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Employee Benefit Plans (Narrative) (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined contribution plan, cost | $ 23,800,000 | $ 17,900,000 |
Percentage of equity investments in mutual fund | 68.00% |  |
Net periodic benefit cost, Expected return on plan assets | 7.25% | 7.25% | 7.25%
Expected defined benefit plans contribution within a year | $ 1,200,000 |  |
Number of stock plans | 3 |  |
Dividends, share-based compensation | $ 0.75 | $ 0.72 | $ 0.71
Weighted-average risk-free interest rate | 0.77% | 0.19% | 1.65%
Options awarded during period | 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 | 777,687 |  |
Base-year adjusted net revenue amount | $ 426,600,000 |  |
Base-year calculation basis point adjustment | 0.30% |  |
Percentage level of achievement - 13 percent average growth | 13.00% |  |
Award payout percentage of target at 50 percent | 50.00% |  |
Percentage level of achievement - 19 percent average growth | 19.00% |  |
Award payout percentage of target at 100 percent | 100.00% |  |
Percentage level of achievement - 25 percent average growth | 25.00% |  |
Award payout percentage of target at 150 percent | 150.00% |  |
Award payout percentage at less than 25th percentile level of achievement | 0.00% |  |
Award payout percentage at the 25th percentile level of achievement | 50.00% |  |
Award payout percentage at the 50th percentile level of achievement | 100.00% |  |
Award payout percentage at the 75th percentile level of achievement | 150.00% |  |
Performance Shares [Member] | Pro Forma [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Granted in period, number of shares/units | 30,723 | 48,409 | 34,317
Equity Securities [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Target asset allocation percentage | 62.00% |  |
Fixed Income Securities [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Target asset allocation percentage | 36.00% |  |
Two Thousand Fifteen Plan [Member] | Stock Options [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Vesting period of options awarded, years | 4 years |  |
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] |  |  |
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 |  |
Minimum [Member] | Performance Shares [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Percentage level of achievement - less than 13 percent average growth | 13.00% |  |
Award payout percentage of target at 0 percent | 0.00% |  |
Maximum [Member] | Performance Shares [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Granted in period, number of shares/units | 46,086 | 72,618 | 51,479
Deferred Profit Sharing [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined contribution plan, cost | $ 0 | $ 0 | $ 0
Other Pension Plan [Member] | Qualified Plan [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Defined contribution plan, cost |  |  | $ 28,900,000
Participants contribution eligible for match | 100.00% |  |
Other Pension Plan [Member] | Qualified Plan [Member] | Minimum [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Maximum annual contributions per employee, percent | 2.00% |  |
Other Pension Plan [Member] | Qualified Plan [Member] | 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% |  |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2919-114920 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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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