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SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION - Schedule of Real Estate and Accumulated Depreciation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 1,017,288      
Initial Cost to Company of Land 769,582      
Initial Cost to Company of Buildings and Improvements 2,079,002      
Increase (Decrease) in Net Investments 849,221      
Carrying Amount of Land 775,766      
Carrying Amount of Buildings and Improvements 2,922,039      
Total Carrying Amount 3,697,805 $ 3,466,482 $ 3,382,000 $ 2,736,283
Accumulated Depreciation 416,657 339,862 $ 287,066 $ 298,703
Unamortized Loan Costs (10,173)      
Unamortized Premium 753 $ 856    
Real estate, federal income tax basis $ 3,400,000      
Buildings        
Real Estate And Accumulated Depreciation [Line Items]        
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Real Estate Under Development        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 47,645      
Initial Cost to Company of Land 65,297      
Initial Cost to Company of Buildings and Improvements 31,473      
Increase (Decrease) in Net Investments 23,527      
Carrying Amount of Land 65,297      
Carrying Amount of Buildings and Improvements 55,000      
Total Carrying Amount 120,297      
Core Portfolio | Crescent Plaza Brockton, MA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land 1,147      
Initial Cost to Company of Buildings and Improvements 7,425      
Increase (Decrease) in Net Investments 3,222      
Carrying Amount of Land 1,147      
Carrying Amount of Buildings and Improvements 10,647      
Total Carrying Amount 11,794      
Accumulated Depreciation $ 8,112      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | New Loudon Center Latham, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 505      
Initial Cost to Company of Buildings and Improvements 4,161      
Increase (Decrease) in Net Investments 13,965      
Carrying Amount of Land 505      
Carrying Amount of Buildings and Improvements 18,126      
Total Carrying Amount 18,631      
Accumulated Depreciation $ 14,890      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Mark Plaza Edwardsville, PA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Buildings and Improvements $ 3,396      
Carrying Amount of Buildings and Improvements 3,396      
Total Carrying Amount 3,396      
Accumulated Depreciation $ 2,981      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Plaza 422 Lebanon, PA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 190      
Initial Cost to Company of Buildings and Improvements 3,004      
Increase (Decrease) in Net Investments 2,809      
Carrying Amount of Land 190      
Carrying Amount of Buildings and Improvements 5,813      
Total Carrying Amount 6,003      
Accumulated Depreciation $ 5,227      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Route 6 Mall Honesdale, PA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,664      
Increase (Decrease) in Net Investments 12,490      
Carrying Amount of Land 1,664      
Carrying Amount of Buildings and Improvements 12,490      
Total Carrying Amount 14,154      
Accumulated Depreciation $ 9,813      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Abington Towne Center Abington, PA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 799      
Initial Cost to Company of Buildings and Improvements 3,197      
Increase (Decrease) in Net Investments 2,876      
Carrying Amount of Land 799      
Carrying Amount of Buildings and Improvements 6,073      
Total Carrying Amount 6,872      
Accumulated Depreciation $ 4,016      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Bloomfield Town Square Bloomfield Hills, MI        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 3,207      
Initial Cost to Company of Buildings and Improvements 13,774      
Increase (Decrease) in Net Investments 25,803      
Carrying Amount of Land 3,207      
Carrying Amount of Buildings and Improvements 39,577      
Total Carrying Amount 42,784      
Accumulated Depreciation $ 23,366      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Elmwood Park Shopping Center Elmwood Park, NJ        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 3,248      
Initial Cost to Company of Buildings and Improvements 12,992      
Increase (Decrease) in Net Investments 15,738      
Carrying Amount of Land 3,798      
Carrying Amount of Buildings and Improvements 28,180      
Total Carrying Amount 31,978      
Accumulated Depreciation $ 19,867      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Merrillville Plaza Hobart, IN        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 4,288      
Initial Cost to Company of Buildings and Improvements 17,152      
Increase (Decrease) in Net Investments 5,726      
Carrying Amount of Land 4,288      
Carrying Amount of Buildings and Improvements 22,878      
Total Carrying Amount 27,166      
Accumulated Depreciation $ 13,173      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Marketplace of Absecon Absecon, NJ        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 2,573      
Initial Cost to Company of Buildings and Improvements 10,294      
Increase (Decrease) in Net Investments 4,920      
Carrying Amount of Land 2,577      
Carrying Amount of Buildings and Improvements 15,210      
Total Carrying Amount 17,787      
Accumulated Depreciation $ 8,603      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 239 Greenwich Avenue Greenwich, CT        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 27,000      
Initial Cost to Company of Land 1,817      
Initial Cost to Company of Buildings and Improvements 15,846      
Increase (Decrease) in Net Investments 1,086      
Carrying Amount of Land 1,817      
Carrying Amount of Buildings and Improvements 16,932      
Total Carrying Amount 18,749      
Accumulated Depreciation $ 8,285      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Hobson West Plaza Naperville, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,793      
