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Segment Information - Summary of Certain Balance Sheet Data by Segment (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Real estate, at cost | $ 5,775,519 | $ 5,792,734
Investments in and advances to unconsolidated real estate ventures | 543,026 | 322,878
Total assets (1) | 5,986,251 | 5,997,285
Operating Segments | Commercial Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Real estate, at cost | 3,415,294 | 3,634,472
Investments in and advances to unconsolidated real estate ventures | 396,199 | 177,173
Total assets (1) | 3,361,122 | 3,707,255
Operating Segments | Multifamily |  |
Segment Reporting Information [Line Items] |  |
Real estate, at cost | 1,998,297 | 1,656,974
Investments in and advances to unconsolidated real estate ventures | 107,882 | 109,232
Total assets (1) | 1,682,872 | 1,528,177
Operating Segments | Other |  |
Segment Reporting Information [Line Items] |  |
Real estate, at cost | 361,928 | 501,288
Investments in and advances to unconsolidated real estate ventures | 38,945 | 36,473
Total assets (1) | $ 942,257 | $ 761,853

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The carrying amount of investments in unconsolidated real estate and other joint ventures not separately presented. This includes direct and indirect investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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