Annual report pursuant to Section 13 and 15(d)

Significant Accounting Policies - Additional Information (Details)

v3.8.0.1
Significant Accounting Policies - Additional Information (Details)
3 Months Ended 4 Months Ended 12 Months Ended 16 Months Ended
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Loan
Platform
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
Loan
Sep. 07, 2016
Significant Accounting Policies [Line Items]                  
Number of loans for which maturities will be accelerated | Loan         2     2  
Outstanding obligation to secure financial assurances upon rescindment         $ 0        
Deposit Into registry of court         $ 49,500,000     $ 49,500,000  
Debt instrument, maturity acceleration, month and year         2019-02        
Debt instrument maturity, month and year         2018-11        
Natural gas imbalances       $ 5,300,000 $ 4,700,000 $ 5,300,000   4,700,000  
Percentage of discount from proved reserves         10.00%        
Ceiling test write-down of oil and natural gas properties $ 57,900,000 $ 104,600,000 $ 116,600,000   $ 0 279,063,000 $ 987,238,000    
Proved undeveloped reserves classification period to be drilled         5 years        
Revolving bank credit facility borrowings outstanding         $ 0     $ 0  
Number of Platforms Damaged | Platform         1        
Reimbursements from a third-party for damages         $ 1,100,000        
Write-offs of debt issuance costs           1,400,000 $ 3,200,000    
Hurricane Ike                  
Significant Accounting Policies [Line Items]                  
Other income related to settlement of insurance claims           $ 7,700,000      
11.00% 1.5 Lien Term Loan, Due November 2019                  
Significant Accounting Policies [Line Items]                  
Debt instrument interest rate       11.00% 11.00% 11.00%   11.00%  
11.00% 1.5 Lien Term Loan, Due November 2019 | Exchange Transaction                  
Significant Accounting Policies [Line Items]                  
Debt instrument interest rate                 11.00%
1.5 Lien Term Loan | Exchange Transaction                  
Significant Accounting Policies [Line Items]                  
Interest expense recorded for new debt       $ 0       $ 0  
Fixtures and Non-Oil and Natural Gas Property and Equipment | Minimum                  
Significant Accounting Policies [Line Items]                  
Estimated useful lives         5 years        
Fixtures and Non-Oil and Natural Gas Property and Equipment | Maximum                  
Significant Accounting Policies [Line Items]                  
Estimated useful lives         7 years        
Apache Corporation                  
Significant Accounting Policies [Line Items]                  
Deposit Into registry of court         $ 49,500,000     $ 49,500,000  
Expense related to lawsuit         $ 6,300,000