Initial Cost to Company of Buildings and Improvements 7,172      
Increase (Decrease) in Net Investments 4,069      
Carrying Amount of Land 1,793      
Carrying Amount of Buildings and Improvements 11,241      
Total Carrying Amount 13,034      
Accumulated Depreciation $ 5,431      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Village Commons Shopping Center Smithtown, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 3,229      
Initial Cost to Company of Buildings and Improvements 12,917      
Increase (Decrease) in Net Investments 4,597      
Carrying Amount of Land 3,229      
Carrying Amount of Buildings and Improvements 17,514      
Total Carrying Amount 20,743      
Accumulated Depreciation $ 9,918      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Town Line Plaza Rocky Hill, CT        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 878      
Initial Cost to Company of Buildings and Improvements 3,510      
Increase (Decrease) in Net Investments 7,736      
Carrying Amount of Land 907      
Carrying Amount of Buildings and Improvements 11,217      
Total Carrying Amount 12,124      
Accumulated Depreciation $ 9,206      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Branch Shopping Center Smithtown, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 3,156      
Initial Cost to Company of Buildings and Improvements 12,545      
Increase (Decrease) in Net Investments 16,119      
Carrying Amount of Land 3,401      
Carrying Amount of Buildings and Improvements 28,419      
Total Carrying Amount 31,820      
Accumulated Depreciation $ 12,757      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Methuen Shopping Center Methuen, MA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 956      
Initial Cost to Company of Buildings and Improvements 3,826      
Increase (Decrease) in Net Investments 1,484      
Carrying Amount of Land 961      
Carrying Amount of Buildings and Improvements 5,305      
Total Carrying Amount 6,266      
Accumulated Depreciation $ 2,683      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | The Gateway Shopping Center South Burlington, VT        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,273      
Initial Cost to Company of Buildings and Improvements 5,091      
Increase (Decrease) in Net Investments 12,413      
Carrying Amount of Land 1,273      
Carrying Amount of Buildings and Improvements 17,504      
Total Carrying Amount 18,777      
Accumulated Depreciation $ 10,169      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Mad River Station Dayton, OH        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 2,350      
Initial Cost to Company of Buildings and Improvements 9,404      
Increase (Decrease) in Net Investments 2,173      
Carrying Amount of Land 2,350      
Carrying Amount of Buildings and Improvements 11,577      
Total Carrying Amount 13,927      
Accumulated Depreciation $ 5,955      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Pacesetter Park Shopping Center Ramapo, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,475      
Initial Cost to Company of Buildings and Improvements 5,899      
Increase (Decrease) in Net Investments 3,743      
Carrying Amount of Land 1,475      
Carrying Amount of Buildings and Improvements 9,642      
Total Carrying Amount 11,117      
Accumulated Depreciation $ 5,439      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Town Center        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 26,250      
Initial Cost to Company of Land 5,063      
Initial Cost to Company of Buildings and Improvements 15,252      
Increase (Decrease) in Net Investments 2,495      
Carrying Amount of Land 5,201      
Carrying Amount of Buildings and Improvements 17,609      
Total Carrying Amount 22,810      
Accumulated Depreciation $ 7,199      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Bartow Avenue Bronx, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,691      
Initial Cost to Company of Buildings and Improvements 5,803      
Increase (Decrease) in Net Investments 1,190      
Carrying Amount of Land 1,691      
Carrying Amount of Buildings and Improvements 6,993      
Total Carrying Amount 8,684      
Accumulated Depreciation $ 3,250      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Amboy Road Staten Island, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Buildings and Improvements $ 11,909      
Increase (Decrease) in Net Investments 2,632      
Carrying Amount of Buildings and Improvements 14,541      
Total Carrying Amount 14,541      
Accumulated Depreciation $ 7,319      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Chestnut Hill Philadelphia, PA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 8,289      
Initial Cost to Company of Buildings and Improvements 5,691      
Increase (Decrease) in Net Investments 4,509      
Carrying Amount of Land 8,289      
Carrying Amount of Buildings and Improvements 10,200      
Total Carrying Amount 18,489      
Accumulated Depreciation $ 4,447      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 2914 Third Avenue Bronx, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 11,108      
Initial Cost to Company of Buildings and Improvements 8,038      
Increase (Decrease) in Net Investments 4,788      
Carrying Amount of Land 11,855      
Carrying Amount of Buildings and Improvements 12,079      
Total Carrying Amount 23,934      
Accumulated Depreciation $ 3,085      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | West Shore Expressway Staten Island, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 3,380      
Initial Cost to Company of Buildings and Improvements 13,499      
Carrying Amount of Land 3,380      
Carrying Amount of Buildings and Improvements 13,499      
Total Carrying Amount 16,879      
Accumulated Depreciation $ 4,496      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | West 54th Street Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 16,699      
Initial Cost to Company of Buildings and Improvements 18,704      
