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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 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended
Mar. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mar. 18, 2011
Dec. 31, 2011
Minimum [Member]
Dec. 31, 2011
Maximum [Member]
Mar. 18, 2011
Stock Purchase Agreement Otto Transaction [Member]
Dec. 31, 2009
Stock Purchase Agreement Otto Transaction [Member]
Apr. 30, 2013
Class K cumulative redeemable preferred shares [Member]
Dec. 31, 2013
Class K cumulative redeemable preferred shares [Member]
Dec. 31, 2012
Class K cumulative redeemable preferred shares [Member]
Dec. 31, 2013
Class H depositary share [Member]
Dec. 31, 2013
Class J depositary share [Member]
Dec. 31, 2013
Class K depositary share [Member]
Dec. 31, 2013
Class A Cumulative Redeemable Preferred Shares [Member]
Dec. 31, 2013
Class B Cumulative Redeemable Preferred Shares [Member]
Dec. 31, 2013
Class C Cumulative Redeemable Preferred Shares [Member]
Dec. 31, 2013
Class D Cumulative Redeemable Preferred Shares [Member]
Dec. 31, 2013
Class E Cumulative Redeemable Preferred Shares [Member]
Dec. 31, 2013
Class F Cumulative Redeemable Preferred Shares [Member]
Dec. 31, 2013
Class G Cumulative Redeemable Preferred Shares [Member]
May 31, 2013
Class H cumulative redeemable preferred shares [Member]
Dec. 31, 2013
Class H cumulative redeemable preferred shares [Member]
Dec. 31, 2012
Class H cumulative redeemable preferred shares [Member]
Dec. 31, 2013
Class I Cumulative Redeemable Preferred Shares [Member]
Dec. 31, 2013
Class J cumulative redeemable preferred shares [Member]
Dec. 31, 2012
Class J cumulative redeemable preferred shares [Member]
Dec. 31, 2013
Non-Cumulative Preferred Shares [Member]
Dec. 31, 2013
Cumulative Voting Preferred Shares [Member]
Schedule Of Equity [Line Items]                                                            
Operating partnership units outstanding   369,176 369,176                                                      
Cumulative redeemable preferred shares   $ 405,000,000 $ 405,000,000             $ 150,000,000 $ 150,000,000 $ 0                       $ 55,000,000 $ 205,000,000   $ 200,000,000 $ 200,000,000    
Preferred stock dividend rate                   6.25% 6.25%                       7.375% 7.375% 7.375%   6.50% 6.50%    
Cumulative redeemable preferred shares, price per share                   $ 500.00 $ 500                         $ 500 $ 500   $ 500 $ 500    
Cumulative redeemable preferred shares share redemption price                   $ 25.00                         $ 25.00              
Redemption of preferred stock   150,000,000 170,000,000 180,000,000                                     150,000,000              
Cumulative redeemable preferred shares total redemption price per share                                             $ 25.1127              
Redeemable preferred stock dividend per share prorated to redemption date                                             $ 0.1127              
Write-off of preferred share original issuance costs   5,246,000 5,804,000 6,402,000                                     5,246,000              
Preferred share, stated value                         $ 500 $ 500 $ 500                              
Percent of depositary share represented in preferred share                         0.05% 0.05% 0.05%                              
Redemption date restrictions for depositary shares                           Aug. 01, 2017 Apr. 09, 2018                              
Preferred Shares, without par value                     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   $ 0.54 $ 0.48 $ 0.22                                                    
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                                                  
Gain on equity derivative instruments   $ 0 $ 0 $ 21,926,000                                                    
Dividend yield assumptions           3.00% 3.20%                                              
Volatility assumptions 36.60%