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Summary of Phantom Stock Activity (Detail) - $ / shares
4 Months Ended 5 Months Ended 12 Months Ended
Jul. 31, 2017
Dec. 31, 2017
Mar. 31, 2017
Predecessor      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted-average Grant-Date Fair Value, Beginning Balance Outstanding $ 24.19   $ 23.58
Weighted-average Grant-Date Fair Value, Ending Balance Outstanding     $ 24.19
Number of Shares Beginning Balance Outstanding 350,838   363,630
Number of Shares Ending Balance Outstanding     350,838
Phantom Stock Plan | Series A      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted-average Grant-Date Fair Value, Issuance of Successor phantom stock [1]   $ 1.00  
Number of Shares, Issuance of Successor phantom stock [1]   22,963  
Weighted-average Grant-Date Fair Value, Cancelled/forfeited   $ 1.00  
Weighted-average Grant-Date Fair Value, Ending Balance Outstanding   $ 1.00  
Number of Shares, Cancelled/forfeited   (1,029)  
Number of Shares Ending Balance Outstanding   21,934  
Phantom Stock Plan | Series B      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted-average Grant-Date Fair Value, Issuance of Successor phantom stock [1]   $ 0.98  
Number of Shares, Issuance of Successor phantom stock [1]   24,824  
Weighted-average Grant-Date Fair Value, Cancelled/forfeited   $ 0.98  
Weighted-average Grant-Date Fair Value, Ending Balance Outstanding   $ 0.98  
Number of Shares, Cancelled/forfeited   (1,112)  
Number of Shares Ending Balance Outstanding   23,712  
Phantom Stock Plan | Time Based Restricted Stock Awards      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted-average Grant-Date Fair Value, Issuance of Successor phantom stock [1]   $ 308.19  
Number of Shares, Issuance of Successor phantom stock [1]   14,160  
Weighted-average Grant-Date Fair Value, Cancelled/forfeited   $ 307.31  
Weighted-average Grant-Date Fair Value, Ending Balance Outstanding   $ 308.24  
Number of Shares, Cancelled/forfeited   (634)  
Number of Shares Ending Balance Outstanding   13,526  
Phantom Stock Plan | Predecessor | Time Based Restricted Stock Awards      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Weighted-average Grant-Date Fair Value, Beginning Balance Outstanding $ 9.74 $ 9.77 [1] $ 10.83
Weighted-average Grant-Date Fair Value, Vested     12.29
Weighted-average Grant-Date Fair Value, Cancelled/forfeited     13.52
Weighted-average Grant-Date Fair Value, Cancelled [2] 9.70    
Weighted-average Grant-Date Fair Value, forfeited 10.08    
Weighted-average Grant-Date Fair Value, Ending Balance Outstanding $ 9.77 [1]   $ 9.74
Number of Shares Beginning Balance Outstanding 946,150 444,838 [1] 1,599,829
Number of Shares, Vested     (585,426)
Number of Shares, Cancelled/forfeited     (68,253)
Weighted-average Grant-Date Fair Value, Cancelled [2] (484,446)    
Weighted-average Grant-Date Fair Value, forfeited (16,866)    
Number of Shares Ending Balance Outstanding 444,838 [1]   946,150
[1] Upon emergence from Chapter 11 bankruptcy, all outstanding phantom stock units held by non-officer employees were converted by the same conversion ratio applied to the common shares upon emergence. Every 31.4143 phantom stock units converted into one phantom stock unit post emergence which is valued to the new common stock. In addition, each post emergence phantom stock unit received 1.6216 phantom series A warrants and 1.7531 phantom series B warrants. Both warrant series have time-based vesting and follow the vesting schedule of the underlying phantom stock unit. Refer to Item 7. "Reorganization and Chapter 11 Proceedings."
[2] Prior to emergence from Chapter 11 bankruptcy, all officer-held phantom stock units were cancelled. Refer to Item 7. "Reorganization and Chapter 11 Proceedings."