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Schedule III - Real Estate and Accumulated Depreciation (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,537,390      
Initial Cost to Company        
Land 640,957      
Buildings 1,958,193      
Cost Capitalized Subsequent to Acquisition 375,603      
Increase (Decrease) in Net Investments (315,876)      
Gross Amount at which Carried at Close of Period        
Land 560,257      
Buildings 2,098,620      
Total 2,658,877      
Accumulated Depreciation 225,867      
Direct Financing Method        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 204,292      
Initial Cost to Company        
Land 22,013      
Buildings 469,166      
Cost Capitalized Subsequent to Acquisition 18,245      
Increase (Decrease) in Net Investments (13,860)      
Gross Amount at which Carried at Close of Period        
Total 495,564      
Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 152,589      
Initial Cost to Company        
Land 66,066      
Buildings 202,281      
Cost Capitalized Subsequent to Acquisition 7,178      
Increase (Decrease) in Net Investments (4)      
Gross Amount at which Carried at Close of Period        
Land 66,066      
Buildings 209,455      
Total 275,521 $ 272,859 $ 283,370 $ 254,805
Accumulated Depreciation 30,308 $ 22,217 $ 15,354 $ 7,757
Industrial facility in Norfolk, NE | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 1,503      
Initial Cost to Company        
Land 625      
Buildings 1,713      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 107      
Gross Amount at which Carried at Close of Period        
Land 625      
Buildings 1,820      
Total 2,445      
Accumulated Depreciation $ 460      
Life on which Depreciation in Latest Statement of Income is Computed 30 years      
Office facility in Soest, Germany and warehouse facility in Bad Wünnenberg, Germany | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company        
Land 3,193      
Buildings 45,932      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (15,335)      
Gross Amount at which Carried at Close of Period        
Land 2,196      
Buildings 31,594      
Total 33,790      
Accumulated Depreciation $ 6,315      
Life on which Depreciation in Latest Statement of Income is Computed 36 years      
Learning center in Chicago, IL | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 13,245      
Initial Cost to Company        
Land 6,300      
Buildings 20,509      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (527)      
Gross Amount at which Carried at Close of Period        
Land 6,300      
Buildings 19,982      
Total 26,282      
Accumulated Depreciation $ 4,995      
Life on which Depreciation in Latest Statement of Income is Computed 30 years      
Industrial facilities in Sergeant Bluff, IA; Bossier City, LA; and Alvarado, TX | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 29,475      
Initial Cost to Company        
Land 2,725      
Buildings 25,233      
Cost Capitalized Subsequent to Acquisition 28,116      
Increase (Decrease) in Net Investments (3,395)      
Gross Amount at which Carried at Close of Period        
Land 4,701      
Buildings 47,978      
Total 52,679      
Accumulated Depreciation 6,529      
Industrial facility in Waldaschaff, Germany | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company        
Land 10,373      
Buildings 16,708      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (13,122)      
Gross Amount at which Carried at Close of Period        
Land 5,294      
Buildings 8,665      
Total 13,959      
Accumulated Depreciation $ 3,904      
Life on which Depreciation in Latest Statement of Income is Computed 15 years      
Sports facilities in Phoenix, AZ and Columbia, MD | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 35,396      
Initial Cost to Company        
Land 14,500      
Buildings 48,865      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (2,062)      
Gross Amount at which Carried at Close of Period        
Land 14,500      
Buildings 46,803      
Total 61,303      
Accumulated Depreciation $ 8,485      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Office facility in Birmingham, United Kingdom | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 12,350      
Initial Cost to Company        
Land 3,591      
Buildings 15,810      
Cost Capitalized Subsequent to Acquisition 949      
Increase (Decrease) in Net Investments (1,616)      
Gross Amount at which Carried at Close of Period        
Land 3,283      
Buildings 15,451      
Total 18,734      
Accumulated Depreciation $ 2,332      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Retail facilities in Gorzow, Poland | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 5,963      
Initial Cost to Company        
Land 1,095      
Buildings 13,947      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (3,899)      
Gross Amount at which Carried at Close of Period        
Land 812      
Buildings 10,331      
Total 11,143      
Accumulated Depreciation $ 1,618      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Office facility in Hoffman Estates, IL | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 18,619      
Initial Cost to Company        
Land 5,000      
Buildings 21,764      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 5,000      
Buildings 21,764      
Total 26,764      
Accumulated Depreciation $ 3,301      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Office facility in The Woodlands, TX | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 36,386      
Initial Cost to Company        
Land 1,400      
Buildings 41,502      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,400      
Buildings 41,502      
Total 42,902      
Accumulated Depreciation $ 6,311      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Retail facilities located throughout Spain | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 36,406      
Initial Cost to Company        
Land 32,574      
Buildings 52,101      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (18,452)      
Gross Amount at which Carried at Close of Period        
Land 25,331      
Buildings 40,892      
Total 66,223      
Accumulated Depreciation $ 6,124      
Life on which Depreciation in Latest Statement of Income is Computed 20 years      
Industrial facilities in Middleburg Heights and Union Township, OH | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 5,902      
Initial Cost to Company        
Land 1,000      
Buildings 10,793      
Cost Capitalized Subsequent to Acquisition 2      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,000      
Buildings 10,795      
Total 11,795      
Accumulated Depreciation $ 1,596      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Industrial facilities in Phoenix, AZ; Colton, Fresno, Los Angeles, Orange, Pomona, and San Diego, CA; Safety Harbor, FL; Durham, NC; and Columbia, SC | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 13,008      
Initial Cost to Company        
Land 19,001      
Buildings 13,059      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 19,001      
Buildings 13,059      
Total 32,060      
Accumulated Depreciation 2,210      
Industrial facility in Evansville, IN | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 15,942      
Initial Cost to Company        
Land 150      
Buildings 9,183      
Cost Capitalized Subsequent to Acquisition 11,745      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 150      
Buildings 20,928      
Total 21,078      
Accumulated Depreciation $ 2,741      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Warehouse facilities in Bristol, Cannock, Liverpool, Luton, Plymouth, Southampton, and Taunton, United Kingdom | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 4,780      
Initial Cost to Company        
Land 8,639      
Buildings 2,019      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (374)      
Gross Amount at which Carried at Close of Period        
Land 8,321      
Buildings 1,963      
Total 10,284      
Accumulated Depreciation $ 398      
Life on which Depreciation in Latest Statement of Income is Computed 28 years      
Warehouse facilities in Zagreb, Croatia | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 38,247      
Initial Cost to Company        
Land 31,941      
Buildings 45,904      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (13,148)      
Gross Amount at which Carried at Close of Period        
Land 26,395      
Buildings 38,302      
Total 64,697      
Accumulated Depreciation $ 7,236      
Life on which Depreciation in Latest Statement of Income is Computed 30 years      
Office facilities in Tampa, FL | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 33,494      
Initial Cost to Company        
Land 18,300      
Buildings 32,856      
