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Summary of Phantom Stock Activity (Detail) - Phantom Stock Plan - $ / shares | 4 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018
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 | $ 1.00
Weighted-average Grant-Date Fair Value, Issuance of Successor phantom stock |  | $ 1.00 |  |
Weighted-average Grant-Date Fair Value, Vested |  |  | $ 1.00 | 1.00
Weighted-average Grant-Date Fair Value, Cancelled |  |  |  | 1.00
Weighted-average Grant-Date Fair Value, Ending Balance Outstanding |  | 1.00 |  | 1.00
Weighted-average Grant-Date Fair Value, Cancelled/forfeited |  | $ 1.00 |  |
Weighted-average Grant-Date Fair Value, Cancelled |  |  |  | $ 1.00
Number of Shares Beginning Balance Outstanding |  |  | 7,650 | 21,934
Number of Shares, Issuance of Successor phantom stock |  | 22,963 |  |
Number of Shares, Vested |  |  | 7,650 | 13,009
Number of Shares, Cancelled |  |  |  | (1,275)
Number of Shares Ending Balance Outstanding |  | 21,934 |  | 7,650
Number of Shares, Cancelled/forfeited |  | (1,029) |  |
Number of Shares, Vested |  |  | (7,650) | (13,009)
Series B Warrants |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Weighted-average Grant-Date Fair Value, Beginning Balance Outstanding |  |  | $ 2.94 | $ 0.98
Weighted-average Grant-Date Fair Value, Issuance of Successor phantom stock |  | $ 0.98 |  |
Weighted-average Grant-Date Fair Value, Vested |  |  | $ 2.94 | 0.98
Weighted-average Grant-Date Fair Value, Cancelled |  |  |  | 0.98
Weighted-average Grant-Date Fair Value, Ending Balance Outstanding |  | 0.98 |  | 2.94
Weighted-average Grant-Date Fair Value, Cancelled/forfeited |  | $ 0.98 |  |
Weighted-average Grant-Date Fair Value, Cancelled |  |  |  | $ 0.98
Number of Shares Beginning Balance Outstanding |  |  | 8,269 | 23,712
Number of Shares, Issuance of Successor phantom stock |  | 24,824 |  |
Number of Shares, Vested |  |  | 8,269 | 14,064
Number of Shares, Cancelled |  |  |  | (1,379)
Number of Shares Ending Balance Outstanding |  | 23,712 |  | 8,269
Number of Shares, Cancelled/forfeited |  | (1,112) |  |
Number of Shares, Vested |  |  | (8,269) | (14,064)
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 | $ 226.50 | $ 308.24
Weighted-average Grant-Date Fair Value, Issuance of Successor phantom stock |  | 308.19 |  |
Weighted-average Grant-Date Fair Value, Vested |  |  | $ 226.50 | 360.14
Weighted-average Grant-Date Fair Value, Cancelled | 9.70 |  |  | 240.39
Weighted-average Grant-Date Fair Value, forfeited | 10.08 |  |  |
Weighted-average Grant-Date Fair Value, Ending Balance Outstanding | 9.77 | 308.24 |  | 226.50
Weighted-average Grant-Date Fair Value, Cancelled/forfeited |  | $ 307.31 |  |
Weighted-average Grant-Date Fair Value, Cancelled | $ 9.70 |  |  | $ 240.39
Number of Shares Beginning Balance Outstanding | 946,150 | 444,838 | 4,517 | 13,526
Number of Shares, Issuance of Successor phantom stock |  | 14,160 |  |
Number of Shares, Vested |  |  | 4,517 | 8,223
Number of Shares, Cancelled | (484,446) |  |  | (786)
Number of Shares, forfeited | (16,866) |  |  |
Number of Shares Ending Balance Outstanding | 444,838 | 13,526 |  | 4,517
Number of Shares, Cancelled/forfeited |  | (634) |  |
Number of Shares, Vested |  |  | (4,517) | (8,223)

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