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Stock-Based Compensation and Incentive Plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 4 Months Ended | 5 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Jul. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
2017 Stock Incentive Plan | Plan of Reorganization |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
General vesting period, years |  |  |  |  |  |  | 3 years |
Stock Options |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock options granted |  |  |  | 0 | 0 | 0 |  |
Option awards outstanding |  |  |  |  | 1,395,548 |  |  |
Weighted average exercise price |  |  |  |  | $ 28.14 |  |  |
Stock option compensation expense |  | $ 1,600 |  |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total unrecognized stock compensation costs |  |  |  |  | $ 6,300 | $ 22,600 |  |
Unrecognized compensation costs, weighted-average recognition period |  |  |  |  |  | 2 years |  |
Total unrecognized stock compensation costs, net of tax |  |  |  |  | 5,000 | $ 17,100 |  |
Compensation expense |  | 2 | $ 3,731 |  | $ 19,603 | 13,406 |  |
Restricted Stock Units (RSUs) | Time Based Restricted Stock Awards |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share based compensation outstanding number |  |  |  |  | 167,856 |  |  |
Restricted Stock Units (RSUs) | 2017 Stock Incentive Plan | Plan of Reorganization | Director |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
General vesting period, years |  |  |  |  |  |  | 1 year |
Restricted Stock Units (RSUs) | 2017 Stock Incentive Plan | Plan of Reorganization | President, and Chief Executive Officer |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
General vesting period, years | 3 years |  |  |  |  |  |  |
Phantom Stock Plan |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
General vesting period, years |  |  |  |  | 3 years |  |  |
Total unrecognized stock compensation costs |  |  |  |  | $ 0 | 30 |  |
New awards issued |  |  |  |  | 0 |  |  |
Compensation expense |  | $ 68 | $ 94 |  | $ 30 | $ 214 |  |
Phantom Stock Plan | Time Based Restricted Stock Awards |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of units outstanding |  | 444,838 | 13,526 | 13,526 |  | 4,517 | 13,526 | 946,150
Weighted average grant date fair value |  | $ 9.77 | $ 308.24 | $ 308.24 |  | $ 226.50 | $ 308.24 | $ 9.74
Cash-based Performance Plan |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of units outstanding |  | 7,700,000 |  |  |  |  |  |
Weighted average grant date fair value |  |  |  |  |  |  |  | $ 1.16
Compensation expense |  | $ 2,000 |  |  |  |  |  |
Deferred Stock Unit Plan |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
New awards have been issued |  |  |  |  | 0 |  |  |
Number of Shares, Retirement distribution |  | 351,000 |  |  |  |  |  |
Weighted-average Grant-Date Fair Value, Retirement distribution |  | $ 24.19 |  |  |  |  |  |

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