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Share-based Compensation - Additional Information (Details)
1 Months Ended 12 Months Ended
Jan. 31, 2015
USD ($)
Aug. 31, 2014
shares
Aug. 31, 2011
USD ($)
Dec. 31, 2016
USD ($)
unit / shares
fungible_unit
$ / shares
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
shares
Sep. 30, 2014
shares
Jun. 30, 2014
shares
Dec. 31, 2013
shares
Dec. 11, 2013
Dec. 31, 2012
shares
Dec. 17, 2012
Dec. 31, 2011
shares
Dec. 31, 2010
shares
Dec. 31, 2009
USD ($)
Jan. 01, 2008
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options       $ 6,000,000 $ 6,500,000 $ 6,800,000                    
Stock options, stock appreciation rights and other awards                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Expected life of option (in years)       5 years                        
All other awards                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Fungible units per share (in fungible units per share) | unit / shares       1.0                        
Expected life of option (in years)       10 years                        
Stock options                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Expected life of option (in years)       3 years 8 months 12 days 3 years 7 months 6 days 3 years 7 months 6 days                    
Period of commencement of option vesting, from date of grant (in years)       1 year                        
Exercise price of options granted, low end of the range (in dollars per share) | $ / shares       $ 20.67                        
Exercise price of options granted, high end of the range (in dollars per share) | $ / shares       $ 137.18                        
Remaining weighted average contractual life of the options outstanding (in years)       3 years 8 months 12 days                        
Remaining weighted average contractual life of the options exercisable (in years)       2 years 10 months 24 days                        
Total unrecognized compensation cost related to unvested stock awards       $ 13,300,000                        
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)       2 years 1 month 6 days                        
Weighted average fair value of options granted during the period       $ 8,363,036 $ 9,522,613 $ 2,841,678                    
Stock options | Minimum                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Award expiration period (in years)       5 years                        
Options vesting period (in years)       1 year                        
Stock options | Maximum                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Award expiration period (in years)       10 years                        
Options vesting period (in years)       5 years                        
Class O LTIP Units                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Preferred unit distributions as a percentage of common unit distributions       10.00%                        
Restricted Stock Awards                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Compensation expense       $ 7,153,966 7,540,747 9,658,019                    
Total unrecognized compensation cost related to unvested stock awards       $ 21,000,000                        
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)       2 years 8 months 12 days                        
Annual award vesting rate, low end of range (as a percent)       15.00%                        
Annual award vesting rate, high end of range (as a percent)       35.00%                        
Fair value of restricted stock vested during the period       $ 7,600,000 7,400,000 5,500,000                    
Weighted average fair value of options granted during the period       $ 10,650,077 $ 16,061,201 $ 1,141,675                    
Awards granted (in shares) | shares       98,800 143,053 9,550                    
Awards outstanding (in shares) | shares       3,202,031 3,137,881 3,000,979     2,994,197              
LTIP units                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)       1 year 10 months 24 days                        
Weighted average fair value of options granted during the period       $ 34,900,000 $ 25,400,000                      
Performance Shares                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Total unrecognized compensation cost related to unvested stock awards       5,700,000                        
Share-based Compensation       $ 26,500,000 30,200,000 $ 31,400,000                    
Employee Stock Purchase Plan                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Shares of common stock available for issuance (shares) | shares                               500,000
Duration of each offering period starting the first day of each calendar quarter (in months)       3 months                        
Purchase price as a percentage of market value of the common stock (percent)       85.00%                        
Shares of common stock issued (shares) | shares       95,448                        
Fourth Amended and Restated 2003 Stock Option and Incentive Plan [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Maximum fungible units that may be granted (in shares) | fungible_unit       27,030,000                        
Fungible units per share (in fungible units per share) | unit / shares       3.74                        
Shares that may be issued if equal to fungible units (shares) (less than) | shares       27,030,000                        
Fungible units | fungible_unit       9,500,000                        
Stock options, stock appreciation rights and other awards                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Fungible units per share (in fungible units per share) | unit / shares       0.73                        
Third Amendment and Restated 2005 Stock Option and Incentive Plan [Member] | Stock options                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Compensation expense       $ 8,900,000 8,000,000 8,100,000                    
2010 Notional Unit Long-Term Compensation Plan                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Compensation expense           2,700,000                    
Capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options $ 31,700,000                              
Approximate amount of awards that may be earned by recipients after beginning of the second year if maximum performance achieved                             $ 25,000,000  
Approximate amount of awards that may be earned by recipients after beginning of the third year if maximum performance achieved                             $ 25,000,000  
Minimum stock price appreciation to earn maximum amount of awards (as a percent)                             50.00%  
LTIP units earned (in shares) | shares                     327,416   327,416 385,583    
Percentage of LTIP Units earned, vested (percent)                   25.00%   50.00%        
2010 Notional Unit Long-Term Compensation Plan | Minimum                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Approximate amount of LTIP units that may be earned by the recipients based on stock price appreciation                             $ 15,000,000  
2010 Notional Unit Long-Term Compensation Plan | Maximum                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Approximate amount of LTIP units that may be earned by the recipients based on stock price appreciation                             $ 75,000,000  
2011 Outperformance Plan                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Compensation expense       0 4,500,000 8,600,000                    
Capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options         26,700,000                      
Approximate amount of LTIP units that may be earned by the recipients based on stock price appreciation     $ 85,000,000                          
LTIP units earned (in shares) | shares             280,454 560,908                
Value of LTIP Units that could be earned expressed as percentage of outperformance amount in excess of the 30% benchmark (percent)     10.00%                          
Duration period return to stockholders exceeds 25% (in years)     3 years                          
Cumulative return to stockholders (percent)     25.00%                          
Return to stockholders     $ 85,000,000.0                          
Performance period (in years)     3 years                          
2011 Outperformance Plan | Vested on August 31, 2014                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Percentage of units vested     50.00%                          
2011 Outperformance Plan | Vesting on August 31, 2015                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Percentage of units vested     50.00%                          
2011 Outperformance Plan | Earned anytime after beginning of second year                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Percentage of units vested     33.33%                          
2011 Outperformance Plan | Earned any time after beginning of third year                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Percentage of units vested     66.67%                          
2014 Outperformance Plan                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Compensation expense       8,400,000 $ 5,900,000 $ 200,000                    
Capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options       27,900,000                        
LTIP units earned (in shares) | shares   610,000                            
Performance period (in years)   3 years                            
Award period (in years)   3 years                            
Percentage of LTIP units that may be earned based on the Company's absolute total return to stockholders   66.67%                            
Percentage of LTIP units that may be earned based on relative total return to stockholders compared to constituents of the MSCI REIT index   33.33%                            
2014 Outperformance Plan | Vesting on August 31, 2017                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Percentage of units vested   50.00%                            
2014 Outperformance Plan | Vesting on August 31, 2018                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Percentage of units vested   50.00%                            
Deferred Stock Compensation Plan for Directors                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Compensation expense       $ 2,100,000                        
Maximum percentage of the annual retainer fee, chairman fees and meeting fees that may be deferred by non-employee directors (percent)       100.00%                        
Awards granted (in shares) | shares       9,022                        
Shares issued (in shares) | shares       9,279                        
Awards outstanding (in shares) | shares       89,790