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Employee Benefit Plans - Schedule of Asset Allocation Strategy (Detail) | 12 Months Ended
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Dec. 31, 2012
Domestic Equities [Member] |
Schedule of Trading Securities and Other Trading Assets [Line Items] |
Asset Allocation Strategy, Minimum Allocation Percentage | 14.00%
Asset Allocation Strategy, Maximum Allocation Percentage | 32.00%
Foreign Equities [Member] |
Schedule of Trading Securities and Other Trading Assets [Line Items] |
Asset Allocation Strategy, Minimum Allocation Percentage | 13.00%
Asset Allocation Strategy, Maximum Allocation Percentage | 25.00%
Fixed Income [Member] |
Schedule of Trading Securities and Other Trading Assets [Line Items] |
Asset Allocation Strategy, Minimum Allocation Percentage | 26.00%
Asset Allocation Strategy, Maximum Allocation Percentage | 40.00%
Alternative Strategies [Member] |
Schedule of Trading Securities and Other Trading Assets [Line Items] |
Asset Allocation Strategy, Minimum Allocation Percentage | 6.00%
Asset Allocation Strategy, Maximum Allocation Percentage | 14.00%
Diversifying Assets [Member] |
Schedule of Trading Securities and Other Trading Assets [Line Items] |
Asset Allocation Strategy, Minimum Allocation Percentage | 7.00%
Asset Allocation Strategy, Maximum Allocation Percentage | 19.00%
Cash [Member] |
Schedule of Trading Securities and Other Trading Assets [Line Items] |
Asset Allocation Strategy, Minimum Allocation Percentage | 0.00%
Asset Allocation Strategy, Maximum Allocation Percentage | 5.00%

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- Definition Target allocation maximum percentage 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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- Definition Target allocation minimum percentage 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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