Increase (Decrease) in Net Investments 1,234      
Carrying Amount of Land 16,699      
Carrying Amount of Buildings and Improvements 19,938      
Total Carrying Amount 36,637      
Accumulated Depreciation $ 6,184      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 5-7 East 17th Street Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 3,048      
Initial Cost to Company of Buildings and Improvements 7,281      
Increase (Decrease) in Net Investments 6,133      
Carrying Amount of Land 3,048      
Carrying Amount of Buildings and Improvements 13,414      
Total Carrying Amount 16,462      
Accumulated Depreciation $ 2,855      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 651-671 W Diversey Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 8,576      
Initial Cost to Company of Buildings and Improvements 17,256      
Increase (Decrease) in Net Investments 8      
Carrying Amount of Land 8,576      
Carrying Amount of Buildings and Improvements 17,264      
Total Carrying Amount 25,840      
Accumulated Depreciation $ 3,273      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 15 Mercer Street New York, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,887      
Initial Cost to Company of Buildings and Improvements 2,483      
Carrying Amount of Land 1,887      
Carrying Amount of Buildings and Improvements 2,483      
Total Carrying Amount 4,370      
Accumulated Depreciation $ 466      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 4401 White Plains Bronx, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,581      
Initial Cost to Company of Buildings and Improvements 5,054      
Carrying Amount of Land 1,581      
Carrying Amount of Buildings and Improvements 5,054      
Total Carrying Amount 6,635      
Accumulated Depreciation $ 927      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Chicago Street Retail Portfolio        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 27,588      
Initial Cost to Company of Buildings and Improvements 52,274      
Increase (Decrease) in Net Investments 14,804      
Carrying Amount of Land 27,626      
Carrying Amount of Buildings and Improvements 67,040      
Total Carrying Amount 94,666      
Accumulated Depreciation $ 13,063      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 1520 Milwaukee Avenue Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 2,110      
Initial Cost to Company of Buildings and Improvements 1,306      
Increase (Decrease) in Net Investments 290      
Carrying Amount of Land 2,110      
Carrying Amount of Buildings and Improvements 1,596      
Total Carrying Amount 3,706      
Accumulated Depreciation $ 243      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 330-340 River St Cambridge, MA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 11,396      
Initial Cost to Company of Land 8,404      
Initial Cost to Company of Buildings and Improvements 14,235      
Carrying Amount of Land 8,404      
Carrying Amount of Buildings and Improvements 14,235      
Total Carrying Amount 22,639      
Accumulated Depreciation $ 2,547      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Rhode Island Place Shopping Center Washington, D.C.        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 7,458      
Initial Cost to Company of Buildings and Improvements 15,968      
Increase (Decrease) in Net Investments 1,924      
Carrying Amount of Land 7,458      
Carrying Amount of Buildings and Improvements 17,892      
Total Carrying Amount 25,350      
Accumulated Depreciation $ 3,314      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 930 Rush Street Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 4,933      
Initial Cost to Company of Buildings and Improvements 14,587      
Carrying Amount of Land 4,933      
Carrying Amount of Buildings and Improvements 14,587      
Total Carrying Amount 19,520      
Accumulated Depreciation $ 2,461      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 28 Jericho Turnpike Westbury, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 13,918      
Initial Cost to Company of Land 6,220      
Initial Cost to Company of Buildings and Improvements 24,416      
Carrying Amount of Land 6,220      
Carrying Amount of Buildings and Improvements 24,416      
Total Carrying Amount 30,636      
Accumulated Depreciation $ 4,215      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 181 Main Street Westport, CT        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,908      
Initial Cost to Company of Buildings and Improvements 12,158      
Increase (Decrease) in Net Investments 407      
Carrying Amount of Land 1,908      
Carrying Amount of Buildings and Improvements 12,565      
Total Carrying Amount 14,473      
Accumulated Depreciation $ 1,943      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 83 Spring Street Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,754      
Initial Cost to Company of Buildings and Improvements 9,200      
Carrying Amount of Land 1,754      
Carrying Amount of Buildings and Improvements 9,200      
Total Carrying Amount 10,954      
Accumulated Depreciation $ 1,495      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 60 Orange Street Bloomfield, NJ        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 7,266      
Initial Cost to Company of Land 3,609      
Initial Cost to Company of Buildings and Improvements 10,790      
Carrying Amount of Land 3,609      
Carrying Amount of Buildings and Improvements 10,790      
Total Carrying Amount 14,399      
Accumulated Depreciation $ 1,859      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 179-53 & 1801-03 Connecticut Avenue Washington, D.C.        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 11,690      
Initial Cost to Company of Buildings and Improvements 10,135      
Increase (Decrease) in Net Investments 1,014      
Carrying Amount of Land 11,690      
Carrying Amount of Buildings and Improvements 11,149      
Total Carrying Amount 22,839      
