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Schedule of Information Related to Stock Repurchase Programs (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Jul. 31, 2014 | Dec. 31, 2012
Class of Stock [Line Items] |  |  |  |  |
Additional dollars authorized for repurchase | $ 400,000,000 |  |  | $ 400,000,000 |
Total number of shares purchased | 3,275,837 |  |  |  |
Total number of shares cancelled | 767,704 |  |  |  |
Aggregate purchase price paid | $ 352,210,000 |  |  |  |
Aggregate purchase price paid for shares purchased as part of publicly announced program | $ 224,260,000 | $ 100,749,000 | $ 27,201,000 |  |
Stock Repurchase Program |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Total number of shares purchased as part of publicly announced programs | 1,874,399 |  |  |  |
Average price pad per share for shares purchased as part of publicly announced program | $ 119.60 |  |  |  |
Aggregate purchase price paid for shares purchased as part of publicly announced program | $ 224,172,000 |  |  |  |
Stock Repurchase Programs Twenty Twelve |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Maximum number of shares that may yet be purchased under the program |  |  |  |  | 767,704
Stock Repurchase Programs Twenty Thirteen |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Total number of shares purchased |  |  | 427,170 |  |
Total number of shares purchased as part of publicly announced programs |  |  | 0 |  |
Aggregate purchase price paid |  |  | $ 27,201,000 |  |
Maximum number of shares that may yet be purchased under the program |  |  | 767,704 |  |
Stock Repurchase Programs Twenty Fourteen |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Additional dollars authorized for repurchase |  | $ 400,000,000 |  |  |
Total number of shares purchased |  | 1,029,164 |  |  |
Total number of shares cancelled |  | 767,704 |  |  |
Total number of shares purchased as part of publicly announced programs |  | 548,192 |  |  |
Average price pad per share for shares purchased as part of publicly announced program |  | $ 105.71 |  |  |
Aggregate purchase price paid |  | $ 100,749,000 |  |  |
Aggregate purchase price paid for shares purchased as part of publicly announced program |  | 57,950,000 |  |  |
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 | 1,819,503 |  |  |  |
Aggregate purchase price paid | $ 224,260,000 |  |  |  |
Maximum number of dollars that may yet be purchased under the program | $ 175,828,000 |  |  |  |
Stock Repurchase Programs Twenty Fifteen | Stock Repurchase Program |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Total number of shares purchased as part of publicly announced programs | 1,326,207 |  |  |  |
Average price pad per share for shares purchased as part of publicly announced program | $ 125.34 |  |  |  |
Aggregate purchase price paid for shares purchased as part of publicly announced program | $ 166,222,000 |  |  |  |

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