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Schedule III - Real Estate and Accumulated Depreciation - Triple-net (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances $ 2,129,954      
Initial cost of land and land improvements 3,760,148      
Initial cost of building and improvements 30,524,134      
Cost Capitalized Subsequent to Acquisition 6,781,997      
Carrying amount of land and land improvements 4,249,834      
Carrying amount of building and improvements 36,750,932      
Accumulated depreciation 8,075,733 $ 6,910,114 $ 6,104,297 $ 5,715,459
Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 39,179      
Initial cost of land and land improvements 873,139      
Initial cost of building and improvements 6,845,480      
Cost Capitalized Subsequent to Acquisition 586,644      
Carrying amount of land and land improvements 910,570      
Carrying amount of building and improvements 7,394,693      
Accumulated depreciation 1,549,022      
Abilene, TX 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 950      
Initial cost of building and improvements 20,987      
Cost Capitalized Subsequent to Acquisition 11,660      
Carrying amount of land and land improvements 950      
Carrying amount of building and improvements 32,647      
Accumulated depreciation 6,015      
Abilene, TX 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 990      
Initial cost of building and improvements 8,187      
Cost Capitalized Subsequent to Acquisition 1,089      
Carrying amount of land and land improvements 990      
Carrying amount of building and improvements 9,276      
Accumulated depreciation 2,046      
Agawam, MA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 880      
Initial cost of building and improvements 13,130      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 880      
Carrying amount of building and improvements 13,130      
Accumulated depreciation 9,343      
Akron, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 633      
Initial cost of building and improvements 3,002      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 633      
Carrying amount of building and improvements 3,002      
Accumulated depreciation 376      
Alexandria, VA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,452      
Initial cost of building and improvements 6,826      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,452      
Carrying amount of building and improvements 6,826      
Accumulated depreciation 825      
Alhambra, CA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 600      
Initial cost of building and improvements 6,305      
Cost Capitalized Subsequent to Acquisition 8,867      
Carrying amount of land and land improvements 600      
Carrying amount of building and improvements 15,172      
Accumulated depreciation 3,612      
Allen Park, MI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,767      
Initial cost of building and improvements 5,025      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,767      
Carrying amount of building and improvements 5,025      
Accumulated depreciation 614      
Allentown, PA 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 494      
Initial cost of building and improvements 11,845      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 494      
Carrying amount of building and improvements 11,845      
Accumulated depreciation 1,413      
Allentown, PA 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,491      
Initial cost of building and improvements 4,822      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,491      
Carrying amount of building and improvements 4,822      
Accumulated depreciation 604      
Alma, MI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,267      
Initial cost of building and improvements 6,543      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,267      
Carrying amount of building and improvements 6,543      
Accumulated depreciation 606      
Amarillo, TX | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,273      
Initial cost of building and improvements 11,791      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,273      
Carrying amount of building and improvements 11,791      
Accumulated depreciation 213      
Ames, IA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 330      
Initial cost of building and improvements 8,870      
Cost Capitalized Subsequent to Acquisition 1,799      
Carrying amount of land and land improvements 330      
Carrying amount of building and improvements 10,669      
Accumulated depreciation 3,031      
Ann Arbor, MI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,172      
Initial cost of building and improvements 11,123      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,172      
Carrying amount of building and improvements 11,123      
Accumulated depreciation 1,432      
Annandale, VA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,687      
Initial cost of building and improvements 18,974      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,687      
Carrying amount of building and improvements 18,974      
Accumulated depreciation 2,214      
Arlington, VA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 4,016      
Initial cost of building and improvements 8,801      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 4,016      
Carrying amount of building and improvements 8,801      
Accumulated depreciation 1,048      
Asheboro, NC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 290      
Initial cost of building and improvements 5,032      
Cost Capitalized Subsequent to Acquisition 428      
Carrying amount of land and land improvements 290      
Carrying amount of building and improvements 5,460      
Accumulated depreciation 2,634      
Asheville, NC 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 204      
Initial cost of building and improvements 3,489      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 204      
Carrying amount of building and improvements 3,489      
Accumulated depreciation 2,179      
Asheville, NC 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 280      
Initial cost of building and improvements 1,955      
Cost Capitalized Subsequent to Acquisition 796      
Carrying amount of land and land improvements 280      
Carrying amount of building and improvements 2,751      
Accumulated depreciation 1,240      
Atchison, KS | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 140      
Initial cost of building and improvements 5,610      
Cost Capitalized Subsequent to Acquisition 24      
Carrying amount of land and land improvements 140      
Carrying amount of building and improvements 5,634      
Accumulated depreciation 1,111      
Austin, TX | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,691      
Initial cost of building and improvements 5,005      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,691      
Carrying amount of building and improvements 5,005      
Accumulated depreciation 795      