Accumulated Depreciation $ 1,863      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 639 West Diversey Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 4,429      
Initial Cost to Company of Buildings and Improvements 6,102      
Increase (Decrease) in Net Investments 916      
Carrying Amount of Land 4,429      
Carrying Amount of Buildings and Improvements 7,018      
Total Carrying Amount 11,447      
Accumulated Depreciation $ 1,283      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 664 North Michigan Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 15,240      
Initial Cost to Company of Buildings and Improvements 65,331      
Carrying Amount of Land 15,240      
Carrying Amount of Buildings and Improvements 65,331      
Total Carrying Amount 80,571      
Accumulated Depreciation $ 9,601      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 8-12 E. Walton Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 5,398      
Initial Cost to Company of Buildings and Improvements 15,601      
Increase (Decrease) in Net Investments 977      
Carrying Amount of Land 5,398      
Carrying Amount of Buildings and Improvements 16,578      
Total Carrying Amount 21,976      
Accumulated Depreciation $ 2,394      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 3200-3204 M Street Washington, DC        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 6,899      
Initial Cost to Company of Buildings and Improvements 4,249      
Increase (Decrease) in Net Investments 168      
Carrying Amount of Land 6,899      
Carrying Amount of Buildings and Improvements 4,417      
Total Carrying Amount 11,316      
Accumulated Depreciation $ 693      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 868 Broadway Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 3,519      
Initial Cost to Company of Buildings and Improvements 9,247      
Increase (Decrease) in Net Investments 5      
Carrying Amount of Land 3,519      
Carrying Amount of Buildings and Improvements 9,252      
Total Carrying Amount 12,771      
Accumulated Depreciation $ 1,174      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 313-315 Bowery Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Buildings and Improvements $ 5,516      
Carrying Amount of Buildings and Improvements 5,516      
Total Carrying Amount 5,516      
Accumulated Depreciation $ 1,116      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 120 West Broadway Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Buildings and Improvements $ 32,819      
Increase (Decrease) in Net Investments 1,116      
Carrying Amount of Buildings and Improvements 33,935      
Total Carrying Amount 33,935      
Accumulated Depreciation $ 2,798      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 11 E. Walton Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 16,744      
Initial Cost to Company of Buildings and Improvements 28,346      
Increase (Decrease) in Net Investments 192      
Carrying Amount of Land 16,744      
Carrying Amount of Buildings and Improvements 28,538      
Total Carrying Amount 45,282      
Accumulated Depreciation $ 3,648      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 61 Main St. Westport, CT        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 4,578      
Initial Cost to Company of Buildings and Improvements 2,645      
Increase (Decrease) in Net Investments 706      
Carrying Amount of Land 4,578      
Carrying Amount of Buildings and Improvements 3,351      
Total Carrying Amount 7,929      
Accumulated Depreciation $ 371      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 865 W. North Avenue Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,893      
Initial Cost to Company of Buildings and Improvements 11,594      
Increase (Decrease) in Net Investments 23      
Carrying Amount of Land 1,893      
Carrying Amount of Buildings and Improvements 11,617      
Total Carrying Amount 13,510      
Accumulated Depreciation $ 1,396      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 152-154 Spring St. Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 8,544      
Initial Cost to Company of Buildings and Improvements 27,001      
Carrying Amount of Land 8,544      
Carrying Amount of Buildings and Improvements 27,001      
Total Carrying Amount 35,545      
Accumulated Depreciation $ 3,184      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 2520 Flatbush Ave Brooklyn, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 6,613      
Initial Cost to Company of Buildings and Improvements 10,419      
Increase (Decrease) in Net Investments 248      
Carrying Amount of Land 6,613      
Carrying Amount of Buildings and Improvements 10,667      
Total Carrying Amount 17,280      
Accumulated Depreciation $ 1,299      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 252-256 Greenwich Avenue Greenwich, CT        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 10,175      
Initial Cost to Company of Buildings and Improvements 12,641      
Increase (Decrease) in Net Investments 544      
Carrying Amount of Land 10,175      
Carrying Amount of Buildings and Improvements 13,185      
Total Carrying Amount 23,360      
Accumulated Depreciation $ 1,647      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Bedford Green Bedford Hills, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 12,425      
Initial Cost to Company of Buildings and Improvements 32,730      
Increase (Decrease) in Net Investments 4,102      
Carrying Amount of Land 13,763      
Carrying Amount of Buildings and Improvements 35,494      
Total Carrying Amount 49,257      
Accumulated Depreciation $ 4,245      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 131-135 Prince Street Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Buildings and Improvements $ 57,536      
Increase (Decrease) in Net Investments 242      
Carrying Amount of Buildings and Improvements 57,778      
Total Carrying Amount 57,778      
