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Retirement Plans - Plan's Assets at Fair Value Hierarchy (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | $ 16,150 | $ 15,647 | $ 16,184
Supplemental Retirement Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 16,150 | 15,647 |
Supplemental Retirement Plan [Member] | Money Market Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 64 | 94 |
Supplemental Retirement Plan [Member] | Bond Mutual Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 23 | 23 |
Supplemental Retirement Plan [Member] | Common/Collective Trust, Equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 5,593 | 6,315 |
Supplemental Retirement Plan [Member] | Equity Market Funds, International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 399 | 357 |
Supplemental Retirement Plan [Member] | Equity Market Funds, Large Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 1,023 | 1,155 |
Supplemental Retirement Plan [Member] | Equity Market Funds, Mid Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 282 | 242 |
Supplemental Retirement Plan [Member] | Equity Market Funds, Small Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 376 | 123 |
Supplemental Retirement Plan [Member] | Common/Collective Trust, Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 8,390 | 7,338 |
(Level 1) [Member] | Supplemental Retirement Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 16,086 | 15,553 |
(Level 1) [Member] | Supplemental Retirement Plan [Member] | Bond Mutual Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 23 | 23 |
(Level 1) [Member] | Supplemental Retirement Plan [Member] | Common/Collective Trust, Equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 5,593 | 6,315 |
(Level 1) [Member] | Supplemental Retirement Plan [Member] | Equity Market Funds, International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 399 | 357 |
(Level 1) [Member] | Supplemental Retirement Plan [Member] | Equity Market Funds, Large Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 1,023 | 1,155 |
(Level 1) [Member] | Supplemental Retirement Plan [Member] | Equity Market Funds, Mid Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 282 | 242 |
(Level 1) [Member] | Supplemental Retirement Plan [Member] | Equity Market Funds, Small Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 376 | 123 |
(Level 1) [Member] | Supplemental Retirement Plan [Member] | Common/Collective Trust, Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 8,390 | 7,338 |
(Level 2) [Member] | Supplemental Retirement Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 64 | 94 |
(Level 2) [Member] | Supplemental Retirement Plan [Member] | Money Market Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | $ 64 | $ 94 |

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