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Debt - Schedule of the Company's Debt (Parenthetical) (Detail)
12 Months Ended
Aug. 31, 2016
Mar. 20, 2014
Dec. 31, 2016
Dec. 31, 2015
Oct. 06, 2016
Feb. 29, 2016
8.60% Senior Notes Due August 15, 2016            
Debt Instrument [Line Items]            
Interest rate     8.60%      
Maturity date     Aug. 15, 2016      
11.25% Senior Notes Due February 1, 2019            
Debt Instrument [Line Items]            
Interest rate       11.25%    
Maturity date       Feb. 01, 2019    
Effective interest rate       12.75% 13.25% 13.00%
11.25% Senior Notes Due February 1, 2019 | Maximum            
Debt Instrument [Line Items]            
Effective interest rate     13.25%      
7.625% Senior Notes Due June 15, 2020            
Debt Instrument [Line Items]            
Interest rate   7.625% 7.625%      
Maturity date   Jun. 15, 2020 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%   7.00%      
Maturity date Feb. 15, 2022   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