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Stock-Based Compensation (Detail) - (Table 3) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Proceeds from stock options exercised	$ 409	$ 0	$ 7,232	$ 960
Intrinsic value of stock options exercised	$ 265	$ 0	$ 6,077	$ 758

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2A
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-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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