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Summary of Components Included in Reorganization Items (Detail) - USD ($) $ in Thousands | 4 Months Ended | 5 Months Ended
--- | --- | ---
Jul. 31, 2017 | Dec. 31, 2017
Reorganization Items [Abstract] |  |
Gain on settlement of Liabilities subject to compromise | $ (767,640) |
Fresh start adjustments | 1,820,018 |
Debt, sale leaseback and other reorganization items | 316,504 | $ 1,631
Reorganization-related professional fees | 28,023 | 2,668
Loss on reorganization items | $ 1,396,905 | $ 4,299

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