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Equity - Additional Information (Detail) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Forward Sale [Member]
Oct. 31, 2013
Subsequent Events [Member]
Forward Contracts [Member]
Oct. 31, 2013
Subsequent Events [Member]
Forward Sale [Member]
Apr. 30, 2013
Class K Preferred Stock [Member]
May 31, 2013
Class H Preferred Shares [Member]
Sep. 30, 2013
Class H Preferred Shares [Member]
Dec. 31, 2012
Class H Preferred Shares [Member]
Dec. 31, 2012
VSEP Grants [Member]
Dec. 31, 2012
Additional Vesting [Member]
Dec. 31, 2012
Performance Period [Member]
Sep. 30, 2013
Absolute Performance Awards [Member]
Sep. 30, 2013
Relative Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Sale of common shares         39.1   39.1                  
Shares settled under forward equity agreement     3.96     35.14                    
Settlement rate of shares settled under forward equity agreement     $ 17.94     $ 17.94                    
Proceeds from issuance of common stock, forward equity agreements     $ 158,048,000 $ 418,522,000   $ 701,300,000                    
Common shares issued     5.0                          
Common equity program, generating gross proceeds per share     $ 17.70                          
Gross proceeds     88,400,000                          
Cumulative redeemable preferred shares 205,000,000    205,000,000          150,000,000   55,000,000 205,000,000          
Preferred stock dividend rate     7.375% 7.50%       6.25%                
preferred stock stated value               $ 500.00   $ 500.00 $ 500.00          
Cumulative redeemable preferred shares share redemption price per share               $ 25.00 $ 25.00              
Preferred Stock redemption value                 150,000,000              
Cumulative redeemable preferred shares total redemption price per share                 $ 25.1127              
Redeemable preferred stock dividend per share prorated to redemption date                 $ 0.1127              
Write-off of preferred share original issuance costs 0 5,804,000 5,246,000 5,804,000         5,200,000              
Period for which the options granted are generally vested                       7 years 4 years 3 years    
Compound annual growth rate                             8.00%  
Performance awards                             18,000,000 36,000,000
Aggregate percentage of performance awards                             1.4133% 1.9337%
Expected vesting percentage     20.00%                          
Unrecognized compensation costs     $ 7,700,000                          
Term of recognition of unrecognized stock option compensation costs     6 years 3 months