Accumulated Depreciation $ 11,605      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Shops at Grand Ave Queens, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 20,264      
Initial Cost to Company of Buildings and Improvements 33,131      
Increase (Decrease) in Net Investments 1,965      
Carrying Amount of Land 20,264      
Carrying Amount of Buildings and Improvements 35,096      
Total Carrying Amount 55,360      
Accumulated Depreciation $ 3,651      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 201 Needham St. Newton, MA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 4,550      
Initial Cost to Company of Buildings and Improvements 4,459      
Increase (Decrease) in Net Investments 105      
Carrying Amount of Land 4,550      
Carrying Amount of Buildings and Improvements 4,564      
Total Carrying Amount 9,114      
Accumulated Depreciation $ 536      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | City Center San Francisco, CA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 36,063      
Initial Cost to Company of Buildings and Improvements 109,098      
Increase (Decrease) in Net Investments 16,814      
Carrying Amount of Land 36,063      
Carrying Amount of Buildings and Improvements 125,912      
Total Carrying Amount 161,975      
Accumulated Depreciation $ 10,585      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 163 Highland Avenue Needham, MA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 8,852      
Initial Cost to Company of Land 12,679      
Initial Cost to Company of Buildings and Improvements 11,213      
Carrying Amount of Land 12,679      
Carrying Amount of Buildings and Improvements 11,213      
Total Carrying Amount 23,892      
Accumulated Depreciation $ 1,198      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Roosevelt Galleria Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 4,838      
Initial Cost to Company of Buildings and Improvements 14,574      
Increase (Decrease) in Net Investments 13      
Carrying Amount of Land 4,838      
Carrying Amount of Buildings and Improvements 14,587      
Total Carrying Amount 19,425      
Accumulated Depreciation $ 1,223      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Route 202 Shopping Center Wilmington, DE        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Buildings and Improvements $ 6,346      
Increase (Decrease) in Net Investments 501      
Carrying Amount of Buildings and Improvements 6,847      
Total Carrying Amount 6,847      
Accumulated Depreciation $ 673      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 991 Madison Avenue New York, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Buildings and Improvements $ 76,965      
Increase (Decrease) in Net Investments 1,506      
Carrying Amount of Buildings and Improvements 78,471      
Total Carrying Amount 78,471      
Accumulated Depreciation $ 4,413      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 165 Newbury Street - Boston, MA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,918      
Initial Cost to Company of Buildings and Improvements 3,980      
Carrying Amount of Land 1,918      
Carrying Amount of Buildings and Improvements 3,980      
Total Carrying Amount 5,898      
Accumulated Depreciation $ 265      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Concord & Milwaukee - Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 2,728      
Initial Cost to Company of Land 2,739      
Initial Cost to Company of Buildings and Improvements 2,746      
Carrying Amount of Land 2,739      
Carrying Amount of Buildings and Improvements 2,746      
Total Carrying Amount 5,485      
Accumulated Depreciation $ 175      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | State & Washington - Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 24,439      
Initial Cost to Company of Land 3,907      
Initial Cost to Company of Buildings and Improvements 70,943      
Increase (Decrease) in Net Investments 20      
Carrying Amount of Land 3,907      
Carrying Amount of Buildings and Improvements 70,963      
Total Carrying Amount 74,870      
Accumulated Depreciation $ 4,138      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 151 North State Street - Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 13,882      
Initial Cost to Company of Land 1,941      
Initial Cost to Company of Buildings and Improvements 25,529      
Carrying Amount of Land 1,941      
Carrying Amount of Buildings and Improvements 25,529      
Total Carrying Amount 27,470      
Accumulated Depreciation $ 1,542      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | North & Kingsbury - Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 12,555      
Initial Cost to Company of Land 18,731      
Initial Cost to Company of Buildings and Improvements 16,292      
Increase (Decrease) in Net Investments 52      
Carrying Amount of Land 18,731      
Carrying Amount of Buildings and Improvements 16,344      
Total Carrying Amount 35,075      
Accumulated Depreciation $ 989      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Sullivan Center - Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 50,000      
Initial Cost to Company of Land 13,443      
Initial Cost to Company of Buildings and Improvements 137,327      
Increase (Decrease) in Net Investments 419      
Carrying Amount of Land 13,443      
Carrying Amount of Buildings and Improvements 137,746      
Total Carrying Amount 151,189      
Accumulated Depreciation $ 8,052      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | California & Armitage - Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 2,566      
Initial Cost to Company of Land 6,770      
Initial Cost to Company of Buildings and Improvements 2,292      
Increase (Decrease) in Net Investments 2      
Carrying Amount of Land 6,770      
Carrying Amount of Buildings and Improvements 2,294      
Total Carrying Amount 9,064      
Accumulated Depreciation $ 148      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | 555 9th Street - San Francisco, CA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 60,000      
