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Co-investments - Summary of Investments (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |
Co-investments | $ 1,267,593 | $ 1,119,258
Total operating and other co-investments, net [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Co-investments | $ 840,060 | 780,332
Membership Interest In CPPIB [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Limited partnership interest in partnership investments | 54.00% |
Co-investments | $ 487,002 | 500,287
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 | $ 187,905 | 214,408
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 | $ 118,924 | 13,827
Membership In Other [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Limited partnership interest in partnership investments | 51.00% |
Co-investments | $ 46,229 | 51,810
Total development co-investments, net [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Limited partnership interest in partnership investments | 50.00% |
Co-investments | $ 77,144 | 73,770
Total preferred interest co-investments [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Co-investments | 350,389 | 265,156
Total preferred interest co-investments [Member] | Investments in Majority-owned Subsidiaries [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Co-investments | $ 36,800 | 15,700
BEX II [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Co-investments |  | $ (36,700)

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