Cost Capitalized Subsequent to Acquisition 1,161      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 18,323      
Buildings 33,994      
Total 52,317      
Accumulated Depreciation $ 4,647      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Warehouse facility in Bowling Green, KY | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 26,589      
Initial Cost to Company        
Land 1,400      
Buildings 3,946      
Cost Capitalized Subsequent to Acquisition 33,809      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,400      
Buildings 37,755      
Total 39,155      
Accumulated Depreciation $ 4,092      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Retail facility in Elorrio, Spain | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company        
Land 19,924      
Buildings 3,981      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (2,180)      
Gross Amount at which Carried at Close of Period        
Land 18,013      
Buildings 3,712      
Total 21,725      
Accumulated Depreciation $ 510      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Warehouse facility in Gadki, Poland | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 3,983      
Initial Cost to Company        
Land 1,134      
Buildings 1,183      
Cost Capitalized Subsequent to Acquisition 7,611      
Increase (Decrease) in Net Investments (2,269)      
Gross Amount at which Carried at Close of Period        
Land 872      
Buildings 6,787      
Total 7,659      
Accumulated Depreciation $ 805      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Industrial and office facilities in Elberton, GA | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company        
Land 560      
Buildings 2,467      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 560      
Buildings 2,467      
Total 3,027      
Accumulated Depreciation $ 379      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Warehouse facilities in Rincon and Unadilla, GA | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 25,450      
Initial Cost to Company        
Land 1,595      
Buildings 44,446      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,595      
Buildings 44,446      
Total 46,041      
Accumulated Depreciation $ 5,740      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Office facility in Hartland, WI | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 3,338      
Initial Cost to Company        
Land 1,402      
Buildings 2,041      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,402      
Buildings 2,041      
Total 3,443      
Accumulated Depreciation $ 301      
Life on which Depreciation in Latest Statement of Income is Computed 35 years      
Retail facilities in Kutina, Slavonski Brod, Spansko, and Zagreb, Croatia | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 16,530      
Initial Cost to Company        
Land 6,700      
Buildings 24,114      
Cost Capitalized Subsequent to Acquisition 194      
Increase (Decrease) in Net Investments (5,630)      
Gross Amount at which Carried at Close of Period        
Land 5,444      
Buildings 19,934      
Total 25,378      
Accumulated Depreciation $ 3,374      
Life on which Depreciation in Latest Statement of Income is Computed 30 years      
Warehouse facilities located throughout the United States | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 108,331      
Initial Cost to Company        
Land 31,735      
Buildings 129,011      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (9,680)      
Gross Amount at which Carried at Close of Period        
Land 28,511      
Buildings 122,555      
Total 151,066      
Accumulated Depreciation $ 17,592      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Office facility in Madrid, Spain | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company        
Land 22,230      
Buildings 81,508      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (17,749)      
Gross Amount at which Carried at Close of Period        
Land 18,423      
Buildings 67,566      
Total 85,989      
Accumulated Depreciation $ 8,444      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Office facility in Houston, TX | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 3,329      
Initial Cost to Company        
Land 1,838      
Buildings 2,432      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 20      
Gross Amount at which Carried at Close of Period        
Land 1,838      
Buildings 2,452      
Total 4,290      
Accumulated Depreciation $ 491      
Life on which Depreciation in Latest Statement of Income is Computed 25 years      
Retail facility in Las Vegas, NV | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 40,000      
Initial Cost to Company        
Land 26,934      
Buildings 31,037      
Cost Capitalized Subsequent to Acquisition 26,048      
Increase (Decrease) in Net Investments (44,166)      
Gross Amount at which Carried at Close of Period        
Land 5,070      
Buildings 34,783      
Total 39,853      
Accumulated Depreciation $ 3,053      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Warehouse facilities in Oxnard and Watsonville, CA | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 42,735      
Initial Cost to Company        
Land 16,036      
Buildings 67,300      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (7,149)      
Gross Amount at which Carried at Close of Period        
Land 16,036      
Buildings 60,151      
Total 76,187      
Accumulated Depreciation 8,371      
Warehouse facility in Dillon, SC | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 18,484      
Initial Cost to Company        
Land 1,355      
Buildings 15,620      
Cost Capitalized Subsequent to Acquisition 1,600      
Increase (Decrease) in Net Investments (69)      
Gross Amount at which Carried at Close of Period        
Land 1,286      
Buildings 17,220      
Total 18,506      
Accumulated Depreciation $ 1,952      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Warehouse facility in Middleburg Heights, OH | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company        
Land 600      
Buildings 1,690      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 600      
Buildings 1,690      
Total 2,290      
Accumulated Depreciation $ 201      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Office facility in Martinsville, VA | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 8,392      
Initial Cost to Company        
Land 600      
Buildings 1,998      
Cost Capitalized Subsequent to Acquisition 10,999      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 600      
Buildings 12,997      
Total 13,597      
Accumulated Depreciation $ 1,318      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Land in Chicago, IL | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 4,921      
Initial Cost to Company        
Land 7,414      
Buildings 0      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 7,414      
Buildings 0      
Total 7,414      
Accumulated Depreciation 0      
Industrial facility in Fraser, MI | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 4,093      
Initial Cost to Company        
Land 928      
Buildings 1,392      
Cost Capitalized Subsequent to Acquisition 6,193      
Increase (Decrease) in Net Investments (80)      
Gross Amount at which Carried at Close of Period        
Land 928      
Buildings 7,505      
Total 8,433      
Accumulated Depreciation $ 754      
Life on which Depreciation in Latest Statement of Income is Computed 35 years      
Retail facilities located throughout Italy | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 176,206      
Initial Cost to Company        
Land 91,691      
Buildings 262,377      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (69,024)      
Gross Amount at which Carried at Close of Period        
Land 73,390      
Buildings 211,654      
Total 285,044      
Accumulated Depreciation 24,784      
Retail facilities in Delnice, Pozega, and Sesvete, Croatia | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 18,868      
Initial Cost to Company        
Land 2,687      
Buildings 24,820      
Cost Capitalized Subsequent to Acquisition 15,378      
Increase (Decrease) in Net Investments (8,977)      
Gross Amount at which Carried at Close of Period        
Land 3,234      
Buildings 30,674      
Total 33,908      
Accumulated Depreciation $ 4,169      
Life on which Depreciation in Latest Statement of Income is Computed 30 years      
Retail facility in Orlando, FL | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company        
Land 32,739      
Buildings 0      
Cost Capitalized Subsequent to Acquisition 19,959      
Increase (Decrease) in Net Investments (32,739)      
Gross Amount at which Carried at Close of Period        
Land 5,577      
Buildings 14,382      
Total 19,959      
