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Employee Benefit Plans (Fair Value of Plan Assets) (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | $ 174,611 | $ 161,823 | $ 197,747 | $ 182,088
Mutual Fund [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 38,793 | 154,391 |  |
US Treasury [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 26,633 | 0 |  |
Common Stock [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 13,001 | 0 |  |
Cash and Cash Equivalents [Member] | Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 1,241 | 7,432 |  |
Corporate Bond Securities [Member] | Level 2 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 58,669 | 0 |  |
US Government Agencies Debt Securities [Member] | Level 2 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | 7,041 | 0 |  |
States and Political Subdivisions [Member] | Level 2 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | $ 29,233 | $ 0 |  |

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