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Common Stock and Treasury Stock - Additional Information (Detail) - USD ($) | 9 Months Ended | 36 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014 | Feb. 28, 2014 | Jul. 31, 2013 | Sep. 13, 2012 | Feb. 29, 2012 | Dec. 31, 2011
Maximum stock authorized to purchase under stock repurchase program |  |  |  |  |  | $ 262,100,000 | $ 210,000,000
Increase in maximum stock authorized to purchase under stock repurchase program |  |  | $ 100,000,000 | $ 100,000,000 |  | $ 52,100,000 |
Repurchase of common stock, shares | 0 | 37,108,467 |  |  |  |  |
Repurchase of common stock, value |  | $ 395,800,000 |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Maximum stock authorized to purchase under stock repurchase program |  |  |  |  | $ 113,000,000 |  |
Stock authorized to purchase under stock repurchase program, shares |  |  |  |  | 7,500,000 |  |
Remaining value of shares authorized for purchase under the stock repurchase program | $ 138,300,000 |  |  |  |  |  |

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- Definition The additional amount authorized by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 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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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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