Accumulated Depreciation $ 558      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Land in Hudson, NY | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 775      
Initial Cost to Company        
Land 2,080      
Buildings 0      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,080      
Buildings 0      
Total 2,080      
Accumulated Depreciation 0      
Office facilities in Aurora, Eagan, and Virginia, MN | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 92,400      
Initial Cost to Company        
Land 13,546      
Buildings 110,173      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 993      
Gross Amount at which Carried at Close of Period        
Land 13,546      
Buildings 111,166      
Total 124,712      
Accumulated Depreciation 14,968      
Industrial facility in Chmielów, Poland | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 15,589      
Initial Cost to Company        
Land 1,323      
Buildings 5,245      
Cost Capitalized Subsequent to Acquisition 30,804      
Increase (Decrease) in Net Investments (3,837)      
Gross Amount at which Carried at Close of Period        
Land 1,794      
Buildings 31,741      
Total 33,535      
Accumulated Depreciation $ 1,809      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Office facility in St. Louis, MO | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 4,007      
Initial Cost to Company        
Land 954      
Buildings 4,665      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 954      
Buildings 4,665      
Total 5,619      
Accumulated Depreciation $ 448      
Life on which Depreciation in Latest Statement of Income is Computed 38 years      
Industrial facility in Avon, OH | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 3,570      
Initial Cost to Company        
Land 926      
Buildings 4,975      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 926      
Buildings 4,975      
Total 5,901      
Accumulated Depreciation $ 519      
Life on which Depreciation in Latest Statement of Income is Computed 35 years      
Industrial facility in Elk Grove Village, IL | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 9,062      
Initial Cost to Company        
Land 1,269      
Buildings 11,317      
Cost Capitalized Subsequent to Acquisition 59      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,269      
Buildings 11,376      
Total 12,645      
Accumulated Depreciation $ 1,799      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Learning centers in Montgomery, AL and Savannah, GA | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 15,950      
Initial Cost to Company        
Land 5,255      
Buildings 16,960      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 5,255      
Buildings 16,960      
Total 22,215      
Accumulated Depreciation $ 1,719      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Automotive dealerships in Huntsville, AL; Bentonville, AR; Bossier City, LA; Lee’s Summit, MO; Fayetteville, TN; and Fort Worth, TX | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company        
Land 17,283      
Buildings 32,225      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (15)      
Gross Amount at which Carried at Close of Period        
Land 17,269      
Buildings 32,224      
Total 49,493      
Accumulated Depreciation $ 4,751      
Life on which Depreciation in Latest Statement of Income is Computed 16 years      
Office facility in Warrenville, IL | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 18,956      
Initial Cost to Company        
Land 3,698      
Buildings 28,635      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,698      
Buildings 28,635      
Total 32,333      
Accumulated Depreciation $ 2,705      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Office and warehouse facilities in Zary, Poland | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 2,944      
Initial Cost to Company        
Land 356      
Buildings 1,168      
Cost Capitalized Subsequent to Acquisition 6,910      
Increase (Decrease) in Net Investments (1,394)      
Gross Amount at which Carried at Close of Period        
Land 297      
Buildings 6,743      
Total 7,040      
Accumulated Depreciation $ 477      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Industrial facility in Sterling, VA | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 14,070      
Initial Cost to Company        
Land 3,118      
Buildings 14,007      
Cost Capitalized Subsequent to Acquisition 5,071      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,118      
Buildings 19,078      
Total 22,196      
Accumulated Depreciation $ 1,819      
Life on which Depreciation in Latest Statement of Income is Computed 35 years      
Office facility in Houston, TX | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 128,200      
Initial Cost to Company        
Land 19,331      
Buildings 123,084      
Cost Capitalized Subsequent to Acquisition 4,520      
Increase (Decrease) in Net Investments 2,899      
Gross Amount at which Carried at Close of Period        
Land 19,331      
Buildings 130,503      
Total 149,834      
Accumulated Depreciation $ 13,645      
Life on which Depreciation in Latest Statement of Income is Computed 30 years      
Retail facility in Orlando, FL | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 56,733      
Initial Cost to Company        
Land 3,307      
Buildings 10,607      
Cost Capitalized Subsequent to Acquisition 103,914      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 26,000      
Buildings 91,828      
Total 117,828      
Accumulated Depreciation $ 1,658      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Office facility in Eagan, MN | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 9,428      
Initial Cost to Company        
Land 2,104      
Buildings 11,462      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (85)      
Gross Amount at which Carried at Close of Period        
Land 1,994      
Buildings 11,487      
Total 13,481      
Accumulated Depreciation $ 1,073      
Life on which Depreciation in Latest Statement of Income is Computed 35 years      
Warehouse facility in Saitama Prefecture, Japan | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 21,596      
Initial Cost to Company        
Land 17,292      
Buildings 28,575      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (14,565)      
Gross Amount at which Carried at Close of Period        
Land 11,801      
Buildings 19,501      
Total 31,302      
Accumulated Depreciation $ 2,383      
Life on which Depreciation in Latest Statement of Income is Computed 26 years      
Retail facilities in Bjelovar, Karlovac, Krapina, Metkovic, Novigrad, Porec, Umag, and Vodnjan, Croatia | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 20,060      
Initial Cost to Company        
Land 5,059      
Buildings 28,294      
Cost Capitalized Subsequent to Acquisition 6,634      
Increase (Decrease) in Net Investments (6,823)      
Gross Amount at which Carried at Close of Period        
Land 5,928      
Buildings 27,236      
Total 33,164      
Accumulated Depreciation 2,105      
Industrial facility in Portage, WI | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 4,738      
Initial Cost to Company        
Land 3,338      
Buildings 4,556      
Cost Capitalized Subsequent to Acquisition 502      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,338      
Buildings 5,058      
Total 8,396      
Accumulated Depreciation $ 552      
Life on which Depreciation in Latest Statement of Income is Computed 30 years      
Retail facility in Dallas, TX | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 10,013      
Initial Cost to Company        
Land 4,441      
Buildings 9,649      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 4,441      
Buildings 9,649      
Total 14,090      
Accumulated Depreciation $ 706      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Warehouse facility in Dillon, SC | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 26,000      
Initial Cost to Company        
Land 3,096      
Buildings 2,281      
Cost Capitalized Subsequent to Acquisition 37,989      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,096      
Buildings 40,270      
Total 43,366      
Accumulated Depreciation $ 1,593      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Land in Chicago, IL | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company        
Land 15,459      
Buildings 0      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 15,459      
Buildings 0      
Total 15,459      
Accumulated Depreciation 0      
Office facility in Northbrook, IL | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 5,645      
Initial Cost to Company        
Land 0      
Buildings 942      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 0      
Buildings 942      
Total 942      
