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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
Dec. 31, 2018
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 Warrants        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Weighted-average Grant-Date Fair Value, Beginning Balance Outstanding     $ 1.00  
Weighted-average Grant-Date Fair Value, Issuance of Successor phantom stock [1]   $ 1.00    
Weighted-average Grant-Date Fair Value, Vested     1.00  
Weighted-average Grant-Date Fair Value, Cancelled/forfeited   1.00    
Weighted-average Grant-Date Fair Value, Cancelled [2]     1.00  
Weighted-average Grant-Date Fair Value, Ending Balance Outstanding   $ 1.00 $ 1.00  
Number of Shares Beginning Balance Outstanding     21,934  
Number of Shares, Issuance of Successor phantom stock [1]   22,963    
Number of Shares, Vested     (13,009)  
Number of Shares, Cancelled/forfeited   (1,029)    
Weighted-average Grant-Date Fair Value, Cancelled [2]     (1,275)  
Number of Shares Ending Balance Outstanding   21,934 7,650  
Phantom Stock Plan | Series B Warrants        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Weighted-average Grant-Date Fair Value, Beginning Balance Outstanding     $ 0.98  
Weighted-average Grant-Date Fair Value, Issuance of Successor phantom stock [1]   $ 0.98    
Weighted-average Grant-Date Fair Value, Vested     0.98  
Weighted-average Grant-Date Fair Value, Cancelled/forfeited   0.98    
Weighted-average Grant-Date Fair Value, Cancelled [2]     0.98  
Weighted-average Grant-Date Fair Value, Ending Balance Outstanding   $ 0.98 $ 2.94  
Number of Shares Beginning Balance Outstanding     23,712  
Number of Shares, Issuance of Successor phantom stock [1]   24,824    
Number of Shares, Vested     (14,064)  
Number of Shares, Cancelled/forfeited   (1,112)    
Weighted-average Grant-Date Fair Value, Cancelled [2]     (1,379)  
Number of Shares Ending Balance Outstanding   23,712 8,269  
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, Beginning Balance Outstanding     $ 308.24  
Weighted-average Grant-Date Fair Value, Issuance of Successor phantom stock [1]   $ 308.19    
Weighted-average Grant-Date Fair Value, Vested     360.14  
Weighted-average Grant-Date Fair Value, Cancelled/forfeited   307.31    
Weighted-average Grant-Date Fair Value, Cancelled [2]     240.39  
Weighted-average Grant-Date Fair Value, Ending Balance Outstanding   $ 308.24 $ 226.50  
Number of Shares Beginning Balance Outstanding     13,526  
Number of Shares, Issuance of Successor phantom stock [1]   14,160    
Number of Shares, Vested     (8,223)  
Number of Shares, Cancelled/forfeited   (634)    
Weighted-average Grant-Date Fair Value, Cancelled [2]     (786)  
Number of Shares Ending Balance Outstanding   13,526 4,517  
Phantom Stock Plan | Time Based Restricted Stock Awards | Predecessor        
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.
[2] Prior to emergence from Chapter 11 bankruptcy, all officer-held phantom stock units were cancelled.