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Retirement Plans - Plan's Assets at Fair Value Hierarchy (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | $ 15,183 | $ 15,572 | $ 19,306
Money Market Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | 2,689 |
Common/Collective Trust, Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 12,146 | 3,221 |
Common/Collective Trust, Equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 3,037 | 5,153 |
Common/Collective Trust, Money Market [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | 4,509 |
(Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 15,183 | 15,572 |
(Level 1) [Member] | Money Market Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | 2,689 |
(Level 1) [Member] | Common/Collective Trust, Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 12,146 | 3,221 |
(Level 1) [Member] | Common/Collective Trust, Equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | $ 3,037 | 5,153 |
(Level 1) [Member] | Common/Collective Trust, Money Market [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | 4,509 |
(Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | 0 |
(Level 2) [Member] | Money Market Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | 0 |
(Level 2) [Member] | Common/Collective Trust, Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | 0 |
(Level 2) [Member] | Common/Collective Trust, Equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | 0 |
(Level 2) [Member] | Common/Collective Trust, Money Market [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | 0 |
(Level 3) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | 0 |
(Level 3) [Member] | Money Market Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | 0 |
(Level 3) [Member] | Common/Collective Trust, Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | 0 |
(Level 3) [Member] | Common/Collective Trust, Equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | 0 |
(Level 3) [Member] | Common/Collective Trust, Money Market [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | $ 0 |

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