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Retirement Benefits - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 12 Months Ended |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012 Pension Plans | Sep. 30, 2013 Pension Plans | Dec. 31, 2012 Other Postretirement Benefit Plans | Sep. 30, 2013 Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Expected contribution for next fiscal year |  | $ 7.0 |  | $ 0.9 |
Actual contributions |  |  | 6.0 |  | 0.6
Anticipated additional contribution for pension plans and other postretirement benefit plans in 2013 | $ 0.5 |  |  |  |

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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period. + References No definition available. + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + 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 (g) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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