Share-based Compensation - Summary of Stock Option Transactions under Plans (Detail) - 2013 and 2021 Plan - $ / shares	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, options outstanding at beginning of period (shares)	125,938	156,438	338,338
Number of Shares, Options exercised (shares)			(181,900)
Number of Shares, Options forfeited (shares)	(10,000)	(30,500)
Number of Shares, Options outstanding at end of period (shares)	115,938	125,938	156,438
Number of Shares, Options exercisable at end of period (shares)	115,938	125,938	156,438
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-Average Exercise Price Per Share, Options outstanding at beginning of period (in USD per share)	$ 19.59	$ 18.84	$ 17.52
Weighted-Average Exercise Price Per Share, Options exercised (in USD per share)			16.38
Weighted-Average Exercise Price Per Share, Options forfeited (in USD per share)	19.74	15.73
Weighted-Average Exercise Price Per Share, Options outstanding at end of period (in USD per share)	19.58	19.59	18.84
Weighted-Average Exercise Price Per Share, Options exercisable at end of period (in USD per share)	$ 19.58	$ 19.59	$ 18.84

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

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