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Common Stock and Treasury Stock - Additional Information (Detail) - USD ($) | 3 Months Ended | 51 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015 | 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 | 2,842,116 | 39,950,633 |  |  |  |  |
Repurchase of common stock, value | $ 56,400,000 | $ 452,200,000 |  |  |  |  |
Maximum |  |  |  |  |  |  |
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 | $ 81,900,000 |  |  |  |  |  |

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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 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 -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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