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Non-Controlling Interests, Common Shares and Common Shares in Treasury and Preferred Shares - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Schedule Of Equity [Line Items]    
Reduction in non-controlling interest related to sale of interest in consolidated joint venture $ 709  
Operating partnership units outstanding 140,633 184,588
Common shares, par value $ 0.10 $ 0.10
Shares repurchased at cost $ 36,341  
Class A Depositary Share [Member]    
Schedule Of Equity [Line Items]    
Redemption date restrictions for depositary shares Jun. 05, 2022  
Class K Depositary Share [Member]    
Schedule Of Equity [Line Items]    
Cumulative redeemable preferred shares, liquidation value $ 500  
Class J Depositary Share [Member]    
Schedule Of Equity [Line Items]    
Cumulative redeemable preferred shares, liquidation value 500  
Class A 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 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  
Common Share Repurchase Program [Member]    
Schedule Of Equity [Line Items]    
Shares repurchased 3,100,000  
Shares repurchased at cost $ 36,300  
Joint Venture Partner [Member]    
Schedule Of Equity [Line Items]    
Reduction in non-controlling interest related to sale of interest in consolidated joint venture 2,100  
Loss on sale of interest in consolidated joint venture $ 200