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Employee Benefit Plans - Plan Assets Measured and Reported in Financial Statements at Fair Value (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 435,274 | $ 475,940
Collective trust funds | US equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 86,466 | 174,027
Collective trust funds | International equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 255,694 | 166,432
Collective trust funds | International fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 44,118 | 47,260
US government and US government agency securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,540 | 36,531
US corporate debt instruments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 31,254 | 24,628
International corporate debt instruments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 5,612 | 4,700
Mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 567 | 15,561
Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 10,023 | 6,801
Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 567 | 561
Level 1 | Collective trust funds | US equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 1 | Collective trust funds | International equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 1 | Collective trust funds | International fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 1 | US government and US government agency securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 1 | US corporate debt instruments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 1 | International corporate debt instruments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 1 | Mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 567 | 561
Level 1 | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 434,707 | 475,379
Level 2 | Collective trust funds | US equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 86,466 | 174,027
Level 2 | Collective trust funds | International equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 255,694 | 166,432
Level 2 | Collective trust funds | International fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 44,118 | 47,260
Level 2 | US government and US government agency securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,540 | 36,531
Level 2 | US corporate debt instruments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 31,254 | 24,628
Level 2 | International corporate debt instruments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 5,612 | 4,700
Level 2 | Mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 15,000
Level 2 | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 10,023 | 6,801
Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 3 | Collective trust funds | US equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 3 | Collective trust funds | International equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 3 | Collective trust funds | International fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 3 | US government and US government agency securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 3 | US corporate debt instruments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 3 | International corporate debt instruments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 3 | Mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 0
Level 3 | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 0 | $ 0

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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=29635418&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=35743120&loc=d3e1928-114920 + Details
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