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Summary of Significant Accounting Policies - Weighted Average Shares of Unvested Restricted Stock (Detail) - shares shares in Thousands | 5 Months Ended | 7 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Aug. 13, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Accounting Policies [Abstract] |  |  |  |
Unvested restricted stock | 410 | 839 | 1,149 | 685

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- Definition Share based compensation arrangement by share based payment award equity instruments other than option nonvested weighted average number. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration