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Combined Guarantor Subsidiaries - Mortgage and Other Notes Receivable - Summary (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items] |  |
Balance | $ 4,662,000 | $ 7,672,000
Mortgage Receivable |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Balance | 2,637,000 | 4,884,000
Other Notes Receivable |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Balance | 2,025,000 | 2,788,000
Guarantor Subsidiaries |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Balance | 75,016,000 | 76,747,000
Guarantor Subsidiaries | Mortgage Receivable |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Balance | $ 73,786,000 | $ 75,517,000
Guarantor Subsidiaries | Mortgage Receivable | The Promenade |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Maturity Date | 2020-06 |
Interest Rate (as a percent) | 5.00% | 5.00%
Balance | $ 47,514,000 | $ 47,514,000
Guarantor Subsidiaries | Mortgage Receivable | Hamilton Corner |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Maturity Date | 2020-02 |
Interest Rate (as a percent) | 5.67% | 5.67%
Balance | $ 14,295,000 | $ 14,295,000
Guarantor Subsidiaries | Mortgage Receivable | The Terrace |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Maturity Date | 2020-06 |
Interest Rate (as a percent) | 7.25% |
Balance | $ 11,977,000 |
Guarantor Subsidiaries | Mortgage Receivable | Madison Grandview Forum, LLC |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Maturity Date | 2023-09 |
Interest Rate (as a percent) | 5.25% | 5.25%
Balance |  | $ 12,400,000
Guarantor Subsidiaries | Mortgage Receivable | Village Square |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Maturity Date | 2019-09 |
Interest Rate (as a percent) |  | 4.00%
Balance |  | $ 1,308,000
Guarantor Subsidiaries | Other Notes Receivable |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Balance | $ 75,016,000 | $ 76,747,000
Guarantor Subsidiaries | Other Notes Receivable | Community improvement district |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Maturity Date | 2028-08 |
Interest Rate (as a percent) | 6.75% | 7.50%
Balance | $ 1,230,000 | $ 1,230,000

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- Definition Notes receivable maturity month and year. + References No definition available. + Details
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- Definition Interest rate of mortgage loan within 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column B -Subsection 29 Reference 2: 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(Column B)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 + Details
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