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Non-Controlling Interests, Preferred Shares, Common Shares and Common Shares in Treasury - Preferred Shares Outstanding (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Apr. 30, 2013
Dec. 31, 2012
Preferred Shares Outstanding [Line Items]      
Cumulative redeemable preferred shares $ 405,000   $ 405,000
Class H cumulative redeemable preferred shares [Member]
      
Preferred Shares Outstanding [Line Items]      
Cumulative redeemable preferred shares 55,000   205,000
Class J cumulative redeemable preferred shares [Member]
      
Preferred Shares Outstanding [Line Items]      
Cumulative redeemable preferred shares 200,000   200,000
Class K cumulative redeemable preferred shares [Member]
      
Preferred Shares Outstanding [Line Items]      
Cumulative redeemable preferred shares $ 150,000 $ 150,000 $ 0