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Supplemental Information on Oil and Natural Gas Producing Activities (Unaudited) - Calculation of Weighted Average Per Unit Prices (Unaudited) (Details) - Successor | 12 Months Ended
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Dec. 31, 2018 $ / bbl $ / Mcf | Dec. 31, 2017 $ / bbl $ / Mcf | Dec. 31, 2016 $ / Mcf $ / bbl
Oil |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |
Weighted Average Sales Price (USD per barrel for Oil and NGLs/USD per Mcf for Natural Gas) | 60.86 | 48.47 | 38.59
NGL |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |
Weighted Average Sales Price (USD per barrel for Oil and NGLs/USD per Mcf for Natural Gas) | 25.62 | 20.28 | 10.99
Natural gas |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |
Weighted Average Sales Price (USD per barrel for Oil and NGLs/USD per Mcf for Natural Gas) | $ / Mcf | 1.77 | 1.90 | 1.56

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