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Investments in Unconsolidated Real Estate Funds - Additional Information (Details) |  | 12 Months Ended
--- | --- | ---
Jan. 25, 2019 USD ($) ft² | Dec. 31, 2019 USD ($) ft² | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Investment Holdings [Line Items] |  |  |  |
Area of office and retail properties | ft² |  | 13,100,000 |  |
Proceeds from sale of real estate |  | $ 150,307,000 | $ 349,013,000 | $ 540,333,000
Fund VII and VII-H [Member] | Office Building [Member] |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Area of office and retail properties | ft² | 65,000 |  |  |
Fund VII and VII-H [Member] | Zero Bond Street [Member] |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Proceeds from sale of real estate | $ 130,500,000 |  |  |
Fund VIII [Member] |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Capital commitments |  | 775,200,000 |  |
Capital commitments invested |  | $ 646,738,000 |  |
Alternative Investment Fund, Interest Rate |  | 1.30% |  |
Fund X [Member] |  |  |  |
Investment Holdings [Line Items] |  |  |  |
Capital commitments |  | $ 192,000,000 |  |
Capital commitments invested |  | $ 78,600,000 |  |
Alternative Investment Fund, Interest Rate |  | 7.80% |  |

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- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL6742756-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 54B -URI http://asc.fasb.org/extlink&oid=117332851&loc=SL7495116-110257 + Details
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- Definition Amount of funds committed to investment company from investors. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 205 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=25866437&loc=d3e10491-115837 + Details
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- Definition Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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