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Pension and Other Postretirement Benefits - Schedule of Pension and Postretirement Plans Investment Policy and Weighted Average Asset Allocations (Detail) | Dec. 31, 2013 | Dec. 31, 2012
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Equity Securities [Member] | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, asset allocations | 55.00% |
Equity Securities [Member] | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, asset allocations | 20.00% |
Fixed Income Securities [Member] | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, asset allocations | 55.00% |
Fixed Income Securities [Member] | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, asset allocations | 25.00% |
Other Investments [Member] | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, asset allocations | 55.00% |
Other Investments [Member] | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, asset allocations | 15.00% |
Plan Assets [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, asset allocations | 100.00% | 100.00%
Plan Assets [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, asset allocations | 37.00% | 33.00%
Plan Assets [Member] | Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, asset allocations | 41.00% | 50.00%
Plan Assets [Member] | Other Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, asset allocations | 22.00% | 17.00%

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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=28361610&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=28361610&loc=d3e1928-114920 + Details
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