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Non-Controlling Interests, Preferred Shares, Common Shares and Common Shares in Treasury - Common Shares Through Open Market Sales (Detail) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Equity [Abstract] |  |  |
Number of Shares Sold |  | 0.7 | 44.1
Average Price Per Share |  | $ 18.15 | $ 18.76
Net Proceeds | $ 0 | $ 11,635 | $ 788,045

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