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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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Defined benefit plan assets net asset value.

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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