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Long-term Debt - Principal Amount of Debt by Year of Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Sep. 06, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
2017 $ 0    
2018 0    
2019 286,391    
2020 879,042    
2021 0    
Thereafter 0    
Long term debt principal amount 1,165,433    
10 % Senior Secured Toggle Notes due 2020      
Debt Instrument [Line Items]      
2017 0    
2018 0    
2019 0    
2020 697,195    
2021 0    
Thereafter 0    
Long term debt principal amount 697,195    
7 3/4% Convertible Second Lien PIK Notes due 2019      
Debt Instrument [Line Items]      
2017 0    
2018 0    
2019 268,432    
2020 0    
2021 0    
Thereafter 0    
Long term debt principal amount 268,432    
9½ % Convertible Second Lien PIK Notes due 2020      
Debt Instrument [Line Items]      
2017 0    
2018 0    
2019 0    
2020 174,182    
2021 0    
Thereafter 0    
Long term debt principal amount 174,182    
10 % Senior Secured Notes due 2020      
Debt Instrument [Line Items]      
2017 0    
2018 0    
2019 0    
2020 2,805    
2021 0    
Thereafter 0    
Long term debt principal amount 2,805 $ 2,800 $ 700,000
7 3/4% Senior Notes due 2019      
Debt Instrument [Line Items]      
2017 0    
2018 0    
2019 17,959    
2020 0    
2021 0    
Thereafter 0    
Long term debt principal amount 17,959 18,000 376,090
9 1/2% Senior Notes due 2020      
Debt Instrument [Line Items]      
2017 0    
2018 0    
2019 0    
2020 4,860    
2021 0    
Thereafter 0    
Long term debt principal amount $ 4,860 $ 4,900 $ 194,367