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Stock-based Compensation - Summary of PSU Activity (Detail) (Potential Performance Shares (PSU)) - Performance Share Units (PSU) - USD ($) $ / shares in Units, $ in Thousands | 5 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Aug. 13, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |  |  |
Beginning balance, number of units, outstanding |  |  | 931,890 |
Number of units, granted | 336,000 | 361,000 | 232,088 | 619,000
Number of unit, forfeitures |  |  | (27,490) |
Ending balance, number of units, outstanding |  |  | 1,136,488 | 931,890
Beginning balance, weighted average grant price, outstanding |  |  | $ 9.56 |
Weighted average grant price, granted | $ 12.93 | $ 12.52 | 8.37 | $ 7.85
Weighted average grant price, forfeitures |  |  | 8.91 |
Ending balance, weighted average grant price, outstanding |  |  | $ 9.33 | $ 9.56
Number of PSUs granted | 336,000 | 361,000 | 232,088 | 619,000
Grant date fair value | $ 4,339 | $ 4,517 | $ 1,943 | $ 4,857
Grant date fair value per unit | $ 12.93 | $ 12.52 | $ 8.37 | $ 7.85
Compensation expense recognized for PSUs | $ 543 | $ 1,651 | $ 3,217 | $ 1,899
Unrecognized compensation expense related to unvested shares |  |  | $ 4,945 |
Expected recognition period |  |  | 1 year 8 months 12 days |

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