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Investments in and Advances to Unconsolidated Real Estate Ventures - Summary of Composition of Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Schedule of Equity Method Investments [Line Items] |  |
Total investments in and advances to unconsolidated real estate ventures | $ 543,026 | $ 322,878
Prudential Global Investment Management (PGIM) [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity Method Investment, Ownership Percentage | 50.00% |
Total investments in unconsolidated real estate ventures | $ 215,624 | 0
Canadian Pension Plan Investment Board (CPPIB) |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity Method Investment, Ownership Percentage | 55.00% |
Total investments in unconsolidated real estate ventures | $ 109,911 | 97,521
Landmark |  |
Schedule of Equity Method Investments [Line Items] |  |
Total investments in unconsolidated real estate ventures | 77,944 | 84,320
CBREI Venture |  |
Schedule of Equity Method Investments [Line Items] |  |
Total investments in unconsolidated real estate ventures | $ 68,405 | 73,776
Berkshire Group |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity Method Investment, Ownership Percentage | 50.00% |
Total investments in unconsolidated real estate ventures | $ 46,391 | 43,937
Brandywine |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity Method Investment, Ownership Percentage | 30.00% |
Total investments in unconsolidated real estate ventures | $ 13,830 | $ 13,777
CIM/PacLife [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity Method Investment, Ownership Percentage | 16.70% | 16.67%
Total investments in unconsolidated real estate ventures | $ 10,385 | $ 9,339
Other |  |
Schedule of Equity Method Investments [Line Items] |  |
Total investments in unconsolidated real estate ventures | $ 536 | $ 208
Minimum | Landmark |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity Method Investment, Ownership Percentage | 1.80% |
Minimum | CBREI Venture |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity Method Investment, Ownership Percentage | 5.00% |
Maximum | Landmark |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity Method Investment, Ownership Percentage | 49.00% |
Maximum | CBREI Venture |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity Method Investment, Ownership Percentage | 64.00% |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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