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Employee Benefit Plans - Plan Assets Measured and Reported in Financial Statements at Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 433,780	$ 435,274
US government and US government agency securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,568	1,540
US corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	33,787	31,254
International corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,689	5,612
Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	582	567
Money market funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,531
Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,640	10,023
Collective trust funds | US corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	96,487	86,466
Collective trust funds | International corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	239,177	255,694
Collective trust funds | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	44,319	44,118
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,113	567
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	582	567
Level 1 | Money market funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,531
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	50,684	48,429
Level 2 | US government and US government agency securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,568	1,540
Level 2 | US corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	33,787	31,254
Level 2 | International corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,689	5,612
Level 2 | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 2 | Money market funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 2 | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,640	10,023
Level 3
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 | Money market funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Level 3 | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0

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- Definition

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+ References

No definition available.

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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

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