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Supplemental Information on Oil and Natural Gas Producing Activities (Unaudited) - Estimate of Changes in Standardized Measure of Discounted Future Net Cash Flows from Proved Reserves (Unaudited) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2016
Oct. 01, 2016
Dec. 31, 2017
Dec. 31, 2015
Successor        
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]        
Present value, beginning balance $ 392,604   $ 438,364  
Changes during the year        
Adoption of ASU 2015-02 0   0  
Revenues less production (70,668)   (239,838)  
Net changes in prices, production and other costs 35,684   347,458  
Development costs incurred 7,941   35,517  
Net changes in future development costs (291,232)   (64,484)  
Extensions and discoveries 14,986   112,556  
Revisions of previous quantity estimates 308,374   26,697  
Accretion of discount 9,375   37,226  
Net change in income taxes 0   23  
Purchases of reserves in-place 0   454  
Sales of reserves in-place 0   (2,977)  
Timing differences and other 31,300   58,298  
Net change for the year 45,760   310,930  
Present value, ending balance 438,364 $ 392,604 $ 749,294  
Predecessor        
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]        
Present value, beginning balance $ 392,604 1,314,562   $ 4,087,752
Changes during the year        
Adoption of ASU 2015-02   (224,965)   0
Revenues less production   (144,256)   (383,293)
Net changes in prices, production and other costs   (394,173)   (3,813,465)
Development costs incurred   69,080   217,596
Net changes in future development costs   436,041   273,437
Extensions and discoveries   12,449   230,055
Revisions of previous quantity estimates   (728,254)   (1,354,778)
Accretion of discount   91,337   512,483
Net change in income taxes   402   1,426,333
Purchases of reserves in-place   0   18,429
Sales of reserves in-place   (13,314)   0
Timing differences and other   (26,305)   100,013
Net change for the year   (921,958)   (2,773,190)
Present value, ending balance   392,604   1,314,562
Noncontrolling Interest | Predecessor        
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]        
Present value, beginning balance   $ 224,600    
Changes during the year        
Present value, ending balance       $ 224,600