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Share-based Compensation - Summary of Stock Options Outstanding under Plans (Detail) - $ / shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
2007 and 2013 Plan |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Number of Shares (shares) | 125,938 | 156,438 | 338,338 | 364,088
Options Outstanding, Weighted-Average Exercise Price Per Share (in USD per share) | $ 19.59 | $ 18.84 | $ 17.52 | $ 17.86
Options Exercisable, Number of Shares (shares) | 125,938 | 156,438 | 338,338 |
Options Exercisable, Weighted-Average Exercise Price Per Share (in USD per share) | $ 19.59 | $ 18.84 | $ 17.52 |
Intrinsic value of stock options outstanding (in USD per share) | 11.34 |  |  |
$10.80 to $14.99 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise Price Range, Lower Limit (in USD per share) | 10.80 |  |  |
Exercise Price Range, Upper Limit (in USD per share) | $ 14.99 |  |  |
$10.80 to $14.99 | 2007 and 2013 Plan |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Number of Shares (shares) | 4,938 |  |  |
Options Outstanding, Weighted-Average Exercise Price Per Share (in USD per share) | $ 12.54 |  |  |
Options Outstanding, Weighted-Average Remaining Contractual Life | 1 year 11 months 12 days |  |  |
Options Exercisable, Number of Shares (shares) | 4,938 |  |  |
Options Exercisable, Weighted-Average Exercise Price Per Share (in USD per share) | $ 12.54 |  |  |
Options Exercisable, Weighted-Average Remaining Contractual Life | 1 year 11 months 12 days |  |  |
$15.00 to $19.99 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise Price Range, Lower Limit (in USD per share) | $ 15.00 |  |  |
Exercise Price Range, Upper Limit (in USD per share) | $ 19.99 |  |  |
$15.00 to $19.99 | 2007 and 2013 Plan |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Number of Shares (shares) | 50,000 |  |  |
Options Outstanding, Weighted-Average Exercise Price Per Share (in USD per share) | $ 16.43 |  |  |
Options Outstanding, Weighted-Average Remaining Contractual Life | 2 years 7 months 28 days |  |  |
Options Exercisable, Number of Shares (shares) | 50,000 |  |  |
Options Exercisable, Weighted-Average Exercise Price Per Share (in USD per share) | $ 16.43 |  |  |
Options Exercisable, Weighted-Average Remaining Contractual Life | 2 years 7 months 28 days |  |  |
$20.00 to $24.83 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise Price Range, Lower Limit (in USD per share) | $ 20.00 |  |  |
Exercise Price Range, Upper Limit (in USD per share) | $ 24.83 |  |  |
$20.00 to $24.83 | 2007 and 2013 Plan |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Number of Shares (shares) | 71,000 |  |  |
Options Outstanding, Weighted-Average Exercise Price Per Share (in USD per share) | $ 22.31 |  |  |
Options Outstanding, Weighted-Average Remaining Contractual Life | 3 years 10 months 2 days |  |  |
Options Exercisable, Number of Shares (shares) | 71,000 |  |  |
Options Exercisable, Weighted-Average Exercise Price Per Share (in USD per share) | $ 22.31 |  |  |
Options Exercisable, Weighted-Average Remaining Contractual Life | 3 years 10 months 2 days |  |  |

X
- Definition The excess of the closing stock price on the last day of the trading period over the exercise price. + References No definition available. + Details
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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 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock 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 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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. + 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 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + 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 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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