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Pension Plans - Fair Value of the Company's Plan Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | $ 24,435 | $ 23,136 | $ 23,690
U.S. Treasury Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 3,893 | 3,729 |
Cash [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 1,042 | 545 |
Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 14,814 | 14,086 |
Corporate Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 4,686 | 4,776 |
Quoted Prices in Active Markets for Identical Assets (Level1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 19,749 | 18,360 |
Quoted Prices in Active Markets for Identical Assets (Level1) [Member] | U.S. Treasury Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 3,893 | 3,729 |
Quoted Prices in Active Markets for Identical Assets (Level1) [Member] | Cash [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 1,042 | 545 |
Quoted Prices in Active Markets for Identical Assets (Level1) [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 14,814 | 14,086 |
Quoted Prices in Active Markets for Identical Assets (Level1) [Member] | Corporate Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 0 | 0 |
Significant Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 4,686 | 4,776 |
Significant Observable Inputs (Level 2) [Member] | U.S. Treasury Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 0 | 0 |
Significant Observable Inputs (Level 2) [Member] | Cash [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 0 | 0 |
Significant Observable Inputs (Level 2) [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 0 | 0 |
Significant Observable Inputs (Level 2) [Member] | Corporate Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 4,686 | 4,776 |
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) [Member] | U.S. Treasury Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Cash [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Corporate Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair market value of assets | $ 0 | $ 0 |

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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=64937038&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=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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