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Long-Term Debt - 2016 Refinancing Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 31, 2016
Aug. 31, 2016
May 31, 2016
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Jul. 31, 2015
Debt Instrument [Line Items]                      
Debt instrument carrying amount       $ 1,585,258         $ 1,585,258    
Gain (loss) on extinguishment of debt       (9,700)   $ (1,700) $ 7,800   (55,776)    
Debt issuance cost   $ 12,000                  
Debt issuance costs recorded to interest expense               $ 13,200      
Unamortized debt discount and debt issuance costs       29,172         29,172 $ 46,022  
2024 notes                      
Debt Instrument [Line Items]                      
Debt instrument carrying amount   $ 750,000   $ 750,000         $ 750,000    
Private offered aggregate principal amount rate   5.625%   5.625%         5.625%    
Net percentage of proceeds from debt issuance   100.00%                  
Debt issuance cost   $ 10,500                  
2015 term loan                      
Debt Instrument [Line Items]                      
Debt instrument carrying amount       $ 467,650         $ 467,650 598,625 $ 600,000
Net percentage of proceeds from debt issuance                 99.00%    
Mandatory principal repayment amount $ 1,375 1,175             $ 1,175    
Repayment of term loan   $ 125,900                  
Gain (loss) on extinguishment of debt         $ (8,200)            
Debt issuance cost       300 1,500     $ 16,000 300    
Debt issuance costs recorded to interest expense         1,200            
Unamortized debt discount and debt issuance costs       $ 10,900         $ 10,900    
2015 term loan | Eurodollar Rate                      
Debt Instrument [Line Items]                      
Debt instrument applicable rate   3.75%             3.75%    
Debt instrument decrease in applicable margin   1.25%                  
2015 term loan | Base Rate                      
Debt Instrument [Line Items]                      
Debt instrument applicable rate   2.75%             2.75%    
Debt instrument decrease in applicable margin   1.25%                  
2021 notes                      
Debt Instrument [Line Items]                      
Debt instrument carrying amount                   $ 350,000  
Private offered aggregate principal amount rate       7.625%         7.625%    
Purchase of notes, aggregate principal amount   $ 582,600 $ 35,000                
Reduction in Principal from Debt Extinguishment         33,300 1,100          
Write off of unamortized deferred loan cost         $ 10,600 $ 600          
Debt issuance cost       $ 4,900         $ 4,900    
2021 notes | 2016 Refinancing Transactions                      
Debt Instrument [Line Items]                      
Gain (loss) on extinguishment of debt                 $ (43,900)