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Subsequent Events - Additional Information (Detail) (Subsequent Event [Member], USD $)
In Millions, except Per Share data, unless otherwise specified
1 Months Ended 3 Months Ended
Apr. 30, 2014
Jun. 30, 2014
Class H Preferred Shares [Member]
   
Subsequent Event [Line Items]    
Redemption of preferred stock $ 55.0  
Preferred stock dividend rate 7.375%  
Cumulative redeemable preferred shares total redemption price per share $ 505  
Cumulative redeemable preferred shares share redemption price $ 500  
Redeemable preferred stock dividend per share prorated to redemption date $ 4.6094  
Write-off of preferred share original issuance costs   $ 1.9
Class H Depositary Share [Member]
   
Subsequent Event [Line Items]    
Cumulative redeemable preferred shares total redemption price per share $ 25.2305  
Cumulative redeemable preferred shares share redemption price $ 25.00  
Redeemable preferred stock dividend per share prorated to redemption date $ 0.2305