Stock Options and Other Equity-Based Incentive Instruments - Stock Option Activity (Detail) - $ / shares	3 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at December 31, 2019 (in shares)	160,500
Options granted (in shares)	0
Options exercised (in shares)	(8,000)
Options forfeited (in shares)	0
Options outstanding at March 31, 2020 (in shares)	152,500
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)	18.50
Weighted Average Exercise Price of Options Forfeited (in USD per share)	0
Weighted Average Exercise Price at March 31, 2020 (in USD per share)	17.55
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)	17.54
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

Share based compensation arrangements by share based payment award options outstanding option price per share.

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

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

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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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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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- Definition

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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Number of share options (or share units) exercised during the current period.

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