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Investment in Unconsolidated Real Estate Ventures - Summary of Financial Position of Real Estate Ventures (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
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Schedule of Equity Method Investments [Line Items] |  |  |
Net property | $ 841,743 |  | $ 835,983
Other assets | 351,364 |  | 159,499
Other liabilities | 289,952 |  | 85,681
Debt, net | 581,024 |  | 365,707
Equity | 322,131 |  | 544,094
Right of use asset - operating leases, net | 21,828 | $ 22,400 | 0
Lease liability - operating leases | $ 22,503 | 22,400 | $ 0
MAP Venture |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Right of use asset - operating leases, net |  | 197,100 |
Lease liability - operating leases |  | $ 206,400 |

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