Accumulated Depreciation $ 160      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Industrial facility in Wageningen, Netherlands | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 17,559      
Initial Cost to Company        
Land 4,790      
Buildings 24,301      
Cost Capitalized Subsequent to Acquisition 47      
Increase (Decrease) in Net Investments (4,868)      
Gross Amount at which Carried at Close of Period        
Land 4,028      
Buildings 20,242      
Total 24,270      
Accumulated Depreciation $ 1,286      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Warehouse facilities in Gadki, Poland | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 31,437      
Initial Cost to Company        
Land 9,219      
Buildings 48,578      
Cost Capitalized Subsequent to Acquisition 121      
Increase (Decrease) in Net Investments (9,613)      
Gross Amount at which Carried at Close of Period        
Land 7,688      
Buildings 40,617      
Total 48,305      
Accumulated Depreciation $ 2,754      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Automotive dealership in Lewisville, TX | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 9,450      
Initial Cost to Company        
Land 3,269      
Buildings 9,605      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,269      
Buildings 9,605      
Total 12,874      
Accumulated Depreciation $ 787      
Life on which Depreciation in Latest Statement of Income is Computed 39 years      
Office facility in Auburn Hills, MI | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 6,055      
Initial Cost to Company        
Land 789      
Buildings 7,163      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 789      
Buildings 7,163      
Total 7,952      
Accumulated Depreciation $ 428      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Office facility in Haibach, Germany | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 9,100      
Initial Cost to Company        
Land 2,544      
Buildings 11,114      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (2,652)      
Gross Amount at which Carried at Close of Period        
Land 2,050      
Buildings 8,956      
Total 11,006      
Accumulated Depreciation $ 743      
Life on which Depreciation in Latest Statement of Income is Computed 30 years      
Office facility in Houston, TX | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 31,200      
Initial Cost to Company        
Land 7,898      
Buildings 37,474      
Cost Capitalized Subsequent to Acquisition 750      
Increase (Decrease) in Net Investments 1,619      
Gross Amount at which Carried at Close of Period        
Land 7,898      
Buildings 39,843      
Total 47,741      
Accumulated Depreciation $ 2,888      
Life on which Depreciation in Latest Statement of Income is Computed 30 years      
Office facility in Tempe, AZ | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 14,800      
Initial Cost to Company        
Land 0      
Buildings 16,996      
Cost Capitalized Subsequent to Acquisition 4,272      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 0      
Buildings 21,268      
Total 21,268      
Accumulated Depreciation $ 1,147      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Office facility in Tucson, AZ | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 8,917      
Initial Cost to Company        
Land 2,440      
Buildings 11,175      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,440      
Buildings 11,175      
Total 13,615      
Accumulated Depreciation $ 659      
Life on which Depreciation in Latest Statement of Income is Computed 38 years      
Industrial facility in Drunen, Netherlands | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company        
Land 990      
Buildings 6,328      
Cost Capitalized Subsequent to Acquisition 6,700      
Increase (Decrease) in Net Investments 144      
Gross Amount at which Carried at Close of Period        
Land 961      
Buildings 13,201      
Total 14,162      
Accumulated Depreciation $ 241      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Industrial facility in New Concord, OH | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,680      
Initial Cost to Company        
Land 784      
Buildings 2,636      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 784      
Buildings 2,636      
Total 3,420      
Accumulated Depreciation 153      
Office facility in Krakow, Poland | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 5,529      
Initial Cost to Company        
Land 2,771      
Buildings 6,549      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (1,479)      
Gross Amount at which Carried at Close of Period        
Land 2,331      
Buildings 5,510      
Total 7,841      
Accumulated Depreciation $ 207      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Retail facility in Gelsenkirchen, Germany | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company        
Land 2,060      
Buildings 17,534      
Cost Capitalized Subsequent to Acquisition 123      
Increase (Decrease) in Net Investments (2,713)      
Gross Amount at which Carried at Close of Period        
Land 1,775      
Buildings 15,229      
Total 17,004      
Accumulated Depreciation $ 584      
Life on which Depreciation in Latest Statement of Income is Computed 35 years      
Office facility in Plymouth, Minnesota | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 22,250      
Initial Cost to Company        
Land 2,601      
Buildings 15,599      
Cost Capitalized Subsequent to Acquisition 3,256      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,601      
Buildings 18,855      
Total 21,456      
Accumulated Depreciation $ 561      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Office facility in San Antonio, TX | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 14,569      
Initial Cost to Company        
Land 3,131      
Buildings 13,124      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,131      
Buildings 13,124      
Total 16,255      
Accumulated Depreciation $ 372      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Warehouse facilities in Mszczonów and Tomaszów Mazowiecki, Poland | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 32,002      
Initial Cost to Company        
Land 10,108      
Buildings 35,856      
Cost Capitalized Subsequent to Acquisition 8      
Increase (Decrease) in Net Investments (1,772)      
Gross Amount at which Carried at Close of Period        
Land 9,716      
Buildings 34,484      
Total 44,200      
Accumulated Depreciation $ 969      
Life on which Depreciation in Latest Statement of Income is Computed 31 years      
Retail facilities in Joliet, IL; Fargo, ND; and Ashwaubenon, Brookfield, Greendale, and Wauwatosa, WI | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 42,284      
Initial Cost to Company        
Land 20,936      
Buildings 34,627      
Cost Capitalized Subsequent to Acquisition 98      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 20,936      
Buildings 34,725      
Total 55,661      
Accumulated Depreciation 759      
Warehouse facility in Sered, Slovakia | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 11,391      
Initial Cost to Company        
Land 4,059      
Buildings 15,297      
Cost Capitalized Subsequent to Acquisition 61      
Increase (Decrease) in Net Investments (202)      
Gross Amount at which Carried at Close of Period        
Land 4,017      
Buildings 15,198      
Total 19,215      
Accumulated Depreciation $ 233      
Life on which Depreciation in Latest Statement of Income is Computed 36 years      
Industrial facility in Tuchomerice, Czech Republic | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 17,466      
Initial Cost to Company        
Land 9,424      
Buildings 21,860      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 1      
Gross Amount at which Carried at Close of Period        
Land 9,424      
Buildings 21,861      
Total 31,285      
Accumulated Depreciation $ 37      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Office facility in Warsaw, Poland | Real Estate Subject To Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company        
Land 0      
Buildings 54,296      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 1      
Gross Amount at which Carried at Close of Period        
Land 0      
Buildings 54,297      
Total 54,297      
Accumulated Depreciation $ 80      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Industrial and office facilities in Nagold, Germany | Direct Financing Method        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial Cost to Company        
Land 6,012      
Buildings 41,493      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (28,529)      
Gross Amount at which Carried at Close of Period        
Total 18,976      
Industrial facilities in Mayodan, Sanford, and Stoneville, NC | Direct Financing Method        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial Cost to Company        
