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Stock Options and Other Equity-Based Incentive Instruments - Stock Option Activity (Detail)	9 Months Ended
	Sep. 30, 2020 $ / shares shares	Dec. 31, 2019 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at December 31, 2019 (in shares) | shares	160,500
Options granted (in shares) | shares	0
Options exercised (in shares) | shares	(32,000)
Options forfeited (in shares) | shares	0
Options outstanding at September 30, 2020 (in shares) | shares	128,500
Share based compensation arrangements by share based payment award options outstanding option price per share of options granted (in USD per share)	$ 0
Share based compensation arrangements by share based payment award options outstanding option price per share of options forfeited (in USD per share)	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Price at December 31, 2019 (in USD per share)	17.60
Weighted Average Exercise Price of Options Granted (in USD per share)	0
Weighted Average Exercise Price of Options Exercised (in USD per share)	17.10
Weighted Average Exercise Price of Options Forfeited (in USD per share)	0
Weighted Average Exercise Price at September 30, 2020 (in USD per share)	17.72
Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share based compensation arrangements by share based payment award options outstanding option price per share (in USD per share)	14.54	$ 14.54
Share based compensation arrangements by share based payment award options outstanding option price per share of options exercised (in USD per share)	14.54
Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share based compensation arrangements by share based payment award options outstanding option price per share (in USD per share)	23.21	$ 23.21
Share based compensation arrangements by share based payment award options outstanding option price per share of options exercised (in USD per share)	$ 19.46

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Share Based Compensation Arrangements By Share Based Payment Award Options Outstanding Option Price Per Share of Options Exercised

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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 that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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