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Summary of Significant Accounting Policies - Common Stock and Convertible Stock Dilutive in Computation of Earning Per Share (Detail) - $ / shares shares in Thousands | 5 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Aug. 13, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Weighted average PSUs | 328 | 476 | 632 | 0
Weighted average grant date fair value per unit | $ 12.93 | $ 13.83 | $ 9.33 | $ 0
Weighted average convertible preferred stock | 0 | 0 | 63,832 | 0
Weighted average warrants for common stock (in shares) | 0 | 142 | 0 | 0
Weighted average contingently convertible shares (in shares) | 0 | 39,819 | 0 | 0
Common Stock Warrants |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Weighted average price per share (in us dollar per share) | $ 0 | $ 0.01 | $ 0 | $ 0
Contingently Convertible Shares |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Weighted average price per share (in us dollar per share) | $ 0 | $ 12.32 | $ 0 | $ 0

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