Stock-Based Compensation - Segregated Disclosure of Options Outstanding (Detail) - $ / shares	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Share-based Payment Arrangement [Abstract]
Option exercise price, minimum (in dollars per share)	$ 15.63
Option exercise price, maximum (in dollars per share)	$ 15.63
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	119,916	238,748
Weighted average exercise price (in dollars per share)	$ 24.08	$ 23.30
Remaining contractual life	2 years 7 months 6 days
Options exercisable (in shares)	119,916
Weighted average exercise price (in dollars per share)	$ 24.08
Less than or equal to $15.63
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	5,965
Weighted average exercise price (in dollars per share)	$ 15.63
Remaining contractual life	1 year 1 month 6 days
Options exercisable (in shares)	5,965
Weighted average exercise price (in dollars per share)	$ 15.63
Greater than $15.63
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	113,951
Weighted average exercise price (in dollars per share)	$ 24.53
Remaining contractual life	2 years 9 months 18 days
Options exercisable (in shares)	113,951
Weighted average exercise price (in dollars per share)	$ 24.53

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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.

+ References

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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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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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