Annual report pursuant to Section 13 and 15(d)

Fair Value of Derivative Instruments on Condensed Consolidated Balance Sheets (Detail)

v3.10.0.1
Fair Value of Derivative Instruments on Condensed Consolidated Balance Sheets (Detail) - USD ($)
$ in Thousands
4 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 12, 2016
Dec. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]        
Derivative assets, current     $ 34,932 $ 0
Derivative assets, noncurrent     10,100 0
Derivative liabilities, noncurrent     0 13,900
Derivative Asset     45,032 0
Derivative liabilities, current     991 27,777
Derivative liabilities     991 41,677
Commodity contracts        
Derivatives, Fair Value [Line Items]        
Derivative Asset     44,000  
Commodity contracts | Derivative assets/liabilities - current        
Derivatives, Fair Value [Line Items]        
Derivative assets, current     34,932 0
Derivative liabilities, current     991 27,777
Commodity contracts | Derivative assets/liabilities - noncurrent        
Derivatives, Fair Value [Line Items]        
Derivative assets, noncurrent     10,100 0
Derivative liabilities, noncurrent     0 13,900
Successor [Member]        
Derivatives, Fair Value [Line Items]        
Derivatives $ (16,622)   37,427 (17,819)
Predecessor [Member]        
Derivatives, Fair Value [Line Items]        
Derivatives   $ (8,333)    
Fair Value, Measurements, Recurring | Commodity contracts        
Derivatives, Fair Value [Line Items]        
Derivative assets, current     34,932  
Derivative assets, noncurrent     10,100  
Derivative liabilities, noncurrent     0 13,900
Derivative liabilities, current     $ (991) $ (27,777)