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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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- 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 + Details
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