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Notes Receivable, Net - Additional Information (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Proceeds from notes receivable | $ 15,250 | $ 26,000 |
Additional advance | 183,556 | $ 122,332 |
Core Portfolio |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Note receivable accrued interest |  |  | $ 200
Proceeds from notes receivable |  |  | 26,000
Mortgage loans on real estate interest until maturity | 400 |  |
Core Portfolio | Note Receivable Due April 1, 2020 |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Proceeds from notes receivable |  |  | 15,000
Additional advance |  |  | 2,800
Core Portfolio | Town Center |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Note receivable accrued interest |  |  | 300
Note receivable exchanged |  |  | 22,000
Fund II |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Note receivable accrued interest | 400 |  | 800
Fund IV |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Note receivable accrued interest | 10,000 |  |
Proceeds from notes receivable | 15,250 |  |
Fund III |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Note receivable accrued interest | $ 4,700 |  | 4,700
Additional advance |  |  | $ 200

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