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Pension and Employee Benefit Plans - Disclosure of Fair Value Measurements of Pension Plan Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Pension assets, at fair value | $ 24,063 | $ 25,296
Equity Securities [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Pension assets, at fair value | 16,153 | 13,187
Debt Securities [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Pension assets, at fair value | 7,016 | 5,712
Level 1 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Pension assets, at fair value | 24,063 | 25,296
Level 1 [Member] | Equity Securities [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Pension assets, at fair value | 16,153 | 13,187
Level 1 [Member] | Debt Securities [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Pension assets, at fair value | 7,016 | 5,712
Cash and cash equivalents [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Pension assets, at fair value | 894 | 6,397
Cash and cash equivalents [Member] | Level 1 [Member] |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |
Pension assets, at fair value | $ 894 | $ 6,397

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- Definition Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] + References No definition available. + Details
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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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