v2.4.0.6

Subsequent Events - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended |  |  | 1 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Feb. 01, 2013 Subsequent Event [Member] | Feb. 04, 2013 Subsequent Event [Member]
Subsequent Event [Line Items] |  |  |  |  |
Debt instrument offering date |  |  |  | Feb. 01, 2013 |
Aggregate principal amount |  | $ 3,470.0 | $ 3,033.0 | $ 500.0 |
Secondary offering of common stock | 30,000,000 |  |  |  | 30,000,000
Public offering of common stock, price per share | $ 30.00 |  |  |  | $ 30.35
Percentage of common shares held by stockholders |  |  |  |  | 42.00%
Secondary offering of common shares, closing date |  |  |  |  | February 7, 2013
Debt instrument, interest rate |  |  |  | 5.75% |
Debt instrument, due date |  |  |  | 2021 |

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- Definition Debt Instruments Maturity Year + References No definition available. + Details
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Balance Type: | na
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- Definition Percentage Of Interest Owned By Related Party + References No definition available. + Details
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- Definition Secondary Offering Common Stock Price Per Share + References No definition available. + Details
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- Definition Secondary Offering Of Common Stock + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Stock Offering Date + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Interest rate stated in the contractual debt agreement. + 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)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date the debt instrument was offered for sale, 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 + Details
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- Details
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