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Non-Controlling Interests, Preferred Shares, Common Shares and Common Shares in Treasury - Common Shares Through Open Market Sales (Detail) (USD $) In Thousands, except Share data in Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Equity [Abstract] |  |  |
Number of Shares Sold | 44.1 | 36.5 | 9.5
Average Price Per Share | $ 18.76 | $ 13.98 | $ 13.71
Net Proceeds | $ 788,045 | $ 492,129 | $ 129,684

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