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Investment in Unconsolidated Real Estate Ventures - Summary of Transaction (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 18, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 17, 2017
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Gross sales price |  | $ 359,300 |  |  |
Debt principal |  | (370,319) | $ (768,912) |  |
Cash to Austin Venture |  | 60,346 | 145,416 | $ 21,022 |
Company's share of gain |  | $ 142,233 | $ 80,526 | $ 20,000 |
Austin Joint Venture [Member] |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |
Gross sales price | $ 333,250 |  |  |  |
Debt principal | (150,968) |  |  |  | $ (151,000)
Debt prepayment penalties | (2,120) |  |  |  |
Closing costs and net prorations | (7,420) |  |  |  |
Cash to Austin Venture | $ 172,742 |  |  |  |
Ownership percentage | 50.00% |  |  |  |
Cash to the Company | $ 86,371 |  |  |  |
Austin Venture basis of sold properties | (92,559) |  |  |  |
Austin Venture gain on sale | 80,183 |  |  |  |
Company's share of gain | 40,092 |  |  |  |
Deferred gain on sale | 12,072 |  |  |  |
Gain on real estate venture transactions | $ 52,164 |  |  |  |

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