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Schedule of Information Related to Stock Repurchase Programs (Detail) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jul. 31, 2019 | Dec. 31, 2016 | Dec. 31, 2014
Class of Stock [Line Items] |  |  |  |  |  |  |
Additional dollars authorized for repurchase |  | $ 2,700,000,000 |  |  | $ 1,000,000,000.0 |  | $ 1,700,000,000
Aggregate purchase price paid for shares purchased as part of publicly announced program |  | $ 753,927,000 | $ 414,002,000 | $ 356,413,000 |  |  |
Stock Repurchase Program |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Total number of shares purchased as part of publicly announced programs |  | 11,680,564 |  |  |  |  |
Average price paid per share for shares purchased as part of publicly announced program |  | $ 122.41 |  |  |  |  |
Aggregate purchase price paid for shares purchased as part of publicly announced program |  | $ 1,429,768,000 |  |  |  |  |
Stock Repurchase Programs Twenty Sixteen |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Maximum number of dollars that may yet be purchased under the program |  |  |  |  |  | $ 285,891,000 |
Stock Repurchase Programs Twenty Seventeen |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Additional dollars authorized for repurchase |  |  |  | $ 400,000,000 |  |  |
Total number of shares purchased | [1] |  |  | 3,266,121 |  |  |
Total number of shares cancelled |  |  |  | 10,791 |  |  |
Average price paid per share for forfeited restricted shares |  |  |  | $ 0.01 |  |  |
Total number of shares purchased as part of publicly announced programs |  |  |  | 2,960,843 |  |  |
Aggregate purchase price paid |  |  |  | $ 356,413,000 |  |  |
Aggregate purchase price paid for shares purchased as part of publicly announced program |  |  |  | 322,200,000 |  |  |
Maximum number of dollars that may yet be purchased under the program |  |  |  | $ 363,660,000 |  |  |
Stock Repurchase Programs Twenty Seventeen | Stock Repurchase Program |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Total number of shares purchased as part of publicly announced programs |  |  |  | 2,960,843 |  |  |
Average price paid per share for shares purchased as part of publicly announced program |  |  |  | $ 108.83 |  |  |
Aggregate purchase price paid for shares purchased as part of publicly announced program |  |  |  | $ 322,231,000 |  |  |
Stock Repurchase Programs Twenty Eighteen |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Additional dollars authorized for repurchase |  |  | $ 500,000,000 |  |  |  |
Total number of shares purchased | [1] |  | 3,435,992 |  |  |  |
Total number of shares cancelled |  |  | 11,224 |  |  |  |
Average price paid per share for forfeited restricted shares |  |  | $ 0.01 |  |  |  |
Total number of shares purchased as part of publicly announced programs |  |  | 3,321,968 |  |  |  |
Aggregate purchase price paid |  |  | $ 414,002,000 |  |  |  |
Aggregate purchase price paid for shares purchased as part of publicly announced program |  |  | 401,300,000 |  |  |  |
Maximum number of dollars that may yet be purchased under the program |  |  | $ 462,344,000 |  |  |  |
Stock Repurchase Programs Twenty Eighteen | Stock Repurchase Program |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Total number of shares purchased as part of publicly announced programs |  |  | 3,321,968 |  |  |  |
Average price paid per share for shares purchased as part of publicly announced program |  |  | $ 120.81 |  |  |  |
Aggregate purchase price paid for shares purchased as part of publicly announced program |  |  | $ 401,316,000 |  |  |  |
Stock Repurchase Programs Twenty Nineteen |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Additional dollars authorized for repurchase |  | $ 1,000,000,000 |  |  |  |  |
Total number of shares purchased | [1] | 5,762,409 |  |  |  |  |
Total number of shares cancelled |  | 27,713 |  |  |  |  |
Average price paid per share for forfeited restricted shares |  | $ 0.01 |  |  |  |  |
Total number of shares purchased as part of publicly announced programs |  | 5,397,753 |  |  |  |  |
Aggregate purchase price paid |  | $ 753,928,000 |  |  |  |  |
Aggregate purchase price paid for shares purchased as part of publicly announced program |  | 706,200,000 |  |  |  |  |
Maximum number of dollars that may yet be purchased under the program |  | $ 756,123,000 |  |  |  |  |
Stock Repurchase Programs Twenty Nineteen | Stock Repurchase Program |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Total number of shares purchased as part of publicly announced programs |  | 5,397,753 |  |  |  |  |
Average price paid per share for shares purchased as part of publicly announced program |  | $ 130.84 |  |  |  |  |
Aggregate purchase price paid for shares purchased as part of publicly announced program |  | $ 706,221,000 |  |  |  |  |
Stock Repurchase Programs Twenty Seventeen to Twenty Nineteen |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Additional dollars authorized for repurchase |  | $ 1,900,000,000 |  |  |  |  |
Total number of shares purchased | [1] | 12,464,522 |  |  |  |  |
Total number of shares cancelled |  | 49,728 |  |  |  |  |
Average price paid per share for forfeited restricted shares |  | $ 0.01 |  |  |  |  |
Aggregate purchase price paid |  | $ 1,524,343,000 |  |  |  |  |
[1] | Includes 27,713, 11,224 and 10,791 of restricted shares that were forfeited by former employees pursuant to the terms of our restricted stock purchase plan during 2019, 2018 and 2017, respectively.

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