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Stock-based Compensation - Additional Information (Detail) - USD ($) $ in Thousands |  | 5 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 14, 2018 | Dec. 31, 2018 | Aug. 13, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense recognized |  | $ 994 | $ 3,912 | $ 6,464 | $ 4,020
Performance multiplier, minimum |  |  |  | 0.00% |
Performance multiplier, maximum |  |  |  | 200.00% |
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares of unvested common stock outstanding (in shares) |  |  |  | 1,038,006 | 1,092,309
Fair value of vested restricted stock |  | 3,541 | $ 2,676 | $ 2,852 | $ 925
Performance Share Units (PSU) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Amortized vesting period of restricted stock |  |  |  | 3 years |
Minimum final number of shares of common stock issuable based on performance multiplier (in shares) |  |  |  | 0 |
Maximum final number of shares of common stock issuable based on performance multiplier (in shares) |  |  |  | 2,272,976 |
Number of units, earned |  |  | 85,987 |  |
Shares of unvested common stock outstanding (in shares) | 1,028,672 |  |  |  |
Fair value of vested restricted stock | $ 8,800 |  |  |  |
Minimum | Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Amortized vesting period of restricted stock |  |  |  | 1 year |
Maximum | Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Amortized vesting period of restricted stock |  |  |  | 3 years |
General and Administrative Expense |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense recognized |  | $ 1,000 | $ 3,900 | $ 6,500 | $ 4,000
2019 Long Term Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Long-term Incentive Plan shares available for future awards of performance share units, restricted stock grants or other equity awards (in shares) |  |  |  | 4,776,556 |

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