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Debt - Schedule of the Company's Debt (Parenthetical) (Detail)
9 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Jun. 07, 2017
Dec. 31, 2016
11.25% Senior Notes Due February 1, 2019        
Debt Instrument [Line Items]        
Interest rate 11.25%      
Maturity date Feb. 01, 2019      
11.25% Senior Notes Due February 1, 2019 | Maximum        
Debt Instrument [Line Items]        
Effective interest rate 13.25%     13.25%
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 April 1, 2024        
Debt Instrument [Line Items]        
Interest rate 6.00% 6.00%    
Maturity date Apr. 01, 2024      
6.625% Debentures Due April 15, 2029        
Debt Instrument [Line Items]        
Interest rate 6.625%   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