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Pension Plans - Fair Value of the Company's Plan Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Fair market value of assets	$ 23,136	$ 23,690	$ 22,499
U.S. Treasury Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair market value of assets	3,729	4,834
Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair market value of assets	545	410
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair market value of assets	14,086	8,231
Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair market value of assets	4,776	3,741
Mutual Funds-Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair market value of assets		6,474
Quoted Prices in Active Markets for Identical Assets (Level1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair market value of assets	18,360	19,949
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	3,729	4,834
Quoted Prices in Active Markets for Identical Assets (Level1) [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair market value of assets	545	410
Quoted Prices in Active Markets for Identical Assets (Level1) [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair market value of assets	14,086	8,231
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
Quoted Prices in Active Markets for Identical Assets (Level1) [Member] | Mutual Funds-Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair market value of assets		6,474
Significant Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair market value of assets	4,776	3,741
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	4,776	3,741
Significant Observable Inputs (Level 2) [Member] | Mutual Funds-Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair market value of assets		0
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
Significant Unobservable Inputs (Level 3) [Member] | Mutual Funds-Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair market value of assets		$ 0

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- Definition

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+ References

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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

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