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Retirement Plans - Plan's Assets at Fair Value Hierarchy (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | $ 15,647 | $ 16,184 | $ 15,466
Supplemental Retirement Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 15,647 |  |
Supplemental Retirement Plan [Member] | Cash [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | 3 |
Supplemental Retirement Plan [Member] | Money Market Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 94 | 91 |
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 | 6,315 | 6,383 |
Supplemental Retirement Plan [Member] | Equity Market Funds, Commodity Mutual Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | 19 |
Supplemental Retirement Plan [Member] | Equity Market Funds, International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 357 | 342 |
Supplemental Retirement Plan [Member] | Equity Market Funds, Large Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 1,155 | 1,150 |
Supplemental Retirement Plan [Member] | Equity Market Funds, Mid Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 242 | 253 |
Supplemental Retirement Plan [Member] | Equity Market Funds, Small Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 123 | 118 |
Supplemental Retirement Plan [Member] | Common/Collective Trust, Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 7,338 | 7,802 |
(Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | 16,184 |
(Level 1) [Member] | Supplemental Retirement Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 15,647 |  |
(Level 1) [Member] | Supplemental Retirement Plan [Member] | Cash [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | 3 |
(Level 1) [Member] | Supplemental Retirement Plan [Member] | Money Market Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 94 | 91 |
(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 | 6,315 | 6,383 |
(Level 1) [Member] | Supplemental Retirement Plan [Member] | Equity Market Funds, Commodity Mutual Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value |  | 19 |
(Level 1) [Member] | Supplemental Retirement Plan [Member] | Equity Market Funds, International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 357 | 342 |
(Level 1) [Member] | Supplemental Retirement Plan [Member] | Equity Market Funds, Large Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 1,155 | 1,150 |
(Level 1) [Member] | Supplemental Retirement Plan [Member] | Equity Market Funds, Mid Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 242 | 253 |
(Level 1) [Member] | Supplemental Retirement Plan [Member] | Equity Market Funds, Small Cap [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | 123 | 118 |
(Level 1) [Member] | Supplemental Retirement Plan [Member] | Common/Collective Trust, Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets at fair value | $ 7,338 | $ 7,802 |

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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