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Employee Benefit Plans - Plan Assets Measured and Reported in Financial Statements at Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 460,952	$ 433,780
U.S. government and U.S. government agency securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,101	1,568
U.S. corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	37,323	33,787
International corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11,137	8,689
Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	611	582
Money market funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,975	2,531
Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,968	6,640
Insurance buy-in policy
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	33,553
Collective trust funds | U.S. equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	73,727	96,487
Collective trust funds | International equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	234,472	239,177
Collective trust funds | International fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	16,179	44,319
Collective trust funds | Diversified funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	39,906
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,586	3,113
Level 1 | U.S. government and U.S. government agency securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | U.S. 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	611	582
Level 1 | Money market funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,975	2,531
Level 1 | Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Insurance buy-in policy
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	60,529	50,684
Level 2 | U.S. government and U.S. government agency securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,101	1,568
Level 2 | U.S. corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	37,323	33,787
Level 2 | International corporate debt instruments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11,137	8,689
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	0
Level 2 | Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,968	6,640
Level 2 | Insurance buy-in policy
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	33,553	0
Level 3 | U.S. government and U.S. government agency securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | U.S. 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	0	0
Level 3 | Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	$ 0
Level 3 | Insurance buy-in policy
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 33,553

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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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