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Summary of Significant Accounting Policies - Weighted Average Shares of Unvested Restricted Stock (Detail) - shares shares in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Accounting Policies [Abstract] |  |  |  |
Unvested restricted stock (in shares) | 1,285 | 758 | 1,185 | 539

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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
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