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Co-investments - Summary of Investments (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |
Co-investments | $ 1,413,861 | $ 1,300,140
Total operating and other co-investments, net [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Co-investments | $ 863,844 | 833,270
Membership Interest In CPPIB [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Limited partnership interest in partnership investments | 54.00% |
Co-investments | $ 469,288 | 482,507
Membership interest in Wesco I, III, IV, and V [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Limited partnership interest in partnership investments | 52.00% |
Co-investments | $ 212,808 | 194,890
Membership interest in BEXAEW, BEX II And BEX III [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Limited partnership interest in partnership investments | 50.00% |
Co-investments | $ 161,467 | 121,780
Membership In Other [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Limited partnership interest in partnership investments | 48.00% |
Co-investments | $ 20,281 | 34,093
Total development co-investments, net [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Limited partnership interest in partnership investments | 50.00% |
Co-investments | $ 137,626 | 94,060
Total preferred interest co-investments [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Co-investments | 412,391 | 372,810
Total preferred interest co-investments [Member] | Investments in Majority-owned Subsidiaries [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Co-investments | $ 70,900 | $ 51,800

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