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Share-based Compensation - Summary of Company's Stock Option Plan Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Options outstanding, Beginning balance	908,000
Number of Shares, Granted	137,000
Number of Shares, Exercised	(350,000)
Number of Shares, Expired	(3,000)
Number of Shares, Options outstanding, Ending balance	692,000
Number of Shares, Options exercisable	435,000
Weighted Average Exercise Price Per Share, Options outstanding, Beginning balance	$ 19.73
Weighted Average Exercise Price Per Share, Granted	30.44
Weighted Average Exercise Price Per Share, Exercised	20.51
Weighted Average Exercise Price Per Share, Expired	16.30
Weighted Average Exercise Price Per Share, Options outstanding, Ending balance	21.48
Weighted Average Exercise Price Per Share, Options exercisable	$ 18.89
Weighted Average Remaining Contractual Life (Years), Options outstanding	6 years 7 months 6 days
Weighted Average Remaining Contractual Life (Years), Options exercisable	5 years
Aggregate Intrinsic Value, Options outstanding	$ 17,345
Aggregate Intrinsic Value, Options exercisable	$ 12,019

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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