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Leases - Additional Information (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) Property CorporateOfficeLease | Dec. 31, 2019
Corporate Office Leases [Member] |  |
Operating Leased Assets [Line Items] |  |
Number of operating leases | CorporateOfficeLease | 9 |
Ground Leases [Member] |  |
Operating Leased Assets [Line Items] |  |
Unsecured borrowing rates for actual pricing period used for calculating discount rate | 30 years |
Number of operating properties | Property | 14 |
COVID-19 [Member] |  |
Operating Leased Assets [Line Items] |  |
Write-off of straight-line rent receivables | $ 13.2 |
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 | 98.00% | 97.00%
Residential Apartment Leases [Member] | Maximum [Member] |  |
Operating Leased Assets [Line Items] |  |
Retail leases term | 12 months |
Non-residential Leases [Member] |  |
Operating Leased Assets [Line Items] |  |
Percentage of rental income | 2.00% | 3.00%
Decrease in rental revenues | $ 7.3 |
Non-residential Leases [Member] | Maximum [Member] |  |
Operating Leased Assets [Line Items] |  |
Retail leases term | 10 years |
Non-residential Leases [Member] | Minimum [Member] |  |
Operating Leased Assets [Line Items] |  |
Retail leases term | 5 years |

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- Definition Lessee operating lease expiration dates inclusive of extension options. + References No definition available. + Details
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- Definition Number of operating leases. + References No definition available. + Details
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- Definition Discount rate used by lessee to determine present value of operating lease payments. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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- Definition Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919359-209981 + Details
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