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Pension Plans - Weighted-Average Asset Allocations of Plan Assets (Detail) | Dec. 31, 2015 | Dec. 31, 2014
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Defined Benefit Plan Disclosure [Line Items] |  |
Weighted-average asset allocations of pension plan assets | 100.00% | 100.00%
Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Weighted-average asset allocations of pension plan assets | 61.00% | 62.00%
Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Weighted-average asset allocations of pension plan assets | 37.00% | 36.00%
Cash and Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Weighted-average asset allocations of pension plan assets | 2.00% | 2.00%

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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. + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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