Land 3,100      
Buildings 35,766      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (2,070)      
Gross Amount at which Carried at Close of Period        
Total 36,796      
Industrial facility in Glendale Heights, IL | Direct Financing Method        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 17,527      
Initial Cost to Company        
Land 3,820      
Buildings 11,148      
Cost Capitalized Subsequent to Acquisition 18,245      
Increase (Decrease) in Net Investments 2,758      
Gross Amount at which Carried at Close of Period        
Total 35,971      
Office facility in New York City, NY | Direct Financing Method        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 107,483      
Initial Cost to Company        
Land 0      
Buildings 233,720      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 13,620      
Gross Amount at which Carried at Close of Period        
Total 247,340      
Industrial facilities in Colton, Fresno, Los Angeles, Orange, Pomona, and San Diego, CA; Holly Hill, FL; Rockmart, GA; Ooltewah, TN; and Dallas, TX | Direct Financing Method        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 9,488      
Initial Cost to Company        
Land 1,730      
Buildings 20,778      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (736)      
Gross Amount at which Carried at Close of Period        
Total 21,772      
Warehouse facilities in Bristol, Leeds, Liverpool, Luton, Newport, Plymouth, and Southampton, United Kingdom | Direct Financing Method        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 10,788      
Initial Cost to Company        
Land 508      
Buildings 24,009      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (2,202)      
Gross Amount at which Carried at Close of Period        
Total 22,315      
Retail facilities in Dugo Selo and Samobor, Croatia | Direct Financing Method        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 8,211      
Initial Cost to Company        
Land 1,804      
Buildings 11,618      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments (2,492)      
Gross Amount at which Carried at Close of Period        
Total 10,930      
Warehouse facility in Oxnard, CA | Direct Financing Method        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 5,766      
Initial Cost to Company        
Land 0      
Buildings 8,957      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 193      
Gross Amount at which Carried at Close of Period        
Total 9,150      
Industrial facilities in Bartow, FL; Momence, IL; Smithfield, NC; Hudson, NY; and Ardmore, OK | Direct Financing Method        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 21,888      
Initial Cost to Company        
Land 3,750      
Buildings 50,177      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 4,864      
Gross Amount at which Carried at Close of Period        
Total 58,791      
Industrial facility in Clarksville, TN | Direct Financing Method        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 4,373      
Initial Cost to Company        
Land 600      
Buildings 7,291      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 348      
Gross Amount at which Carried at Close of Period        
Total 8,239      
Industrial facility in Countryside, IL | Direct Financing Method        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 1,984      
Initial Cost to Company        
Land 425      
Buildings 1,800      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 39      
Gross Amount at which Carried at Close of Period        
Total 2,264      
Industrial facility in Bluffton, IN | Direct Financing Method        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 1,898      
Initial Cost to Company        
Land 264      
Buildings 3,407      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 20      
Gross Amount at which Carried at Close of Period        
Total 3,691      
Retail facilities in Joliet, Illinois and Greendale, Wisconsin | Direct Financing Method        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 14,886      
Initial Cost to Company        
Land 0      
Buildings 19,002      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 327      
Gross Amount at which Carried at Close of Period        
Total 19,329      
Fort Worth, TX | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 1,538      
Initial Cost to Company        
Land 610      
Buildings 2,672      
Cost Capitalized Subsequent to Acquisition 53      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 610      
Buildings 2,725      
Total 3,335      
Accumulated Depreciation $ 386      
Life on which Depreciation in Latest Statement of Income is Computed 33 years      
Anaheim, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,149      
Initial Cost to Company        
Land 1,040      
Buildings 1,166      
Cost Capitalized Subsequent to Acquisition 96      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,040      
Buildings 1,262      
Total 2,302      
Accumulated Depreciation $ 196      
Life on which Depreciation in Latest Statement of Income is Computed 33 years      
Apple Valley, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 2,300      
Initial Cost to Company        
Land 400      
Buildings 3,910      
Cost Capitalized Subsequent to Acquisition 155      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 400      
Buildings 4,065      
Total 4,465      
Accumulated Depreciation $ 531      
Life on which Depreciation in Latest Statement of Income is Computed 35 years      
Apple Valley, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,446      
Initial Cost to Company        
Land 230      
Buildings 2,196      
Cost Capitalized Subsequent to Acquisition 56      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 230      
Buildings 2,252      
Total 2,482      
Accumulated Depreciation $ 307      
Life on which Depreciation in Latest Statement of Income is Computed 33 years      
Bakersfield, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 849      
Initial Cost to Company        
Land 370      
Buildings 3,133      
Cost Capitalized Subsequent to Acquisition 355      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 370      
Buildings 3,488      
Total 3,858      
Accumulated Depreciation $ 535      
Life on which Depreciation in Latest Statement of Income is Computed 30 years      
Bakersfield, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 2,130      
Initial Cost to Company        
Land 690      
Buildings 3,238      
Cost Capitalized Subsequent to Acquisition 80      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 690      
Buildings 3,318      
Total 4,008      
Accumulated Depreciation $ 447      
Life on which Depreciation in Latest Statement of Income is Computed 34 years      
Bakersfield, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 2,013      
Initial Cost to Company        
Land 690      
Buildings 3,298      
Cost Capitalized Subsequent to Acquisition 64      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 690      
Buildings 3,362      
Total 4,052      
Accumulated Depreciation $ 444      
Life on which Depreciation in Latest Statement of Income is Computed 35 years      
Bakersfield, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,714      
Initial Cost to Company        
Land 480      
Buildings 3,297      
Cost Capitalized Subsequent to Acquisition 94      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 480      
Buildings 3,391      
Total 3,871      
Accumulated Depreciation $ 586      
Life on which Depreciation in Latest Statement of Income is Computed 35 years      
Fresno, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 2,638      
Initial Cost to Company        
Land 601      
Buildings 7,300      
Cost Capitalized Subsequent to Acquisition 227      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 601      
Buildings 7,527      
Total 8,128      
Accumulated Depreciation $ 1,610      
Life on which Depreciation in Latest Statement of Income is Computed 30 years      
Grand Terrace, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 728      
Initial Cost to Company        
Land 950      
Buildings 1,903      
Cost Capitalized Subsequent to Acquisition 110      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 950      
Buildings 2,013      
Total 2,963      
Accumulated Depreciation $ 354      
Life on which Depreciation in Latest Statement of Income is Computed 25 years      
Harbor City, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,293      
Initial Cost to Company        
Land 1,487      
Buildings 810      
Cost Capitalized Subsequent to Acquisition 107      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,487      
Buildings 917      
Total 2,404      
Accumulated Depreciation $ 152      
