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Debt - Schedule of the Company's Debt (Parenthetical) (Detail)
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
11.25% Senior Notes Due February 1, 2019    
Debt Instrument [Line Items]    
Interest rate 11.25%  
Maturity date Feb. 01, 2019  
Effective interest rate 13.25% 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%  
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