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Summary of Information on Plans' Assets, Projected Benefit Obligations (PBO), and Funded Status (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets at Beginning of Year | $ 152,006 | $ 137,406 |
Actual Return on Plan Assets | (19,984) | 16,989 |
Employer Contributions | 3,800 | 4,100 | $ 4,665
Benefits Paid | (9,724) | (6,489) |
Plan Assets at End of Year | 126,098 | 152,006 | 137,406
PBO at Beginning of Year | 199,418 | 206,092 |
Service Cost | 3,165 | 3,472 | 3,322
Interest Cost | 5,486 | 5,003 | 5,776
Plan Amendments |  | 674 |
Benefits Paid | (9,724) | (6,489) | (6,038)
Actuarial (Gain) or Loss | (51,392) | (9,334) |
PBO at End of Year | 146,953 | 199,418 | 206,092
Funded Status: Assets vs PBO | (20,855) | (47,412) |
Other Postretirement Benefit Plans, Defined Benefit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets at Beginning of Year | 42,651 | 32,847 |
Actual Return on Plan Assets | (6,810) | 3,586 |
Employer Contributions | 12,153 | 8,903 | 4,156
Participant Contributions | 279 | 220 |
Benefits Paid | (3,503) | (2,905) |
Plan Assets at End of Year | 44,770 | 42,651 | 32,847
PBO at Beginning of Year | 112,087 | 106,831 |
Service Cost | 2,890 | 3,034 | 2,698
Interest Cost | 3,194 | 2,740 | 3,121
Benefits Paid | (3,503) | (2,905) | (2,568)
Actuarial (Gain) or Loss | (58,437) | 2,167 |
PBO at End of Year | 56,510 | 112,087 | 106,831
Funded Status: Assets vs PBO | (11,740) | (69,436) |
Supplemental Employee Retirement Plans, Defined Benefit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer Contributions | 637 | 637 | 654
Benefits Paid | (637) |  |
PBO at Beginning of Year | 17,714 | 20,225 |
Service Cost | 273 | 354 | 283
Interest Cost | 472 | 458 | 549
Benefits Paid | (637) | (637) | (654)
Actuarial (Gain) or Loss | (3,012) | (2,686) |
PBO at End of Year | 14,810 | 17,714 | $ 20,225
Funded Status: Assets vs PBO | $ (14,810) | $ (17,714) |

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 (b)(1) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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