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Share Repurchases - Additional information (Detail) - USD ($) $ / shares in Units, shares in Thousands | 1 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Nov. 02, 2016 | Sep. 30, 2016 | Oct. 31, 2016 | Jul. 13, 2016 | Apr. 30, 2015
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Purchase of treasury stock (in shares) |  | 9,930 |  |  |
Purchase of treasury stock |  | $ 656,087,000 |  |  |
Purchase of treasury stock, average price per share |  | $ 66.07 |  |  |
Share repurchase program, authorized amount |  |  |  | $ 1,240,748,000 | $ 259,252,000
Subsequent Event |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Purchase of treasury stock (in shares) | 3,367 |  |  |  |
Purchase of treasury stock | $ 212,353,000 |  |  |  |
Purchase of treasury stock, average price per share | $ 63.07 |  |  |  |
Share repurchase program, outstanding authorizations available for share repurchase |  |  | $ 881,040,000 |  |

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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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