Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation - Additional Information (Details)

v3.7.0.1
Basis of Presentation - Additional Information (Details)
Jun. 30, 2017
USD ($)
Loan
Dec. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
Basis Of Presentation [Line Items]      
Number of loans for which maturities will be accelerated | Loan 2    
Obligation to secure financial assurances     $ 260,800,000
Escrow deposit $ 49,500,000    
Oil and natural gas properties and equipment - full cost method, amount excluded from amortization 0 $ 0  
Apache Corporation      
Basis Of Presentation [Line Items]      
Escrow deposit $ 49,500,000