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Debt - Narrative (Detail) - USD ($)
3 Months Ended 9 Months Ended
May. 15, 2015
Mar. 20, 2014
Mar. 13, 2012
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Debt Instrument [Line Items]                
Amount of difference between fair value and book value       $ 3,200,000   $ 3,200,000   $ 259,500,000
Weighted average interest rate on borrowings           2.00% 2.00%  
Repayment of Debt           $ 271,800,000 $ 811,300,000  
Loss on debt extinguishment             77,100,000  
Interest paid, net of interest received       $ 1,300,000 $ 1,900,000 $ 4,200,000 6,600,000  
5.50% Senior Notes Due May 15, 2015                
Debt Instrument [Line Items]                
Repayment of Debt $ 200,000,000              
Interest rate       5.50%   5.50%    
Maturity date           May 15, 2015    
Senior notes               200,000,000
6.00% Senior Notes Due due April 1, 2024                
Debt Instrument [Line Items]                
Interest rate       6.00%   6.00%    
Maturity date           Apr. 01, 2024    
Senior notes   $ 400,000,000   $ 400,000,000   $ 400,000,000   400,000,000
8.25% Senior Notes Due March 15, 2019                
Debt Instrument [Line Items]                
Repayment of Debt   $ 211,100,000         211,100,000  
Interest rate   8.25% 8.25% 8.25%   8.25%    
Maturity date   Mar. 15, 2019 Mar. 15, 2019     Mar. 15, 2019    
Senior notes     $ 450,000,000 $ 238,900,000   $ 238,900,000   238,900,000
7.25% Senior Notes Due May 15, 2018                
Debt Instrument [Line Items]                
Repayment of Debt   $ 100,000,000            
Interest rate   7.25%   7.25%   7.25%    
Maturity date   May 15, 2018       May 15, 2018    
Senior notes       $ 250,000,000   $ 250,000,000   250,000,000
7.625% Senior Notes Due June 15, 2020                
Debt Instrument [Line Items]                
Repayment of Debt   $ 50,000,000            
Interest rate   7.625%   7.625%   7.625%    
Maturity date   Jun. 15, 2020       Jun. 15, 2020    
Senior notes       $ 350,000,000   $ 350,000,000   $ 350,000,000
Debt Instruments Extinguished Three                
Debt Instrument [Line Items]                
Loss on debt extinguishment             77,100,000  
Gain due to termination of related interest rate swaps             $ 2,800,000  
Credit Agreements                
Debt Instrument [Line Items]                
Allowable annual dividend payment under credit agreement       225,000,000   225,000,000    
Revolving Credit Facility                
Debt Instrument [Line Items]                
Total amount of revolving credit agreement       1,500,000,000   $ 1,500,000,000    
Line of credit facility, expiration date           Sep. 09, 2019    
Line of credit facility amendment date           Sep. 09, 2014    
Scenario, Previously Reported | Revolving Credit Facility                
Debt Instrument [Line Items]                
Total amount of revolving credit agreement       $ 1,150,000,000   $ 1,150,000,000    
Line of credit facility, expiration date           Oct. 15, 2017