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Schedule of Information Related to Stock Repurchase Programs (Detail) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Nov. 30, 2017 | Feb. 29, 2016 | Dec. 31, 2014 | Jul. 31, 2014
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Additional dollars authorized for repurchase |  | $ 1,200,000,000 | $ 800,000,000 |  | $ 400,000,000 | $ 400,000,000 |  | $ 400,000,000
Aggregate purchase price paid for shares purchased as part of publicly announced program |  | 356,413,000 | 346,890,000 | $ 224,260,000 |  |  |  |
Stock Repurchase Programs Twenty Fourteen |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Maximum number of dollars that may yet be purchased under the program |  |  |  |  |  |  | $ 342,050,000 |
Stock Repurchase Programs Twenty Fifteen |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Total number of shares purchased | [1] |  |  | 1,819,503 |  |  |  |
Total number of shares purchased as part of publicly announced programs |  |  |  | 1,326,207 |  |  |  |
Average price paid per share for shares purchased as part of publicly announced program |  |  |  | $ 125.34 |  |  |  |
Aggregate purchase price paid |  |  |  | $ 224,260,000 |  |  |  |
Aggregate purchase price paid for shares purchased as part of publicly announced program |  |  |  | 166,222,000 |  |  |  |
Maximum number of dollars that may yet be purchased under the program |  |  |  | $ 175,828,000 |  |  |  |
Stock Repurchase Programs Twenty Sixteen |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Additional dollars authorized for repurchase |  |  | $ 400,000,000 |  |  |  |  |
Total number of shares purchased | [1] |  | 2,983,320 |  |  |  |  |
Total number of shares cancelled |  |  | 2,500 |  |  |  |  |
Average price paid per share for forfeited restricted shares |  |  | $ 0.01 |  |  |  |  |
Aggregate purchase price paid |  |  | $ 346,890,000 |  |  |  |  |
Maximum number of dollars that may yet be purchased under the program |  |  | $ 285,891,000 |  |  |  |  |
Stock Repurchase Programs Twenty Sixteen | Stock Repurchase Program |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Total number of shares purchased as part of publicly announced programs |  |  | 2,512,592 |  |  |  |  |
Average price paid per share for shares purchased as part of publicly announced program |  |  | $ 115.39 |  |  |  |  |
Aggregate purchase price paid for shares purchased as part of publicly announced program |  |  | $ 289,937,000 |  |  |  |  |
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 |  |  |  |  |  |
Average price paid per share for shares purchased as part of publicly announced program |  | $ 108.83 |  |  |  |  |  |
Aggregate purchase price paid |  | $ 356,413,000 |  |  |  |  |  |
Aggregate purchase price paid for shares purchased as part of publicly announced program |  | 322,231,000 |  |  |  |  |  |
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 |  | 6,799,642 |  |  |  |  |  |
Average price paid per share for shares purchased as part of publicly announced program |  | $ 114.48 |  |  |  |  |  |
Aggregate purchase price paid for shares purchased as part of publicly announced program |  | $ 778,390,000 |  |  |  |  |  |
Stock Repurchase Programs Twenty Fifteen to Twenty Seventeen |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Additional dollars authorized for repurchase |  | $ 800,000,000 |  |  |  |  |  |
Total number of shares purchased | [1] | 8,068,944 |  |  |  |  |  |
Total number of shares cancelled |  | 13,291 |  |  |  |  |  |
Average price paid per share for forfeited restricted shares |  | $ 0.01 |  |  |  |  |  |
Aggregate purchase price paid |  | $ 927,563,000 |  |  |  |  |  |
[1] | Includes 10,791 and 2,500 of restricted shares that were forfeited by former employees pursuant to the terms of our restricted stock purchase plan during 2017 and 2016, respectively.

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