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Employee Benefit Plans (Narrative) (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Percentage of equity investments in mutual fund | 85.00% |  |
Net periodic benefit cost, Expected return on plan assets | 7.00% | 7.25% | 7.25%
Expected defined benefit plans contribution within a year | $ 1,100,000 |  |
Participants contribution eligible for match | 100.00% |  |
Defined contribution plan, cost | $ 32,300,000 | $ 28,000,000 | $ 23,800,000
Number of stock plans | 3 |  |
Dividends, share-based compensation | $ 0.92 | $ 0.87 | $ 0.75
Weighted-average risk-free interest rate | 5.01% | 4.45% | 0.77%
Options awarded during period | 0 | 0 | 0
Performance Shares [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, number of shares available for grant | 205,090 |  |
Performance Shares [Member] | Pro Forma [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Granted in period, number of shares/units | 66,471 | 35,015 | 30,723
Equity Securities [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Target asset allocation percentage | 31.00% |  |
Fixed Income Securities [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Target asset allocation percentage | 63.00% |  |
Two Thousand Fifteen Plan [Member] | Stock Options [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 10 years |  |
Vesting period of options awarded, years | 4 years |  |
Two Thousand Fifteen Plan [Member] | Non Vested Stock Awards and Stock Units [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 10 years |  |
Two Thousand Fifteen Plan [Member] | Non Vested Stock Awards and Stock Units [Member] | 2021 |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Vesting period of options awarded, years | 3 years |  |
Two Thousand Fifteen Plan [Member] | Non Vested Stock Awards and Stock Units [Member] | Prior to 2021 |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Vesting period of options awarded, years | 4 years |  |
Two Thousand Fifteen Plan [Member] | Non Vested Stock Awards and Stock Units [Member] | 2023 |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Vesting period of options awarded, years | 3 years |  |
Two Thousand Fifteen Plan [Member] | Non Vested Stock Awards and Stock Units [Member] | 2022 |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Vesting period of options awarded, years | 3 years |  |
Minimum [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Maximum annual contributions per employee, percent | 2.00% |  |
Maximum [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Maximum annual contributions per employee, percent | 50.00% |  |
Employer matching contribution, percent of employees' gross pay | 6.00% |  |
Maximum [Member] | Performance Shares [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Granted in period, number of shares/units | 99,710 | 52,527 | 46,086

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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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