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Long-Term Debt - Additional Information (Detail) (USD $) | 3 Months Ended |  |  | 0 Months Ended | 2 Months Ended |  | 2 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Feb. 07, 2014 | Dec. 31, 2013 | Feb. 07, 2014 Revolving Credit Facility | Mar. 31, 2014 Revolving Credit Facility | Sep. 22, 2011 Revolving Credit Facility | Mar. 31, 2014 Revolving Credit Facility Minimum | Mar. 31, 2014 Revolving Credit Facility Maximum | Dec. 31, 2005 5.10% Senior Notes | Jan. 20, 2005 5.10% Senior Notes
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 750,000,000 |  | $ 750,000,000 |  |  |  |
Additional borrowing capacity |  | 250,000,000 |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 1.00% |  | 0.90% | 1.50% |  |
Commercial paper notes | 363,000,000 |  | 363,000,000 |  |  |  |  |  |  |
Weighted average interest rate | 0.23% |  |  |  |  |  |  |  |  |
Weighted average maturity period | 22 days |  |  | 5 years |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  | $ 325,000,000.0
Maturity date |  |  |  |  |  |  |  |  | Feb. 01, 2015 |

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- Definition Carrying value as of the balance sheet date of long-term unsecured obligations issued by corporations and other borrowers to investors (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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