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Pre-Bankruptcy Long-Term Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Feb. 11, 2016
Dec. 31, 2014
Debt Instrument [Line Items]      
Long-term debt $ 841,261 $ 819,955  
Long-term debt, net $ 839,831 $ 818,525  
Predecessor      
Debt Instrument [Line Items]      
Long-term debt     $ 2,550,603
Less current maturities of long-term debt and revolving credit facility     53,500
Long-term debt, net     2,497,103
Predecessor | 7.5% Senior Notes      
Debt Instrument [Line Items]      
Long-term debt [1]     1,118,615
Predecessor | 7.125% Senior Notes      
Debt Instrument [Line Items]      
Long-term debt [1]     727,622
Predecessor | 2017 Term Loan      
Debt Instrument [Line Items]      
Long-term debt [1]     364,159
Predecessor | 2019 Term Loan      
Debt Instrument [Line Items]      
Long-term debt [1]     $ 340,207
[1] Classified as Liabilities Subject to Compromise as of December 31, 2015.