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Notes Receivable, Net - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Note receivable exchanged | $ 22,021 | $ 101,705 |  |
Proceeds from notes receivable | 26,000 | 32,000 | $ 42,819 |
Additional advance | 187,173 | 156,344 | 222,071 |
Recovered mortgage amount including accrued interest and fees |  | 16,800 |  |
Notes receivable, net | 109,613 | 153,829 | $ 276,163 | $ 147,188
Nonperforming Financial Instruments |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Proceeds from notes receivable |  | 12,000 |  |
Fund III |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Additional advance | 200 | 600 |  |
Fund II |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Note receivable accrued interest | 800 | 800 |  |
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 |  |  |
Notes receivable, net | 56,475 | 101,695 |  |
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 | Notes Receivable of $10 million |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Additional advance |  | 10,000 |  |
Notes receivable, net |  | 20,000 |  |
Core Portfolio | Note Receivable, Due June 1, 2018 |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Notes receivable, net |  | 15,000 |  |
Town Center | Core Portfolio |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Note receivable exchanged | 22,000 |  |  |
Note receivable accrued interest | $ 300 |  |  |
Market Square and Town Center Properties | Core Portfolio |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Note receivable exchanged |  | 92,700 |  |
Note receivable accrued interest |  | 1,800 |  |
Shopping Center in Windham, ME |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Note receivable exchanged |  | 9,000 |  |
Note receivable accrued interest |  | $ 100 |  |

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