Initial Cost to Company of Land 75,591      
Initial Cost to Company of Buildings and Improvements 73,268      
Increase (Decrease) in Net Investments 1      
Carrying Amount of Land 75,591      
Carrying Amount of Buildings and Improvements 73,269      
Total Carrying Amount 148,860      
Accumulated Depreciation $ 4,000      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Market Square Wilmington, DE        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 8,100      
Initial Cost to Company of Buildings and Improvements 31,221      
Increase (Decrease) in Net Investments 228      
Carrying Amount of Land 8,100      
Carrying Amount of Buildings and Improvements 31,449      
Total Carrying Amount 39,549      
Accumulated Depreciation $ 937      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Core Portfolio | Undeveloped Land        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 100      
Carrying Amount of Land 100      
Total Carrying Amount 100      
Opportunity Funds | Fund II | City Point Brooklyn, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances 224,587      
Initial Cost to Company of Buildings and Improvements 100,316      
Increase (Decrease) in Net Investments 468,337      
Carrying Amount of Buildings and Improvements 568,653      
Total Carrying Amount 568,653      
Accumulated Depreciation $ 29,640      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund III | 654 Broadway Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 9,040      
Initial Cost to Company of Buildings and Improvements 3,654      
Increase (Decrease) in Net Investments 3,497      
Carrying Amount of Land 9,040      
Carrying Amount of Buildings and Improvements 7,151      
Total Carrying Amount 16,191      
Accumulated Depreciation $ 1,209      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund III | 640 Broadway Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 49,470      
Initial Cost to Company of Land 12,503      
Initial Cost to Company of Buildings and Improvements 19,960      
Increase (Decrease) in Net Investments 14,304      
Carrying Amount of Land 12,503      
Carrying Amount of Buildings and Improvements 34,264      
Total Carrying Amount 46,767      
Accumulated Depreciation $ 5,798      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund III | Cortlandt Crossing Mohegan Lake, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 26,000      
Initial Cost to Company of Land 11,000      
Increase (Decrease) in Net Investments 64,870      
Carrying Amount of Land 12,750      
Carrying Amount of Buildings and Improvements 63,120      
Total Carrying Amount 75,870      
Accumulated Depreciation $ 415      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund III | 3104 M St. Washington, DC        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 4,531      
Initial Cost to Company of Land 750      
Initial Cost to Company of Buildings and Improvements 2,115      
Increase (Decrease) in Net Investments 5,162      
Carrying Amount of Land 750      
Carrying Amount of Buildings and Improvements 7,277      
Total Carrying Amount 8,027      
Accumulated Depreciation $ 566      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund III | 3780-3858 Nostrand Avenue Brooklyn, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 10,097      
Initial Cost to Company of Land 6,229      
Initial Cost to Company of Buildings and Improvements 11,216      
Increase (Decrease) in Net Investments 6,365      
Carrying Amount of Land 6,229      
Carrying Amount of Buildings and Improvements 17,581      
Total Carrying Amount 23,810      
Accumulated Depreciation $ 2,857      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 210 Bowery Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 1,875      
Initial Cost to Company of Buildings and Improvements 5,625      
Increase (Decrease) in Net Investments 6,021      
Carrying Amount of Land 1,875      
Carrying Amount of Buildings and Improvements 11,646      
Total Carrying Amount 13,521      
Accumulated Depreciation $ 26      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | Paramus Plaza Paramus, NJ        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 17,627      
Initial Cost to Company of Land 11,052      
Initial Cost to Company of Buildings and Improvements 7,037      
Increase (Decrease) in Net Investments 11,934      
Carrying Amount of Land 11,052      
Carrying Amount of Buildings and Improvements 18,971      
Total Carrying Amount 30,023      
Accumulated Depreciation $ 2,836      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 938 W. North Avenue Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 14,100      
Initial Cost to Company of Land 2,314      
Initial Cost to Company of Buildings and Improvements 17,067      
Increase (Decrease) in Net Investments 5,362      
Carrying Amount of Land 2,314      
Carrying Amount of Buildings and Improvements 22,429      
Total Carrying Amount 24,743      
Accumulated Depreciation $ 2,473      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 27 E. 61st Street Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 4,813      
Initial Cost to Company of Buildings and Improvements 14,438      
Increase (Decrease) in Net Investments 7,100      
Carrying Amount of Land 4,813      
Carrying Amount of Buildings and Improvements 21,538      
Total Carrying Amount 26,351      
Accumulated Depreciation $ 666      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 17 E. 71st Street Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 18,906      
Initial Cost to Company of Land 7,391      
Initial Cost to Company of Buildings and Improvements 20,176      
Increase (Decrease) in Net Investments 280      
Carrying Amount of Land 7,391      
Carrying Amount of Buildings and Improvements 20,456      
Total Carrying Amount 27,847      
Accumulated Depreciation $ 2,211      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 1035 Third Ave Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 38,434      
