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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
	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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- References

No definition available.

+ Details

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