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Non-Controlling Interests, Preferred Shares, Common Shares and Common Shares in Treasury - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule Of Equity [Line Items]      
Operating partnership units outstanding 369,176 1,412,366  
Write-off of preferred share original issuance costs $ 0 $ 1,943 $ 5,246
Common shares, par value $ 0.10 $ 0.10  
Class J depositary share [Member]      
Schedule Of Equity [Line Items]      
Cumulative redeemable preferred shares liquidation value $ 500    
Redemption date restrictions for depositary shares Aug. 01, 2017    
Class K depositary share [Member]      
Schedule Of Equity [Line Items]      
Cumulative redeemable preferred shares liquidation value $ 500    
Redemption date restrictions for depositary shares Apr. 09, 2018    
Class A cumulative redeemable preferred shares [Member]      
Schedule Of Equity [Line Items]      
Preferred Shares, without par value 750,000    
Class B cumulative redeemable preferred shares [Member]      
Schedule Of Equity [Line Items]      
Preferred Shares, without par value 750,000    
Class C cumulative redeemable preferred shares [Member]      
Schedule Of Equity [Line Items]      
Preferred Shares, without par value 750,000    
Class D cumulative redeemable preferred shares [Member]      
Schedule Of Equity [Line Items]      
Preferred Shares, without par value 750,000    
Class E cumulative redeemable preferred shares [Member]      
Schedule Of Equity [Line Items]      
Preferred Shares, without par value 750,000    
Class F cumulative redeemable preferred shares [Member]      
Schedule Of Equity [Line Items]      
Preferred Shares, without par value 750,000    
Class G cumulative redeemable preferred shares [Member]      
Schedule Of Equity [Line Items]      
Preferred Shares, without par value 750,000    
Class H cumulative redeemable preferred shares [Member]      
Schedule Of Equity [Line Items]      
Preferred Shares, without par value 750,000    
Class I cumulative redeemable preferred shares [Member]      
Schedule Of Equity [Line Items]      
Preferred Shares, without par value 750,000    
Class J cumulative redeemable preferred shares [Member]      
Schedule Of Equity [Line Items]      
Cumulative redeemable preferred shares liquidation value $ 500 $ 500  
Preferred Shares, without par value 750,000 750,000  
Class K cumulative redeemable preferred shares [Member]      
Schedule Of Equity [Line Items]      
Cumulative redeemable preferred shares liquidation value $ 500 $ 500  
Preferred Shares, without par value 750,000 750,000  
Non-Cumulative Preferred Shares [Member]      
Schedule Of Equity [Line Items]      
Preferred Shares, without par value 750,000    
Cumulative Voting Preferred Shares [Member]      
Schedule Of Equity [Line Items]      
Preferred Shares, without par value 2,000,000    
Preferred Shares [Member]      
Schedule Of Equity [Line Items]      
Fees paid for issuance of shares     400
Common Shares [Member]      
Schedule Of Equity [Line Items]      
Fees paid for issuance of shares   $ 200 $ 700
Chicago, IL [Member]      
Schedule Of Equity [Line Items]      
Operating Partnership Units Issued   1,000,000