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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 |

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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