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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets at Beginning of Year | $ 125,755 | $ 107,808 |
Actual Return on Plan Assets | 13,024 | 17,908 |
Employer Contributions | 4,665 | 6,916 | $ 16,628
Benefits Paid | (6,038) | (6,877) |
Plan Assets at End of Year | 137,406 | 125,755 | 107,808
PBO at Beginning of Year | 182,135 | 156,197 |
Service Cost | 3,322 | 3,104 | 3,393
Interest Cost | 5,776 | 6,484 | 5,878
Plan Amendments | 732 |  |
Benefits Paid | (6,038) | (6,877) | (4,986)
Actuarial (Gain) or Loss | 20,165 | 23,227 |
PBO at End of Year | 206,092 | 182,135 | 156,197
Funded Status: Assets vs PBO | (68,686) | (56,380) |
Other Postretirement Benefit Plans, Defined Benefit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets at Beginning of Year | 27,280 | 21,109 |
Actual Return on Plan Assets | 3,739 | 3,808 |
Employer Contributions | 4,156 | 4,000 | 4,000
Participant Contributions | 240 | 121 |
Benefits Paid | (2,568) | (1,758) |
Plan Assets at End of Year | 32,847 | 27,280 | 21,109
PBO at Beginning of Year | 95,657 | 81,005 |
Service Cost | 2,698 | 2,304 | 2,933
Interest Cost | 3,121 | 3,426 | 3,404
Benefits Paid | (2,568) | (1,758) | (2,193)
Actuarial (Gain) or Loss | 7,683 | 10,559 |
PBO at End of Year | 106,831 | 95,657 | 81,005
Funded Status: Assets vs PBO | (73,984) | (68,377) |
Supplemental Employee Retirement Plans, Defined Benefit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer Contributions | 654 | 610 | 401
Benefits Paid | (654) | (610) |
PBO at Beginning of Year | 17,759 | 13,754 |
Service Cost | 283 | 247 | 487
Interest Cost | 549 | 567 | 404
Plan Amendments |  | 225 |
Benefits Paid | (654) | (610) | (401)
Actuarial (Gain) or Loss | 2,288 | 3,576 |
PBO at End of Year | 20,225 | 17,759 | $ 13,754
Funded Status: Assets vs PBO | $ (20,225) | $ (17,759) |

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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=118255775&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=118257860&loc=d3e4179-114921 + Details
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