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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets at Beginning of Year | $ 137,406 | $ 125,755 |
Actual Return on Plan Assets | 16,989 | 13,024 |
Employer Contributions | 4,100 | 4,665 | $ 6,916
Benefits Paid | (6,489) | (6,038) |
Plan Assets at End of Year | 152,006 | 137,406 | 125,755
PBO at Beginning of Year | 206,092 | 182,135 |
Service Cost | 3,472 | 3,322 | 3,104
Interest Cost | 5,003 | 5,776 | 6,484
Plan Amendments | 674 | 732 |
Benefits Paid | (6,489) | (6,038) | (6,877)
Actuarial (Gain) or Loss | (9,334) | 20,165 |
PBO at End of Year | 199,418 | 206,092 | 182,135
Funded Status: Assets vs PBO | (47,412) | (68,686) |
Other Postretirement Benefit Plans, Defined Benefit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets at Beginning of Year | 32,847 | 27,280 |
Actual Return on Plan Assets | 3,586 | 3,739 |
Employer Contributions | 8,903 | 4,156 | 4,000
Participant Contributions | 220 | 240 |
Benefits Paid | (2,905) | (2,568) |
Plan Assets at End of Year | 42,651 | 32,847 | 27,280
PBO at Beginning of Year | 106,831 | 95,657 |
Service Cost | 3,034 | 2,698 | 2,304
Interest Cost | 2,740 | 3,121 | 3,426
Benefits Paid | (2,905) | (2,568) | (1,758)
Actuarial (Gain) or Loss | 2,167 | 7,683 |
PBO at End of Year | 112,087 | 106,831 | 95,657
Funded Status: Assets vs PBO | (69,436) | (73,984) |
Supplemental Employee Retirement Plans, Defined Benefit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer Contributions | 637 | 654 | 610
Benefits Paid | (637) | (654) |
PBO at Beginning of Year | 20,225 | 17,759 |
Service Cost | 354 | 283 | 247
Interest Cost | 458 | 549 | 567
Benefits Paid | (637) | (654) | (610)
Actuarial (Gain) or Loss | (2,686) | 2,288 |
PBO at End of Year | 17,714 | 20,225 | $ 17,759
Funded Status: Assets vs PBO | $ (17,714) | $ (20,225) |

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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 http://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 http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123453770&loc=d3e1703-114919 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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