v2.4.0.8

Shareholders' Equity - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2012 | Jun. 30, 2012 | May 31, 2012 | Mar. 31, 2012 | Jun. 30, 2011 | Sep. 30, 2010 | Jun. 30, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Jul. 30, 2012 | May 03, 2010 | Apr. 30, 2009
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares, shares outstanding |  |  |  |  |  |  |  | 106.9 | 115.8 | 117.8 |  |  |
Preference shares authorized |  |  |  |  |  |  |  | 7.5 |  |  |  |  |
Preference shares par value |  |  |  |  |  |  |  | $ 0.002 |  |  |  |  |
Cash dividend per common share |  |  |  | $ 0.30 | $ 0.20 | $ 0.13 | $ 0.10 |  |  |  |  |  |
Increase in cash dividends per common share |  |  |  | $ 0.10 | $ 0.07 | $ 0.03 |  |  |  |  |  |  |
Dividends paid |  |  |  |  |  |  |  | $ 135,091,000 | $ 85,489,000 | $ 53,740,000 |  |  |
Share repurchase program capacity authorization |  |  |  |  |  |  |  |  |  |  | 1,000,000,000 | 1,000,000,000 | 300,000,000
Previous expiration date of share repurchase program |  |  |  |  |  |  |  | Apr. 01, 2011 |  |  |  |  |
Revised expiration date of share repurchase program |  |  |  |  |  |  |  | Dec. 01, 2014 |  |  |  |  |
Repurchase of common stock |  |  | 427,900,000 |  |  |  |  | 556,727,000 | 321,639,000 | 160,008,000 |  |  |
Agreement expiration date |  |  |  |  |  |  |  | Jul. 27, 2012 |  |  |  |  |
Repurchase of common stock | 3.9 | 5.3 |  |  |  |  |  | 11.0 | 5.5 | 5.7 |  |  |
Share repurchase program, remaining authorized capacity |  |  |  |  |  |  |  | 950,000,000 |  |  |  |  |
Shares repurchased through open market purchases, aggregate cost |  |  |  |  |  |  |  | $ 527,800,000 | $ 298,800,000 | $ 150,100,000 |  |  |
Average cost per share of shares repurchased |  |  |  |  |  |  |  | $ 47.78 | $ 54.27 | $ 26.13 |  |  |

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