Initial Cost to Company of Land 12,759      
Initial Cost to Company of Buildings and Improvements 37,431      
Increase (Decrease) in Net Investments 5,386      
Carrying Amount of Land 14,099      
Carrying Amount of Buildings and Improvements 41,477      
Total Carrying Amount 55,576      
Accumulated Depreciation $ 4,222      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 801 Madison Avenue Manhattan, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 4,178      
Initial Cost to Company of Buildings and Improvements 28,470      
Increase (Decrease) in Net Investments 5,608      
Carrying Amount of Land 4,178      
Carrying Amount of Buildings and Improvements 34,078      
Total Carrying Amount 38,256      
Accumulated Depreciation $ 1,054      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 2208-2216 Fillmore Street San Francisco, CA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 5,606      
Initial Cost to Company of Land 3,027      
Initial Cost to Company of Buildings and Improvements 6,376      
Increase (Decrease) in Net Investments 32      
Carrying Amount of Land 3,027      
Carrying Amount of Buildings and Improvements 6,408      
Total Carrying Amount 9,435      
Accumulated Depreciation $ 511      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 146 Geary Street San Francisco, CA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 27,700      
Initial Cost to Company of Land 9,500      
Initial Cost to Company of Buildings and Improvements 28,500      
Increase (Decrease) in Net Investments 489      
Carrying Amount of Land 9,500      
Carrying Amount of Buildings and Improvements 28,989      
Total Carrying Amount 38,489      
Accumulated Depreciation $ 2,257      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 2207 Fillmore Street San Francisco, CA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 1,120      
Initial Cost to Company of Land 1,498      
Initial Cost to Company of Buildings and Improvements 1,735      
Increase (Decrease) in Net Investments 118      
Carrying Amount of Land 1,498      
Carrying Amount of Buildings and Improvements 1,853      
Total Carrying Amount 3,351      
Accumulated Depreciation $ 143      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 1964 Union Street San Francisco, CA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 1,463      
Initial Cost to Company of Land 563      
Initial Cost to Company of Buildings and Improvements 1,688      
Increase (Decrease) in Net Investments 1,867      
Carrying Amount of Land 563      
Carrying Amount of Buildings and Improvements 3,555      
Total Carrying Amount 4,118      
Accumulated Depreciation $ 121      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | Restaurants at Fort Point - Boston, MA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 6,201      
Initial Cost to Company of Land 1,041      
Initial Cost to Company of Buildings and Improvements 10,905      
Carrying Amount of Land 1,041      
Carrying Amount of Buildings and Improvements 10,905      
Total Carrying Amount 11,946      
Accumulated Depreciation $ 818      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | Wake Forest Crossing - Wake Forest, NC        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 23,706      
Initial Cost to Company of Land 7,570      
Initial Cost to Company of Buildings and Improvements 24,829      
Increase (Decrease) in Net Investments 220      
Carrying Amount of Land 7,570      
Carrying Amount of Buildings and Improvements 25,049      
Total Carrying Amount 32,619      
Accumulated Depreciation $ 1,799      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | Airport Mall - Bangor, ME        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 5,476      
Initial Cost to Company of Land 2,294      
Initial Cost to Company of Buildings and Improvements 7,067      
Increase (Decrease) in Net Investments 458      
Carrying Amount of Land 2,294      
Carrying Amount of Buildings and Improvements 7,525      
Total Carrying Amount 9,819      
Accumulated Depreciation $ 526      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | Colonie Plaza - Albany, NY        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 11,890      
Initial Cost to Company of Land 2,852      
Initial Cost to Company of Buildings and Improvements 9,619      
Increase (Decrease) in Net Investments 271      
Carrying Amount of Land 2,852      
Carrying Amount of Buildings and Improvements 9,890      
Total Carrying Amount 12,742      
Accumulated Depreciation $ 632      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | Dauphin Plaza - Harrisburg, PA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 10,021      
Initial Cost to Company of Land 5,290      
Initial Cost to Company of Buildings and Improvements 9,464      
Increase (Decrease) in Net Investments 2,235      
Carrying Amount of Land 5,290      
Carrying Amount of Buildings and Improvements 11,699      
Total Carrying Amount 16,989      
Accumulated Depreciation $ 793      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | JFK Plaza - Waterville, ME        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 4,381      
Initial Cost to Company of Land 751      
Initial Cost to Company of Buildings and Improvements 5,991      
Increase (Decrease) in Net Investments 9      
Carrying Amount of Land 751      
Carrying Amount of Buildings and Improvements 6,000      
Total Carrying Amount 6,751      
Accumulated Depreciation $ 412      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | Mayfair Shopping Center - Philadelphia, PA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 6,178      
Initial Cost to Company of Buildings and Improvements 9,266      
Increase (Decrease) in Net Investments 741      
Carrying Amount of Land 6,178      
Carrying Amount of Buildings and Improvements 10,007      
Total Carrying Amount 16,185      
Accumulated Depreciation $ 602      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | Shaw's Plaza Waterville, ME        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 7,840      
