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Non-Controlling Interests, Preferred Shares, Common Shares and Common Shares in Treasury - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |
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Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Mar. 18, 2011 | Dec. 31, 2011 Minimum [Member] | Dec. 31, 2010 Minimum [Member] | Dec. 31, 2011 Maximum [Member] | Dec. 31, 2010 Maximum [Member] | Mar. 31, 2011 Stock Purchase Agreement Otto Transaction [Member] | Dec. 31, 2009 Stock Purchase Agreement Otto Transaction [Member] | Aug. 30, 2012 Class J Preferred Shares [Member] | Dec. 31, 2012 Class J Preferred Shares [Member] | Dec. 31, 2011 Class J Preferred Shares [Member] | Dec. 31, 2012 Class H Preferred Shares [Member] | Dec. 31, 2011 Class H Preferred Shares [Member] | Dec. 31, 2012 Class A Preferred Shares [Member] | Dec. 31, 2012 Class B Preferred Shares [Member] | Dec. 31, 2012 Class C Preferred Shares [Member] | Dec. 31, 2012 Class D Preferred Shares [Member] | Dec. 31, 2012 Class E Preferred Shares [Member] | Dec. 31, 2012 Class F Preferred Shares [Member] | Dec. 31, 2012 Class G Preferred Shares [Member] | Aug. 30, 2012 Class I Preferred Shares [Member] | Dec. 31, 2011 Class I Preferred Shares [Member] | Dec. 31, 2012 Class I Preferred Shares [Member] | Dec. 31, 2012 Class K Preferred Shares [Member] | Dec. 31, 2012 Non-Cumulative Preferred Shares [Member] | Dec. 31, 2012 Cumulative Voting Preferred Shares [Member]
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating partnership units outstanding |  | 369,176 | 369,176 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable OP Units outstanding |  | 29,525 | 29,525 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative redeemable preferred shares |  | $ 405,000,000 | $ 375,000,000 |  |  |  |  |  |  |  |  | $ 200,000,000 | $ 200,000,000 | $ 0 | $ 205,000,000 | $ 205,000,000 |  |  |  |  |  |  |  |  | $ 170,000,000 | $ 0 |  |  |
Preferred stock dividend rate |  |  |  |  |  |  |  |  |  |  |  | 6.50% | 6.50% |  | 7.375% | 7.375% |  |  |  |  |  |  |  | 7.50% | 7.50% |  |  |  |
Cumulative redeemable preferred shares, price per share |  |  |  |  |  |  |  |  |  |  |  | $ 500 | $ 500 |  | $ 500 | $ 500 |  |  |  |  |  |  |  |  | $ 500 |  |  |  |
Cumulative redeemable preferred shares share redemption price |  |  |  |  |  |  |  |  |  |  |  | $ 25.00 |  |  |  |  |  |  |  |  |  |  |  | $ 25.00 |  |  |  |  |
Cumulative redeemable preferred shares total redemption price per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.1875 |  |  |  |  |
Redeemable preferred stock dividend per share prorated to redemption date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.1875 |  |  |  |  |
Write-off of Preferred Share original issuance costs |  | 5,804,000 | 6,402,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,800,000 |  |  |  |  |
Preferred share, stated value |  |  |  |  |  |  |  |  |  |  |  |  | $ 500 |  | $ 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative redeemable preferred shares, shares authorized |  |  |  |  |  |  |  |  |  |  |  |  | 750,000 | 750,000 | 750,000 | 750,000 | 750,000 | 750,000 | 750,000 | 750,000 | 750,000 | 750,000 | 750,000 |  | 750,000 | 750,000 | 750,000 | 750,000 | 2,000,000
Common shares, par value |  | $ 0.10 | $ 0.10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared per common share |  | $ 0.48 | $ 0.22 | $ 0.08 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common shares available for purchase |  |  |  |  |  |  |  |  |  |  | 32,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common shares available for purchase through warrants |  |  |  |  |  |  |  |  |  | 10,000,000 | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of gross proceeds expected from stock to be issued and sold per Stock Purchase Agreement |  |  |  |  |  |  |  |  |  |  | 112,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of warrants, exercise price per share |  |  |  |  |  |  |  |  |  | 6.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average purchase price of additional common shares sold |  |  |  |  |  |  |  |  |  | Less than $6.00 per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity derivative liability - affiliate |  |  |  |  | $ 74,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend yield assumptions |  |  |  |  |  | 3.00% | 2.40% | 3.20% | 4.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Volatility assumptions | 36.60% |  |  | 79.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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