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Senior Notes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified |  |  |  | 0 Months Ended |  | 0 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | May 07, 2008 May 2008 senior notes Y Contract | May 07, 2008 May 2008 senior notes Minimum | May 07, 2008 May 2008 senior notes Maximum | Jul. 14, 2010 July 2010 senior notes Contract Y | Jul. 14, 2010 July 2010 senior notes Minimum | Jul. 14, 2010 July 2010 senior notes Maximum
Debt Disclosure [Line Items] |  |  |  |  |  |  |  |
Senior Notes issued in a private placement to a group of institutional investors |  |  | $ 275 |  |  | $ 245 |  |
Number of series of Senior Notes issued |  |  | 4 |  |  | 4 |  |
Senior Notes, maturity |  |  |  | 5 years | 10 years |  | 6 years | 10 years
Senior Notes, weighted average interest rate |  |  | 7.00% |  |  | 5.20% |  |
Senior Notes, weighted average maturity (in years) |  |  | 8.8 |  |  | 8.0 |  |
Carrying value of Senior Notes | 455.0 | 455.0 |  |  |  |  |  |
Fair value of Senior Notes | $ 462.9 | $ 462.4 |  |  |  |  |  |

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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