Initial Cost to Company of Land 828      
Initial Cost to Company of Buildings and Improvements 11,814      
Increase (Decrease) in Net Investments 56      
Carrying Amount of Land 828      
Carrying Amount of Buildings and Improvements 11,870      
Total Carrying Amount 12,698      
Accumulated Depreciation $ 721      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | Wells Plaza - Wells, ME        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 3,286      
Initial Cost to Company of Land 1,892      
Initial Cost to Company of Buildings and Improvements 2,585      
Increase (Decrease) in Net Investments 236      
Carrying Amount of Land 1,892      
Carrying Amount of Buildings and Improvements 2,821      
Total Carrying Amount 4,713      
Accumulated Depreciation $ 245      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | 717 N Michigan - Chicago, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 18,972      
Initial Cost to Company of Land 20,674      
Initial Cost to Company of Buildings and Improvements 10,093      
Increase (Decrease) in Net Investments 1      
Carrying Amount of Land 20,674      
Carrying Amount of Buildings and Improvements 10,094      
Total Carrying Amount 30,768      
Accumulated Depreciation $ 523      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | Shaw's Plaza North Windham, ME        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 5,848      
Initial Cost to Company of Land 1,876      
Initial Cost to Company of Buildings and Improvements 6,696      
Increase (Decrease) in Net Investments 1      
Carrying Amount of Land 1,876      
Carrying Amount of Buildings and Improvements 6,697      
Total Carrying Amount 8,573      
Accumulated Depreciation $ 281      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | Lincoln Place Fairview Heights, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 23,100      
Initial Cost to Company of Land 7,149      
Initial Cost to Company of Buildings and Improvements 22,201      
Increase (Decrease) in Net Investments 920      
Carrying Amount of Land 7,149      
Carrying Amount of Buildings and Improvements 23,121      
Total Carrying Amount 30,270      
Accumulated Depreciation $ 1,218      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund IV | BSP I        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 19,773      
Initial Cost to Company of Land 9,930      
Initial Cost to Company of Buildings and Improvements 21,905      
Carrying Amount of Land 9,930      
Carrying Amount of Buildings and Improvements 21,905      
Total Carrying Amount 31,835      
Accumulated Depreciation $ 136      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund V | Plaza Santa Fe Santa Fe, NM        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 22,893      
Initial Cost to Company of Buildings and Improvements 28,214      
Increase (Decrease) in Net Investments 69      
Carrying Amount of Buildings and Improvements 28,283      
Total Carrying Amount 28,283      
Accumulated Depreciation $ 1,228      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund V | Hickory Ridge - Hickory, NC        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 28,613      
Initial Cost to Company of Land 7,852      
Initial Cost to Company of Buildings and Improvements 29,998      
Increase (Decrease) in Net Investments 75      
Carrying Amount of Land 7,852      
Carrying Amount of Buildings and Improvements 30,073      
Total Carrying Amount 37,925      
Accumulated Depreciation $ 1,166      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund V | New Towne Plaza - Canton, MI        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 16,900      
Initial Cost to Company of Land 5,040      
Initial Cost to Company of Buildings and Improvements 17,391      
Increase (Decrease) in Net Investments 106      
Carrying Amount of Land 5,040      
Carrying Amount of Buildings and Improvements 17,497      
Total Carrying Amount 22,537      
Accumulated Depreciation $ 713      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund V | Fairlane Green Allen Park, MI        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 40,300      
Initial Cost to Company of Land 18,121      
Initial Cost to Company of Buildings and Improvements 37,143      
Increase (Decrease) in Net Investments 247      
Carrying Amount of Land 18,121      
Carrying Amount of Buildings and Improvements 37,390      
Total Carrying Amount 55,511      
Accumulated Depreciation $ 1,026      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund V | Trussville Promenade Birmingham, AL        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 29,370      
Initial Cost to Company of Land 7,587      
Initial Cost to Company of Buildings and Improvements 34,285      
Carrying Amount of Land 7,587      
Carrying Amount of Buildings and Improvements 34,285      
Total Carrying Amount 41,872      
Accumulated Depreciation $ 778      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund V | Elk Grove Commons Elk Grove, CA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 6,204      
Initial Cost to Company of Buildings and Improvements 48,008      
Increase (Decrease) in Net Investments 28      
Carrying Amount of Land 6,204      
Carrying Amount of Buildings and Improvements 48,036      
Total Carrying Amount 54,240      
Accumulated Depreciation $ 525      
Life on which Depreciation in Latest Statement of Income is Compared 40 years      
Opportunity Funds | Fund V | Hiram Pavilion I & II Hiram, GA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost to Company of Land $ 13,029      
Initial Cost to Company of Buildings and Improvements 25,446      
Increase (Decrease) in Net Investments 27      
Carrying Amount of Land 13,029      
Carrying Amount of Buildings and Improvements 25,473      
Total Carrying Amount 38,502      
Accumulated Depreciation $ 137      
Life on which Depreciation in Latest Statement of Income is Compared 40 years