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Pension and Other Post-Retirement Benefits And Employee Benefits - Retirement Plan, Based on Measurement Date (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Change in Plan Assets: |  |  |  |  |  |  |
Fair value of assets at beginning of year | $ 261,030 |  |  |  |  |  |
Fair value of assets at end of year |  |  |  |  | $ 261,030 |  |
Pension Benefits |  |  |  |  |  |  |
Change in Benefit Obligation: |  |  |  |  |  |  |
Benefit obligation at beginning of year | 172,132 |  | $ 159,896 |  | 159,896 | $ 143,235 |
Interest cost | 912 | [1] | 1,173 | [1] | 4,692 | 5,660 | $ 5,085
Actuarial loss (gain) |  |  |  |  | 14,629 | 18,806 |
Annuity payments |  |  |  |  | (6,510) | (6,473) |
Settlements |  |  |  |  | (575) | (1,332) |
Benefit obligation at end of year |  |  |  |  | 172,132 | 159,896 | 143,235
Change in Plan Assets: |  |  |  |  |  |  |
Fair value of assets at beginning of year | $ 261,030 |  | $ 242,558 |  | 242,558 | 210,246 |
Actual return (loss) on plan assets |  |  |  |  | 25,557 | 40,117 |
Annuity payments |  |  |  |  | (6,510) | (6,473) |
Settlements |  |  |  |  | (575) | (1,332) |
Fair value of assets at end of year |  |  |  |  | 261,030 | 242,558 | $ 210,246
Funded status (included in "Other assets") |  |  |  |  | 88,898 | 82,662 |
Changes recognized in other comprehensive income for the year ended December 31: |  |  |  |  |  |  |
Amortization of actuarial loss |  |  |  |  | (7,327) | (10,035) |
Net actuarial (gain) loss arising during the year |  |  |  |  | 4,577 | (7,378) |
Total recognized in other comprehensive income for the year (pre-tax) |  |  |  |  | (2,750) | (17,413) |
Accumulated other comprehensive loss (pre-tax) not yet recognized in net periodic benefit cost at December 31: |  |  |  |  |  |  |
Actuarial loss, net |  |  |  |  | 73,017 | 75,767 |
Total accumulated other comprehensive loss (pre-tax) |  |  |  |  | $ 73,017 | $ 75,767 |
[1] | Amounts are included in G&A expense on the Consolidated Statements of Income and Comprehensive Income.

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