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Leases - Additional Information (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2019 USD ($) Property CorporateOfficeLease
Corporate Office Leases [Member] |
Operating Leased Assets [Line Items] |
Number of operating leases | CorporateOfficeLease | 9
Lease termination date | Jan. 31, 2022
Amount incurred for leased office space | $ | $ 0.6
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
Minimum [Member] | Corporate Office Leases [Member] |
Operating Leased Assets [Line Items] |
Discount rate | 3.30%
Remaining lease terms | 1 year
Minimum [Member] | Ground Leases [Member] |
Operating Leased Assets [Line Items] |
Discount rate | 4.40%
Operating lease expiration year | 2042
Maximum [Member] | Corporate Office Leases [Member] |
Operating Leased Assets [Line Items] |
Discount rate | 3.90%
Remaining lease terms | 10 years
Maximum [Member] | Ground Leases [Member] |
Operating Leased Assets [Line Items] |
Discount rate | 5.50%
Operating lease expiration year | 2113
Residential Apartment Leases [Member] |
Operating Leased Assets [Line Items] |
Percentage of rental income | 97.00%
Retail Commercial Leases [Member] |
Operating Leased Assets [Line Items] |
Percentage of rental income | 3.00%
Retail Commercial Leases [Member] | Minimum [Member] |
Operating Leased Assets [Line Items] |
Retail/commercial leases term | 5 years
Retail Commercial Leases [Member] | Maximum [Member] |
Operating Leased Assets [Line Items] |
Retail/commercial leases term | 10 years

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- Definition Number of operating leases. + References No definition available. + Details
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- Definition Operating lease expiration year. + References No definition available. + Details
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- Definition Percentage of rental income. + References No definition available. + Details
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- Definition Unsecured borrowing rates for actual pricing period used for calculating discount rate. + References No definition available. + Details
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- Definition Date which lease or group of leases is set to expire, in CCYY-MM-DD format. + 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=77888426&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=77888426&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=77888428&loc=SL77919359-209981 + Details
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- Definition Number of separate real estate development properties located on land subject to ground leases. + References No definition available. + Details
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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