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Co-investments - Summary of Investments (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015
Schedule of Equity Method Investments [Line Items] |  |
Co-investments | $ 1,103,272 | $ 1,036,047
Total operating co investments [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Co-investments | 754,266 | 786,066
Membership Interest In Limited Liability Company That Owns Connolly Station [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Co-investments | $ 379,311 | 376,862
Limited partnership interest in partnership investments | 55.00% |
Membership interest in Wesco I, III, and IV [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Co-investments | $ 209,573 | 218,902
Limited partnership interest in partnership investments | 50.00% |
Membership interest in BEXAEW [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Co-investments | $ 65,636 | 88,850
Limited partnership interest in partnership investments | 50.00% |
Membership Interest In Palm Valley [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Co-investments | $ 68,229 | 68,525
Limited partnership interest in partnership investments | 50.00% |
Partnership interest in Other Funds [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Co-investments | $ 31,517 | 32,927
Partnership interest in Other Funds [Member] | Minimum [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Limited partnership interest in partnership investments | 50.00% |
Partnership interest in Other Funds [Member] | Maximum [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Limited partnership interest in partnership investments | 55.00% |
Total development co investments [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Co-investments | $ 175,269 | 143,669
Total development co investments [Member] | Minimum [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Limited partnership interest in partnership investments | 50.00% |
Total development co investments [Member] | Maximum [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Limited partnership interest in partnership investments | 55.00% |
Total preferred interest investments [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Co-investments | $ 173,737 | 106,312
Total preferred interest investments [Member] | Investments in Majority-owned Subsidiaries [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Co-investments | $ 35,800 | $ 35,800

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