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Share Repurchases - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions | 12 Months Ended | 54 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015 | Nov. 30, 2012 | Jul. 31, 2011
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Purchase of common stock |  |  |  |  | $ 200,000,000 | $ 150,000,000
Payments under share repurchase program | $ 39,053,000 | $ 92,197,000 | $ 93,750,000 |  |  |
Share Repurchase Plan 2011 [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Payments under share repurchase program | $ 39,100,000 | $ 92,200,000 | $ 93,800,000 | $ 350,000,000 |  |
Repurchase of shares | 0.7 | 1.3 | 1.7 | 7.4 |  |
Repurchase of shares average price per share | $ 55.95 | $ 73.06 | $ 54.76 | $ 47.43 |  |

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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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