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Debt - Schedule of the Company's Debt (Parenthetical) (Detail)
3 Months Ended
Mar. 13, 2012
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
8.60% Senior Notes Due August 15, 2016        
Debt Instrument [Line Items]        
Interest rate   8.60%    
Maturity date   Aug. 15, 2016    
6.125% Senior Notes Due January 15, 2017        
Debt Instrument [Line Items]        
Interest rate   6.125%    
Maturity date   Jan. 15, 2017    
7.25% Senior Notes Due May 15, 2018        
Debt Instrument [Line Items]        
Interest rate   7.25%    
Maturity date   May 15, 2018    
11.25% Senior Notes Due February 1, 2019        
Debt Instrument [Line Items]        
Interest rate   11.25%    
Maturity date   Feb. 01, 2019    
Effective interest rate   13.00% 12.75%  
8.25% Senior Notes Due March 15, 2019        
Debt Instrument [Line Items]        
Interest rate 8.25% 8.25%   8.25%
Maturity date Mar. 15, 2019 Mar. 15, 2019    
7.625% Senior Notes Due June 15, 2020        
Debt Instrument [Line Items]        
Interest rate   7.625%    
Maturity date   Jun. 15, 2020    
7.875% Senior Notes Due March 15, 2021        
Debt Instrument [Line Items]        
Interest rate   7.875%    
Maturity date   Mar. 15, 2021    
8.875% Debentures Due April 15, 2021        
Debt Instrument [Line Items]        
Interest rate   8.875%    
Maturity date   Apr. 15, 2021    
7.00% Senior Notes Due February 15, 2022        
Debt Instrument [Line Items]        
Interest rate   7.00%    
Maturity date   Feb. 15, 2022    
6.50% Senior Notes Due November 15, 2023        
Debt Instrument [Line Items]        
Interest rate   6.50%    
Maturity date   Nov. 15, 2023    
6.00% Senior Notes Due due April 1, 2024        
Debt Instrument [Line Items]        
Interest rate   6.00%    
Maturity date   Apr. 01, 2024    
6.625% Debentures Due April 15, 2029        
Debt Instrument [Line Items]        
Interest rate   6.625%    
Maturity date   Apr. 15, 2029    
8.820% Debentures Due April 15, 2031        
Debt Instrument [Line Items]        
Interest rate   8.82%    
Maturity date   Apr. 15, 2031