XML 96 R98.htm IDEA: XBRL DOCUMENT v2.4.0.8
Non-Controlling Interests, Preferred Shares, Common Shares and Common Shares in Treasury - Preferred Shares Outstanding (Parenthetical) (Detail) (USD $)
 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
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 J cumulative redeemable preferred shares [Member]
Dec. 31, 2012
Class J cumulative redeemable preferred shares [Member]
Apr. 30, 2013
Class K cumulative redeemable preferred shares [Member]
Dec. 31, 2013
Class K cumulative redeemable preferred shares [Member]
Preferred Shares Outstanding [Line Items]              
Preferred stock dividend rate 7.375% 7.375% 7.375% 6.50% 6.50% 6.25% 6.25%
Cumulative redeemable preferred shares liquidation value   $ 500 $ 500 $ 500 $ 500 $ 500.00 $ 500
Cumulative redeemable preferred shares authorized   750,000 750,000 750,000 750,000   750,000
Cumulative redeemable preferred shares issued   110,000 410,000 400,000 400,000   300,000
Cumulative redeemable preferred shares outstanding   110,000 410,000 400,000 400,000   300,000