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Notes Receivable, Net - Additional Information (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Note receivable accrued interest | $ 4,700 |  | $ 4,700
Proceeds from notes receivable | 15,250 | $ 26,000 |
Additional advance | 131,459 | $ 119,752 |
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
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
Town Center | Core Portfolio |  |  |
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 | 300 |  | 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] |  |  |
Additional advance |  |  | $ 200

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- Definition Amount of decrease in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Footnote 6)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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