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Pension Plans - Fair Value of the Company's Plan Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets measured at net asset value | $ 32,658 |  |
Fair market value of assets | 32,658 | $ 28,672 | $ 25,367
Quoted Prices in Active Markets for Identical Assets (Level1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets |  | 24,041 |
Significant Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets |  | 4,631 |
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets |  | 0 |
Pooled Investment Fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets measured at net asset value | $ 32,658 |  |
Cash [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets |  | 462 |
Cash [Member] | Quoted Prices in Active Markets for Identical Assets (Level1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets |  | 462 |
Cash [Member] | Significant Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets |  | 0 |
Cash [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets |  | 0 |
Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets |  | 10,470 |
Equity Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets |  | 10,470 |
Equity Securities [Member] | Significant Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets |  | 0 |
Equity Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets |  | 0 |
U.S. Treasury Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets |  | 13,109 |
U.S. Treasury Bonds [Member] | Quoted Prices in Active Markets for Identical Assets (Level1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets |  | 13,109 |
U.S. Treasury Bonds [Member] | Significant Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets |  | 0 |
U.S. Treasury Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets |  | 0 |
Corporate Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets |  | 4,631 |
Corporate Bonds [Member] | Quoted Prices in Active Markets for Identical Assets (Level1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets |  | 0 |
Corporate Bonds [Member] | Significant Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets |  | 4,631 |
Corporate Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets |  | $ 0 |

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