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Leases - Additional Information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Property
CorporateOfficeLease
Sep. 30, 2019
USD ($)
Property
CorporateOfficeLease
Jan. 01, 2019
USD ($)
Operating Leased Assets [Line Items]      
Lease liabilities $ 333,312 $ 333,312 $ 278,287
Right-of-use assets $ 481,044 $ 481,044 $ 434,201
Corporate Office Leases [Member]      
Operating Leased Assets [Line Items]      
Number of operating leases | CorporateOfficeLease   9  
Number of office lease modified | CorporateOfficeLease 2    
Lease liabilities $ 45,237 $ 45,237  
Right-of-use assets $ 43,739 $ 43,739  
Lease expiration date   Nov. 30, 2032  
Number of option to extend | CorporateOfficeLease 2 2  
Lease renewal term 5 years 5 years  
Amount incurred for leased office space $ 700 $ 2,000  
Ground Leases [Member]      
Operating Leased Assets [Line Items]      
Unsecured borrowing rates for actual pricing period used for calculating discount rate   30 years  
Lease liabilities 264,865 $ 264,865  
Right-of-use assets $ 414,104 $ 414,104  
Number of operating properties | Property 14 14  
Finance lease, liability $ 23,210 $ 23,210  
Finance lease,ROU asset 23,201 23,201  
Modified Corporate Office leases [Member]      
Operating Leased Assets [Line Items]      
Lease liabilities 29,100 29,100  
Right-of-use assets 29,100 29,100  
Ground Lease Under Development [Member]      
Operating Leased Assets [Line Items]      
Finance lease, liability 23,200 23,200  
Finance lease,ROU asset $ 23,200 $ 23,200  
Minimum [Member] | Corporate Office Leases [Member]      
Operating Leased Assets [Line Items]      
Discount rate 3.30% 3.30%  
Remaining lease terms (inclusive of applicable extension options)   1 year  
Minimum [Member] | Ground Leases [Member]      
Operating Leased Assets [Line Items]      
Discount rate 4.40% 4.40%  
Operating lease expiration year   2042  
Maximum [Member] | Corporate Office Leases [Member]      
Operating Leased Assets [Line Items]      
Discount rate 3.90% 3.90%  
Remaining lease terms 10 years 10 years  
Remaining lease terms (inclusive of applicable extension options)   23 years  
Maximum [Member] | Ground Leases [Member]      
Operating Leased Assets [Line Items]      
Discount rate 5.50% 5.50%  
Operating lease expiration year   2113  
Residential Apartment Leases [Member]      
Operating Leased Assets [Line Items]      
Percentage of rental income   97.10%  
Retail Commercial Leases [Member]      
Operating Leased Assets [Line Items]      
Percentage of rental income   2.90%  
Retail Commercial Leases [Member] | Minimum [Member]      
Operating Leased Assets [Line Items]      
Retail/commercial leases term 5 years 5 years  
Retail Commercial Leases [Member] | Maximum [Member]      
Operating Leased Assets [Line Items]      
Retail/commercial leases term 10 years 10 years