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Long-Term Debt - Additional Information (Details) - USD ($) shares in Millions |  |  | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 7 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 10, 2017 | Oct. 04, 2016 | Feb. 09, 2017 | Dec. 31, 2016 | Feb. 09, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | May 11, 2017 | Oct. 02, 2021 | Oct. 03, 2018 | Oct. 03, 2017
Convertible Debt | Convertible Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  | $ 268,780,000 |  | $ 0 |  |  |  |  |
Secured Notes | New Building Note |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  | 36,528,000 |  | 37,679,000 |  |  |  |  |
Debt Instrument, Term of Interest Payments, Days Paid in Kind (after refinancing or repayment) |  |  |  |  |  |  |  | 90 days |  |  |
Successor |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Common stock issued for debt |  |  |  |  |  | 268,779,000 |  |  |  |  |
Successor | Revolving Credit Facility | First Lien Exit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 425,000,000.0 |  |  |  |  |  |  |  |  |
Cash collateral released | $ 50,000,000.0 |  |  |  |  |  |  |  |  |  |
Commitment fee |  | 0.50% |  |  |  |  |  |  |  |  |
Successor | Revolving Credit Facility | First Lien Exit Facility | Base Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 3.75% |  |  |  |  |  |  |  |  |
Successor | Revolving Credit Facility | First Lien Exit Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 4.75% |  |  |  |  |  |  |  |  |
Basis spread on variable rate floor |  | 1.00% |  |  |  |  |  |  |  |  |
Successor | Revolving Credit Facility | Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | 600,000,000.0 |  |  |  |  |  |  |  |  |  |
Borrowing base | $ 425,000,000.0 |  |  |  |  |  |  |  |  |  |
Percentage of proved reserves pledged as collateral | 95.00% |  |  |  |  |  |  |  |  |  |
Total net leverage ratio (no greater than) | 3.50 |  |  |  |  |  |  |  |  |  |
Interest coverage ratio (no less than) | 2.25 |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of default trigger | $ 25,000,000.0 |  |  |  |  |  |  |  |  |  |
Default trigger related to judgment liability | $ 25,000,000.0 |  |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  |  |  | 0 |  |  |  |  |
Commitment fee | 0.50% |  |  |  |  |  |  |  |  |  |
Successor | Revolving Credit Facility | Credit Facility | Base Rate | Minimum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.00% |  |  |  |  |  |  |  |  |  |
Successor | Revolving Credit Facility | Credit Facility | Base Rate | Maximum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 3.00% |  |  |  |  |  |  |  |  |  |
Successor | Revolving Credit Facility | Credit Facility | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 3.00% |  |  |  |  |  |  |  |  |  |
Successor | Revolving Credit Facility | Credit Facility | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 4.00% |  |  |  |  |  |  |  |  |  |
Successor | Line of Credit |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  |  | $ 7,800,000 |  |  |  |  |
Successor | Convertible Debt | Convertible Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  | $ 281,800,000 |  |  |  |  |  |  |  |  |
Fair Value |  | 445,700,000 |  |  |  |  |  |  |  |  |
Unamortized premium |  | $ 163,900,000 |  |  |  |  |  |  |  |  |
Conversion ratio for shares issuable per $1.00 in principal |  | 0.05330841 |  |  |  |  |  |  |  |  |
Common stock issued for debt |  |  | $ 5,100,000 | $ 13,000,000.0 |  |  |  |  |  |  |
Common stock issued for debt (in shares) | 14.1 | 15.0 | 0.3 | 0.7 | 1.0 |  |  |  |  |  |
Notes exchanged/converted | $ 263,700,000 |  |  |  |  |  |  |  |  |  |
Long-term debt, fixed interest rate |  |  |  |  |  | 0.00% |  |  |  |  |
Successor | Secured Notes | New Building Note |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Face amount of debt instrument |  | $ 35,000,000.0 |  |  |  | $ 35,000,000.0 |  |  |  |  |
Fair Value |  | 36,600,000 |  |  |  |  |  |  |  |  |
Proceeds remitted to unsecured creditors |  | $ 26,800,000 |  |  |  |  |  |  |  |  |
Forecast | Secured Notes | New Building Note |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Annual interest rate |  |  |  |  |  |  |  |  | 10.00% | 8.00% | 6.00%
Predecessor |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Common stock issued for debt |  |  |  |  |  |  | $ 4,409,000 |  |  |  |

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