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Schedule of Target Asset Allocation (Detail) | 12 Months Ended
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Dec. 31, 2012
Passive And Active Fixed Income | Barclays Capital Long Government Credit Index | Fixed Income Funds |
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items] |
Target assets allocation percentage | 85.00%
Equity (Large Cap) | S&P 500 Stock Index | Equity Securities |
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items] |
Target assets allocation percentage | 10.00%
International Equity | MSCI EAFE Index (Net Dividends) | Equity Securities |
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items] |
Target assets allocation percentage | 5.00%

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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920 + Details
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