Life on which Depreciation in Latest Statement of Income is Computed 30 years      
San Diego, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 6,273      
Initial Cost to Company        
Land 7,951      
Buildings 3,926      
Cost Capitalized Subsequent to Acquisition 248      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 7,951      
Buildings 4,174      
Total 12,125      
Accumulated Depreciation $ 642      
Life on which Depreciation in Latest Statement of Income is Computed 30 years      
Palm Springs, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 2,511      
Initial Cost to Company        
Land 1,287      
Buildings 3,124      
Cost Capitalized Subsequent to Acquisition 65      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,287      
Buildings 3,189      
Total 4,476      
Accumulated Depreciation $ 489      
Life on which Depreciation in Latest Statement of Income is Computed 30 years      
Palmdale, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 2,773      
Initial Cost to Company        
Land 940      
Buildings 4,263      
Cost Capitalized Subsequent to Acquisition 269      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 940      
Buildings 4,532      
Total 5,472      
Accumulated Depreciation $ 640      
Life on which Depreciation in Latest Statement of Income is Computed 32 years      
Palmdale, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 2,081      
Initial Cost to Company        
Land 1,220      
Buildings 2,954      
Cost Capitalized Subsequent to Acquisition 100      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,220      
Buildings 3,054      
Total 4,274      
Accumulated Depreciation $ 421      
Life on which Depreciation in Latest Statement of Income is Computed 33 years      
Riverside, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,124      
Initial Cost to Company        
Land 560      
Buildings 1,492      
Cost Capitalized Subsequent to Acquisition 93      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 560      
Buildings 1,585      
Total 2,145      
Accumulated Depreciation $ 234      
Life on which Depreciation in Latest Statement of Income is Computed 30 years      
Rosamond, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,700      
Initial Cost to Company        
Land 460      
Buildings 3,220      
Cost Capitalized Subsequent to Acquisition 54      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 460      
Buildings 3,274      
Total 3,734      
Accumulated Depreciation $ 449      
Life on which Depreciation in Latest Statement of Income is Computed 33 years      
Rubidoux, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,247      
Initial Cost to Company        
Land 514      
Buildings 1,653      
Cost Capitalized Subsequent to Acquisition 93      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 514      
Buildings 1,746      
Total 2,260      
Accumulated Depreciation $ 234      
Life on which Depreciation in Latest Statement of Income is Computed 33 years      
South Gate, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,774      
Initial Cost to Company        
Land 1,597      
Buildings 2,067      
Cost Capitalized Subsequent to Acquisition 102      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,597      
Buildings 2,169      
Total 3,766      
Accumulated Depreciation $ 337      
Life on which Depreciation in Latest Statement of Income is Computed 30 years      
Kailua-Kona, HI | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 832      
Initial Cost to Company        
Land 1,000      
Buildings 1,108      
Cost Capitalized Subsequent to Acquisition 59      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,000      
Buildings 1,167      
Total 2,167      
Accumulated Depreciation $ 207      
Life on which Depreciation in Latest Statement of Income is Computed 30 years      
Chicago, IL | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 2,342      
Initial Cost to Company        
Land 600      
Buildings 4,124      
Cost Capitalized Subsequent to Acquisition 198      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 600      
Buildings 4,322      
Total 4,922      
Accumulated Depreciation $ 588      
Life on which Depreciation in Latest Statement of Income is Computed 25 years      
Chicago, IL | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,322      
Initial Cost to Company        
Land 400      
Buildings 2,074      
Cost Capitalized Subsequent to Acquisition 212      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 400      
Buildings 2,286      
Total 2,686      
Accumulated Depreciation $ 317      
Life on which Depreciation in Latest Statement of Income is Computed 30 years      
Rockford, IL | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,363      
Initial Cost to Company        
Land 548      
Buildings 1,881      
Cost Capitalized Subsequent to Acquisition 5      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 548      
Buildings 1,886      
Total 2,434      
Accumulated Depreciation $ 345      
Life on which Depreciation in Latest Statement of Income is Computed 25 years      
Rockford, IL | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 250      
Initial Cost to Company        
Land 114      
Buildings 633      
Cost Capitalized Subsequent to Acquisition 9      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 114      
Buildings 642      
Total 756      
Accumulated Depreciation $ 116      
Life on which Depreciation in Latest Statement of Income is Computed 25 years      
Rockford, IL | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,319      
Initial Cost to Company        
Land 380      
Buildings 2,321      
Cost Capitalized Subsequent to Acquisition 19      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 380      
Buildings 2,340      
Total 2,720      
Accumulated Depreciation $ 422      
Life on which Depreciation in Latest Statement of Income is Computed 25 years      
Kihei, HI | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 5,372      
Initial Cost to Company        
Land 2,523      
Buildings 7,481      
Cost Capitalized Subsequent to Acquisition 631      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,523      
Buildings 8,112      
Total 10,635      
Accumulated Depreciation $ 889      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Bakersfield, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,875      
Initial Cost to Company        
Land 1,060      
Buildings 3,138      
Cost Capitalized Subsequent to Acquisition 73      
Increase (Decrease) in Net Investments (464)      
Gross Amount at which Carried at Close of Period        
Land 1,060      
Buildings 2,747      
Total 3,807      
Accumulated Depreciation $ 478      
Life on which Depreciation in Latest Statement of Income is Computed 25 years      
Bakersfield, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,999      
Initial Cost to Company        
Land 767      
Buildings 2,230      
Cost Capitalized Subsequent to Acquisition 83      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 767      
Buildings 2,313      
Total 3,080      
Accumulated Depreciation $ 408      
Life on which Depreciation in Latest Statement of Income is Computed 25 years      
National City, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 2,517      
Initial Cost to Company        
Land 3,158      
Buildings 1,483      
Cost Capitalized Subsequent to Acquisition 86      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 3,158      
Buildings 1,569      
Total 4,727      
Accumulated Depreciation $ 247      
Life on which Depreciation in Latest Statement of Income is Computed 28 years      
Mundelein, IL | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 3,553      
Initial Cost to Company        
Land 1,080      
Buildings 5,287      
Cost Capitalized Subsequent to Acquisition 217      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,080      
Buildings 5,504      
Total 6,584      
Accumulated Depreciation $ 959      
Life on which Depreciation in Latest Statement of Income is Computed 25 years      
Pearl City, HI | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 3,450      
Initial Cost to Company        
Land 0      
Buildings 5,141      
Cost Capitalized Subsequent to Acquisition 502      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 0      
Buildings 5,643      
Total 5,643      
Accumulated Depreciation $ 1,188      
Life on which Depreciation in Latest Statement of Income is Computed 20 years      
Palm Springs, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 2,000      
Initial Cost to Company        
Land 1,019      
Buildings 2,131      
Cost Capitalized Subsequent to Acquisition 257      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,019      
Buildings 2,388      
Total 3,407      
Accumulated Depreciation $ 364      
Life on which Depreciation in Latest Statement of Income is Computed 28 years      
