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Summary of Components Included in Reorganization Items (Detail) - USD ($)
$ in Thousands
 1 Months Ended 2 Months Ended 4 Months Ended
Jul. 31, 2017
Sep. 30, 2017
Jul. 31, 2017
Reorganizations [Line Items]      
Debt, sale leaseback and other reorganization items   $ 1,244  
Reorganization-related professional fees   636  
(Gain) loss on reorganization items [1]   $ 1,880  
Predecessor      
Reorganizations [Line Items]      
Gain on settlement of Liabilities subject to compromise $ (767,640)   $ (767,640)
Fresh start adjustments 1,820,018   1,820,018
Debt, sale leaseback and other reorganization items 8,493   316,504
Reorganization-related professional fees 22,858   28,023
(Gain) loss on reorganization items [1] $ 1,083,729   $ 1,396,905
[1] Refer to Note (4) for additional information regarding reorganization items.