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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Oct. 01, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Successor |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Enterprise value |  | $ 1,089,808,000 |  |
Capitalized costs | $ 38,062,000 |  | $ 195,139,000 | $ 294,345,000
Maximum reserves sold from cost center not expected to result in significant alteration (less than) |  |  | 25.00% |
Natural gas balancing liability |  |  | $ 1,700,000 | 1,600,000
Successor | Oil, natural gas and NGL revenues |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Transportation costs | 7,400,000 |  | 27,700,000 | 29,100,000
Successor | Internal Costs |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Capitalized costs | 4,000,000.0 |  | $ 8,800,000 | 14,800,000
Successor | Oil And Gas Unproved Properties |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Interest capitalized during period | $ 0 |  |  | $ 0
Predecessor |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Capitalized costs |  | 156,954,000 |  |
Predecessor | Production expenses |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Transportation costs |  | 26,200,000 |  |
Predecessor | Internal Costs |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Capitalized costs |  | 22,700,000 |  |
Predecessor | Oil And Gas Unproved Properties |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Interest capitalized during period |  | 2,200,000 |  |
Minimum | Successor | Buildings and structures |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life |  |  | 7 years |
Minimum | Successor | Equipment |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life |  |  | 1 year |
Minimum | Predecessor |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated enterprise value |  | 1,000,000,000.0 |  |
Maximum | Successor | Buildings and structures |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life |  |  | 39 years |
Maximum | Successor | Equipment |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life |  |  | 27 years |
Maximum | Predecessor |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Estimated enterprise value |  | $ 1,300,000,000 |  |

X
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