Loves Park, IL | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,214      
Initial Cost to Company        
Land 394      
Buildings 3,390      
Cost Capitalized Subsequent to Acquisition 38      
Increase (Decrease) in Net Investments (139)      
Gross Amount at which Carried at Close of Period        
Land 394      
Buildings 3,289      
Total 3,683      
Accumulated Depreciation $ 712      
Life on which Depreciation in Latest Statement of Income is Computed 20 years      
Mundelein, IL | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 747      
Initial Cost to Company        
Land 535      
Buildings 1,757      
Cost Capitalized Subsequent to Acquisition 44      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 535      
Buildings 1,801      
Total 2,336      
Accumulated Depreciation $ 393      
Life on which Depreciation in Latest Statement of Income is Computed 20 years      
Chicago, IL | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 3,158      
Initial Cost to Company        
Land 1,049      
Buildings 5,672      
Cost Capitalized Subsequent to Acquisition 183      
Increase (Decrease) in Net Investments (3)      
Gross Amount at which Carried at Close of Period        
Land 1,049      
Buildings 5,852      
Total 6,901      
Accumulated Depreciation $ 825      
Life on which Depreciation in Latest Statement of Income is Computed 30 years      
Bakersfield, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 2,500      
Initial Cost to Company        
Land 1,068      
Buildings 2,115      
Cost Capitalized Subsequent to Acquisition 93      
Increase (Decrease) in Net Investments 464      
Gross Amount at which Carried at Close of Period        
Land 1,068      
Buildings 2,672      
Total 3,740      
Accumulated Depreciation $ 392      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Beaumont, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 2,610      
Initial Cost to Company        
Land 1,616      
Buildings 2,873      
Cost Capitalized Subsequent to Acquisition 82      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,616      
Buildings 2,955      
Total 4,571      
Accumulated Depreciation $ 388      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Victorville, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,200      
Initial Cost to Company        
Land 299      
Buildings 1,766      
Cost Capitalized Subsequent to Acquisition 36      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 299      
Buildings 1,802      
Total 2,101      
Accumulated Depreciation $ 250      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Victorville, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,021      
Initial Cost to Company        
Land 190      
Buildings 1,756      
Cost Capitalized Subsequent to Acquisition 82      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 190      
Buildings 1,838      
Total 2,028      
Accumulated Depreciation $ 241      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
San Bernardino, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,000      
Initial Cost to Company        
Land 698      
Buildings 1,397      
Cost Capitalized Subsequent to Acquisition 90      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 698      
Buildings 1,487      
Total 2,185      
Accumulated Depreciation $ 182      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Peoria, IL | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 2,230      
Initial Cost to Company        
Land 549      
Buildings 2,424      
Cost Capitalized Subsequent to Acquisition 32      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 549      
Buildings 2,456      
Total 3,005      
Accumulated Depreciation $ 421      
Life on which Depreciation in Latest Statement of Income is Computed 35 years      
East Peoria, IL | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,775      
Initial Cost to Company        
Land 409      
Buildings 1,816      
Cost Capitalized Subsequent to Acquisition 45      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 409      
Buildings 1,861      
Total 2,270      
Accumulated Depreciation $ 297      
Life on which Depreciation in Latest Statement of Income is Computed 35 years      
Loves Park, IL | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,000      
Initial Cost to Company        
Land 439      
Buildings 998      
Cost Capitalized Subsequent to Acquisition 159      
Increase (Decrease) in Net Investments 139      
Gross Amount at which Carried at Close of Period        
Land 439      
Buildings 1,296      
Total 1,735      
Accumulated Depreciation $ 197      
Life on which Depreciation in Latest Statement of Income is Computed 35 years      
Hesperia, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 888      
Initial Cost to Company        
Land 648      
Buildings 1,377      
Cost Capitalized Subsequent to Acquisition 79      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 648      
Buildings 1,456      
Total 2,104      
Accumulated Depreciation $ 199      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Mobile, AL | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,966      
Initial Cost to Company        
Land 1,078      
Buildings 3,799      
Cost Capitalized Subsequent to Acquisition 13      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,078      
Buildings 3,812      
Total 4,890      
Accumulated Depreciation $ 1,371      
Life on which Depreciation in Latest Statement of Income is Computed 12 years      
Slidell, LA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 2,389      
Initial Cost to Company        
Land 620      
Buildings 3,434      
Cost Capitalized Subsequent to Acquisition 32      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 620      
Buildings 3,466      
Total 4,086      
Accumulated Depreciation $ 571      
Life on which Depreciation in Latest Statement of Income is Computed 32 years      
Baton Rouge, LA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 796      
Initial Cost to Company        
Land 401      
Buildings 955      
Cost Capitalized Subsequent to Acquisition 15      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 401      
Buildings 970      
Total 1,371      
Accumulated Depreciation $ 265      
Life on which Depreciation in Latest Statement of Income is Computed 18 years      
Baton Rouge, LA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 2,115      
Initial Cost to Company        
Land 820      
Buildings 3,222      
Cost Capitalized Subsequent to Acquisition 94      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 820      
Buildings 3,316      
Total 4,136      
Accumulated Depreciation $ 681      
Life on which Depreciation in Latest Statement of Income is Computed 25 years      
Gulfport, MS | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,194      
Initial Cost to Company        
Land 591      
Buildings 2,539      
Cost Capitalized Subsequent to Acquisition 77      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 591      
Buildings 2,616      
Total 3,207      
Accumulated Depreciation $ 827      
Life on which Depreciation in Latest Statement of Income is Computed 15 years      
Cherry Valley, IL | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,775      
Initial Cost to Company        
Land 1,076      
Buildings 1,763      
Cost Capitalized Subsequent to Acquisition 13      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,076      
Buildings 1,776      
Total 2,852      
Accumulated Depreciation $ 421      
Life on which Depreciation in Latest Statement of Income is Computed 20 years      
Fayetteville, NC | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 3,120      
Initial Cost to Company        
Land 1,677      
Buildings 3,116      
Cost Capitalized Subsequent to Acquisition 30      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,677      
Buildings 3,146      
Total 4,823      
Accumulated Depreciation $ 452      
Life on which Depreciation in Latest Statement of Income is Computed 34 years      
Tampa, FL | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 3,800      
Initial Cost to Company        
Land 599      
Buildings 6,273      
Cost Capitalized Subsequent to Acquisition 66      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 599      
Buildings 6,339      
Total 6,938      
Accumulated Depreciation $ 503      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
St. Petersburg, FL | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 4,100      
Initial Cost to Company        
Land 2,253      
Buildings 3,512      
Cost Capitalized Subsequent to Acquisition 303      
Increase (Decrease) in Net Investments (1)      
Gross Amount at which Carried at Close of Period        
Land 2,253      
Buildings 3,814      
Total 6,067      
