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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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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

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