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Leases - Additional Information (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) Property CorporateOfficeLease | Dec. 31, 2018 | Jan. 01, 2019 USD ($)
Operating Leased Assets [Line Items] |  |  |
Percentage of rental income | 100.00% | 100.00% |
Lease liabilities | $ 331,334 |  | $ 278,287
Right-of-use assets | $ 512,774 |  | $ 434,201
Corporate Office Leases [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Number of operating leases | CorporateOfficeLease | 9 |  |
Number of office lease modified | CorporateOfficeLease | 4 |  |
Lease liabilities | $ 43,105 |  |
Right-of-use assets | $ 41,596 |  |
Ground Leases [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Unsecured borrowing rates for actual pricing period used for calculating discount rate | 30 years |  |
Lease liabilities | $ 264,990 |  |
Right-of-use assets | $ 413,196 |  |
Number of operating properties | Property | 14 |  |
Finance lease, liability | $ 23,239 |  |
Finance lease,ROU asset | 57,982 |  |
Modified Corporate Office leases [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Lease liabilities | 32,100 |  |
Right-of-use assets | 32,100 |  |
Ground Lease Under Development [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Finance lease, liability | 23,200 |  |
Finance lease,ROU asset | $ 57,900 |  |
Maximum [Member] | Corporate Office Leases [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Discount rate | 3.90% |  |
Remaining lease terms | 10 years |  |
Lease expiration dates (inclusive of applicable extension options) | 2042 |  |
Maximum [Member] | Ground Leases [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Discount rate | 5.50% |  |
Operating lease expiration year | 2118 |  |
Minimum [Member] | Corporate Office Leases [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Discount rate | 3.30% |  |
Lease expiration dates (inclusive of applicable extension options) | 2021 |  |
Minimum [Member] | Ground Leases [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Discount rate | 4.40% |  |
Operating lease expiration year | 2042 |  |
Residential Apartment Leases [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Percentage of rental income | 97.00% |  |
Residential Apartment Leases [Member] | Maximum [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Retail leases term | 12 months |  |
Retail Commercial Leases [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Percentage of rental income | 3.00% |  |
Retail Commercial Leases [Member] | Maximum [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Retail leases term | 10 years |  |
Retail Commercial Leases [Member] | Minimum [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Retail leases term | 5 years |  |

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