Accumulated Depreciation $ 309      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Palm Harbor, FL | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 7,100      
Initial Cost to Company        
Land 2,192      
Buildings 7,237      
Cost Capitalized Subsequent to Acquisition 141      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,192      
Buildings 7,378      
Total 9,570      
Accumulated Depreciation $ 631      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Midland, TX | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 4,300      
Initial Cost to Company        
Land 1,026      
Buildings 5,546      
Cost Capitalized Subsequent to Acquisition 2      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,026      
Buildings 5,548      
Total 6,574      
Accumulated Depreciation $ 583      
Life on which Depreciation in Latest Statement of Income is Computed 20 years      
Midland, TX | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 5,830      
Initial Cost to Company        
Land 2,136      
Buildings 6,665      
Cost Capitalized Subsequent to Acquisition 6      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 2,136      
Buildings 6,671      
Total 8,807      
Accumulated Depreciation $ 675      
Life on which Depreciation in Latest Statement of Income is Computed 20 years      
Odessa, TX | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 3,970      
Initial Cost to Company        
Land 975      
Buildings 4,924      
Cost Capitalized Subsequent to Acquisition 7      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 975      
Buildings 4,931      
Total 5,906      
Accumulated Depreciation $ 516      
Life on which Depreciation in Latest Statement of Income is Computed 20 years      
Odessa, TX | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 5,400      
Initial Cost to Company        
Land 1,099      
Buildings 6,510      
Cost Capitalized Subsequent to Acquisition 5      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,099      
Buildings 6,515      
Total 7,614      
Accumulated Depreciation $ 692      
Life on which Depreciation in Latest Statement of Income is Computed 20 years      
Cathedral City, CA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,399      
Initial Cost to Company        
Land 0      
Buildings 2,275      
Cost Capitalized Subsequent to Acquisition 2      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 0      
Buildings 2,277      
Total 2,277      
Accumulated Depreciation $ 242      
Life on which Depreciation in Latest Statement of Income is Computed 34 years      
Hilo, HI | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 3,965      
Initial Cost to Company        
Land 296      
Buildings 4,996      
Cost Capitalized Subsequent to Acquisition 0      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 296      
Buildings 4,996      
Total 5,292      
Accumulated Depreciation $ 324      
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Clearwater, FL | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 2,880      
Initial Cost to Company        
Land 924      
Buildings 2,966      
Cost Capitalized Subsequent to Acquisition 32      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 924      
Buildings 2,998      
Total 3,922      
Accumulated Depreciation $ 242      
Life on which Depreciation in Latest Statement of Income is Computed 32 years      
Winder, GA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 415      
Initial Cost to Company        
Land 546      
Buildings 30      
Cost Capitalized Subsequent to Acquisition 7      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 546      
Buildings 37      
Total 583      
Accumulated Depreciation $ 5      
Life on which Depreciation in Latest Statement of Income is Computed 31 years      
Winder, GA | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,427      
Initial Cost to Company        
Land 495      
Buildings 1,253      
Cost Capitalized Subsequent to Acquisition 48      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 495      
Buildings 1,301      
Total 1,796      
Accumulated Depreciation $ 170      
Life on which Depreciation in Latest Statement of Income is Computed 25 years      
Orlando, FL | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 4,160      
Initial Cost to Company        
Land 1,064      
Buildings 4,889      
Cost Capitalized Subsequent to Acquisition 46      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,064      
Buildings 4,935      
Total 5,999      
Accumulated Depreciation $ 365      
Life on which Depreciation in Latest Statement of Income is Computed 35 years      
Palm Coast, FL | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 3,420      
Initial Cost to Company        
Land 1,749      
Buildings 3,285      
Cost Capitalized Subsequent to Acquisition 30      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,749      
Buildings 3,315      
Total 5,064      
Accumulated Depreciation $ 320      
Life on which Depreciation in Latest Statement of Income is Computed 29 years      
Holiday, FL | Operating Real Estate – Self-Storage Facilities        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 2,250      
Initial Cost to Company        
Land 1,829      
Buildings 1,097      
Cost Capitalized Subsequent to Acquisition 474      
Increase (Decrease) in Net Investments 0      
Gross Amount at which Carried at Close of Period        
Land 1,829      
Buildings 1,571      
Total 3,400      
Accumulated Depreciation $ 124      
Life on which Depreciation in Latest Statement of Income is Computed 23 years      
Minimum | Industrial facilities in Sergeant Bluff, IA; Bossier City, LA; and Alvarado, TX | Real Estate Subject To Operating Lease        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of Income is Computed 25 years      
Minimum | Industrial facilities in Phoenix, AZ; Colton, Fresno, Los Angeles, Orange, Pomona, and San Diego, CA; Safety Harbor, FL; Durham, NC; and Columbia, SC | Real Estate Subject To Operating Lease        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of Income is Computed 27 years      
Minimum | Warehouse facilities in Oxnard and Watsonville, CA | Real Estate Subject To Operating Lease        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of Income is Computed 10 years      
Minimum | Retail facilities located throughout Italy | Real Estate Subject To Operating Lease        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of Income is Computed 29 years      
Minimum | Office facilities in Aurora, Eagan, and Virginia, MN | Real Estate Subject To Operating Lease        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of Income is Computed 32 years      
Minimum | Retail facilities in Bjelovar, Karlovac, Krapina, Metkovic, Novigrad, Porec, Umag, and Vodnjan, Croatia | Real Estate Subject To Operating Lease        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of Income is Computed 32 years      
Minimum | Industrial facility in New Concord, OH | Real Estate Subject To Operating Lease        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of Income is Computed 35 years      
Minimum | Retail facilities in Joliet, IL; Fargo, ND; and Ashwaubenon, Brookfield, Greendale, and Wauwatosa, WI | Real Estate Subject To Operating Lease        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of Income is Computed 27 years      
Maximum        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of Income is Computed 29 years      
Maximum | Industrial facilities in Sergeant Bluff, IA; Bossier City, LA; and Alvarado, TX | Real Estate Subject To Operating Lease        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Maximum | Industrial facilities in Phoenix, AZ; Colton, Fresno, Los Angeles, Orange, Pomona, and San Diego, CA; Safety Harbor, FL; Durham, NC; and Columbia, SC | Real Estate Subject To Operating Lease        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Maximum | Warehouse facilities in Oxnard and Watsonville, CA | Real Estate Subject To Operating Lease        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Maximum | Retail facilities located throughout Italy | Real Estate Subject To Operating Lease        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Maximum | Office facilities in Aurora, Eagan, and Virginia, MN | Real Estate Subject To Operating Lease        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Maximum | Retail facilities in Bjelovar, Karlovac, Krapina, Metkovic, Novigrad, Porec, Umag, and Vodnjan, Croatia | Real Estate Subject To Operating Lease        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of Income is Computed 40 years      
Maximum | Industrial facility in New Concord, OH | Real Estate Subject To Operating Lease        
Gross Amount at which Carried at Close of Period        
Life on which Depreciation in Latest Statement of Income is Computed 40 years