revolving Credit Facility | Adjusted Base Rate | Maximum                      
Debt Instrument [Line Items]                      
Margin on variable interest rate       1.25%