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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, 2012 | Dec. 31, 2011
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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 | 35.00% |
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 | 33.00% | 34.00%
Plan Assets [Member] | Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, asset allocations | 50.00% | 50.00%
Plan Assets [Member] | Other Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, asset allocations | 17.00% | 16.00%

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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=21915506&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=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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