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Debt - Schedule of the Company's Debt (Parenthetical) (Detail)
6 Months Ended
Mar. 13, 2012
Jun. 30, 2016
Dec. 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%  
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