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Retirement Plans - Plan's Assets at Fair Value Hierarchy (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | $ 15,572 | $ 19,306 | $ 16,150
Money Market Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 2,689 |  |
Bond Mutual Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 23 |
Common/Collective Trust, Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 3,221 | 9,980 |
Common/Collective Trust, Equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 5,153 | 6,654 |
Common/Collective Trust, Money Market [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 4,509 |  |
Equity Market Funds, International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 750 |
Equity Market Funds, Large Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 1,085 |
Equity Market Funds, Mid Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 269 |
Equity Market Funds, Small Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 432 |
Cash [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | 113 |
(Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 15,572 | 19,306 |
(Level 1) [Member] | Money Market Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 2,689 |  |
(Level 1) [Member] | Bond Mutual Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 23 |
(Level 1) [Member] | Common/Collective Trust, Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 3,221 | 9,980 |
(Level 1) [Member] | Common/Collective Trust, Equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 5,153 | 6,654 |
(Level 1) [Member] | Common/Collective Trust, Money Market [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 4,509 |  |
(Level 1) [Member] | Equity Market Funds, International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 750 |
(Level 1) [Member] | Equity Market Funds, Large Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 1,085 |
(Level 1) [Member] | Equity Market Funds, Mid Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 269 |
(Level 1) [Member] | Equity Market Funds, Small Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 | 432 |
(Level 1) [Member] | Cash [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | $ 113 |
(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] | Bond Mutual 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 2) [Member] | Equity Market Funds, International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 |  |
(Level 2) [Member] | Equity Market Funds, Large Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 |  |
(Level 2) [Member] | Equity Market Funds, Mid Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 |  |
(Level 2) [Member] | Equity Market Funds, Small Cap [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] | Bond Mutual 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 |  |
(Level 3) [Member] | Equity Market Funds, International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 |  |
(Level 3) [Member] | Equity Market Funds, Large Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 |  |
(Level 3) [Member] | Equity Market Funds, Mid Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 0 |  |
(Level 3) [Member] | Equity Market Funds, Small Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | $ 0 |  |

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