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Benefit Plans - Assets Measured at Fair Value on Recurring Basis (Detail) - Pension - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | $ 54,617 | $ 49,932 | $ 43,449 | $ 46,870
Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 34,901 | 24,636 |  |
Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 19,716 | 25,296 |  |
Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 0 | 0 |  |
Group annuity contracts |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 64 | 81 |  |
Group annuity contracts | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 0 | 0 |  |
Group annuity contracts | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 64 | 81 |  |
Group annuity contracts | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 0 | 0 |  |
Mutual funds |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 34,901 | 24,636 |  |
Mutual funds | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 34,901 | 24,636 |  |
Mutual funds | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 0 | 0 |  |
Mutual funds | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 0 | 0 |  |
Fixed income |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 25,418 | 16,609 |  |
Fixed income | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 25,418 | 16,609 |  |
Fixed income | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 0 | 0 |  |
Fixed income | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 0 | 0 |  |
International equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 6,581 | 5,535 |  |
International equity | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 6,581 | 5,535 |  |
International equity | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 0 | 0 |  |
International equity | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 0 | 0 |  |
Large US equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 1,677 | 1,496 |  |
Large US equity | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 1,677 | 1,496 |  |
Large US equity | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 0 | 0 |  |
Large US equity | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 0 | 0 |  |
Small/Mid U.S. equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 1,225 | 996 |  |
Small/Mid U.S. equity | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 1,225 | 996 |  |
Small/Mid U.S. equity | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 0 | 0 |  |
Small/Mid U.S. equity | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 0 | 0 |  |
Pooled Separate Accounts |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 19,652 | 25,215 |  |
Pooled Separate Accounts | Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 0 | 0 |  |
Pooled Separate Accounts | Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | 19,652 | 25,215 |  |
Pooled Separate Accounts | Level 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total investments | $ 0 | $ 0 |  |

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