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Stock Option Plan - Stock Options Issued (Detail) | 12 Months Ended
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Dec. 31, 2022 $ / shares | Dec. 31, 2021 $ / shares | Dec. 31, 2020 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercise price (in usd per share) | $ 44.44 | $ 45.07 | $ 49.19
Directors | May, 13 2022 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercise price (in usd per share) | 47.90 |  |
Fair value per option (in usd per share) | $ 8.34 |  |
Volatility | 0.3000 |  |
Expected life (years) | 5 years |  |
Assumed yield | 4.90% |  |
Risk-free rate | 2.89% |  |
Directors | May 7, 2021 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercise price (in usd per share) | $ 43.89 |  |
Fair value per option (in usd per share) | $ 6.32 |  |
Volatility | 0.2970 |  |
Expected life (years) | 5 years |  |
Assumed yield | 4.96% |  |
Risk-free rate | 0.77% |  |
Directors | April 24, 2020 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercise price (in usd per share) | $ 50.00 |  |
Fair value per option (in usd per share) | $ 0.84 |  |
Volatility | 0.2580 |  |
Expected life (years) | 5 years |  |
Assumed yield | 3.80% |  |
Risk-free rate | 0.36% |  |
Officers | May, 13 2022 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercise price (in usd per share) | $ 47.90 |  |
Fair value per option (in usd per share) | $ 7.66 |  |
Volatility | 0.2710 |  |
Expected life (years) | 7 years |  |
Assumed yield | 4.93% |  |
Risk-free rate | 2.95% |  |
Officers | May 7, 2021 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercise price (in usd per share) | $ 43.89 |  |
Fair value per option (in usd per share) | $ 5.96 |  |
Volatility | 0.2750 |  |
Expected life (years) | 7 years |  |
Assumed yield | 4.97% |  |
Risk-free rate | 1.24% |  |
Officers | April 24, 2020 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercise price (in usd per share) | $ 50.00 |  |
Fair value per option (in usd per share) | $ 0.92 |  |
Volatility | 0.2400 |  |
Expected life (years) | 7 years |  |
Assumed yield | 3.85% |  |
Risk-free rate | 0.51% |  |

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- Definition Share Based Compensation Arrangement by Share Based Payment Award, Fair Value Assumptions, Volatility + References No definition available. + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition 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. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(02) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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