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Share Repurchases - Additional Information (Detail) (USD $) In Millions, except Share data in Thousands, unless otherwise specified | 12 Months Ended | 3 Months Ended | 6 Months Ended | 24 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Jun. 30, 2013 Share Repurchase Program [Member] | Jun. 30, 2013 Share Repurchase Program [Member] | Jun. 30, 2013 Share Repurchase Program [Member]
Shares Repurchased [Line Items] |  |  |  |  |
Purchase of common stock | $ 200.0 | $ 150.0 |  |  |
Repurchase of shares |  |  | 600 | 1,200 | 4,900
Prepaid variable agreement cost |  |  | $ 31.3 | $ 62.5 | $ 187.5
Repurchase of shares average price per share |  |  | $ 53.49 | $ 52.21 | $ 38.23

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- Definition Stock Repurchases Program Cumulative Amount Repurchased + References No definition available. + Details
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- Definition Amount of a stock repurchase plan authorized by an entity's Board of Directors. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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