Avon, IN 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,830      
Initial cost of building and improvements 14,470      
Cost Capitalized Subsequent to Acquisition 2,718      
Carrying amount of land and land improvements 1,830      
Carrying amount of building and improvements 17,188      
Accumulated depreciation 5,181      
Avon, IN 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 900      
Initial cost of building and improvements 19,444      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 900      
Carrying amount of building and improvements 19,444      
Accumulated depreciation 4,601      
Avon, CT | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,132      
Initial cost of building and improvements 7,624      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,132      
Carrying amount of building and improvements 7,624      
Accumulated depreciation 1,111      
Azusa, CA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 570      
Initial cost of building and improvements 3,141      
Cost Capitalized Subsequent to Acquisition 7,520      
Carrying amount of land and land improvements 570      
Carrying amount of building and improvements 10,661      
Accumulated depreciation 4,478      
Bad Axe, MI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,317      
Initial cost of building and improvements 5,972      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,317      
Carrying amount of building and improvements 5,972      
Accumulated depreciation 620      
Baldwin City, KS | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 190      
Initial cost of building and improvements 4,810      
Cost Capitalized Subsequent to Acquisition 58      
Carrying amount of land and land improvements 190      
Carrying amount of building and improvements 4,868      
Accumulated depreciation 985      
Baltimore, MD 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 4,306      
Initial cost of building and improvements 4,303      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 4,306      
Carrying amount of building and improvements 4,303      
Accumulated depreciation 561      
Baltimore, MD 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,069      
Initial cost of building and improvements 3,148      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 3,069      
Carrying amount of building and improvements 3,148      
Accumulated depreciation 436      
Barberton, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,307      
Initial cost of building and improvements 9,310      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,307      
Carrying amount of building and improvements 9,310      
Accumulated depreciation 1,102      
Bartlesville, OK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 100      
Initial cost of building and improvements 1,380      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 100      
Carrying amount of building and improvements 1,380      
Accumulated depreciation 957      
Bay City, MI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 633      
Initial cost of building and improvements 2,619      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 633      
Carrying amount of building and improvements 2,619      
Accumulated depreciation 354      
Bedford, PA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 637      
Initial cost of building and improvements 4,432      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 637      
Carrying amount of building and improvements 4,432      
Accumulated depreciation 621      
Belmont, CA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,000      
Initial cost of building and improvements 23,526      
Cost Capitalized Subsequent to Acquisition 1,765      
Carrying amount of land and land improvements 3,000      
Carrying amount of building and improvements 25,291      
Accumulated depreciation 9,273      
Belvidere, NJ | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,001      
Initial cost of building and improvements 26,191      
Cost Capitalized Subsequent to Acquisition 97      
Carrying amount of land and land improvements 2,001      
Carrying amount of building and improvements 26,288      
Accumulated depreciation 3,303      
Benbrook, TX | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,550      
Initial cost of building and improvements 13,553      
Cost Capitalized Subsequent to Acquisition 2,747      
Carrying amount of land and land improvements 1,550      
Carrying amount of building and improvements 16,300      
Accumulated depreciation 4,519      
Berkeley, CA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 11,142      
Initial cost of land and land improvements 3,050      
Initial cost of building and improvements 32,677      
Cost Capitalized Subsequent to Acquisition 5,047      
Carrying amount of land and land improvements 3,050      
Carrying amount of building and improvements 37,724      
Accumulated depreciation 9,221      
Bethel Park, PA 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,700      
Initial cost of building and improvements 16,007      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,700      
Carrying amount of building and improvements 16,007      
Accumulated depreciation 5,931      
Bethel Park, PA 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,008      
Initial cost of building and improvements 6,740      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,008      
Carrying amount of building and improvements 6,740      
Accumulated depreciation 854      
Bethesda, MD | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,218      
Initial cost of building and improvements 6,869      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,218      
Carrying amount of building and improvements 6,869      
Accumulated depreciation 802      
Bethlehem, PA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,191      
Initial cost of building and improvements 16,887      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,191      
Carrying amount of building and improvements 16,887      
Accumulated depreciation 1,918      
Beverly, MA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 5,879      
Initial cost of building and improvements 10,378      
Cost Capitalized Subsequent to Acquisition 65      
Carrying amount of land and land improvements 5,879      
Carrying amount of building and improvements 10,443      
Accumulated depreciation 391      
Beverly Hills, CA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 6,000      
Initial cost of building and improvements 13,385      
Cost Capitalized Subsequent to Acquisition 203      
Carrying amount of land and land improvements 6,000      
Carrying amount of building and improvements 13,588      
Accumulated depreciation 2,783      
Bexleyheath, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,671      
Initial cost of building and improvements 10,579      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 3,671      
Carrying amount of building and improvements 10,579      
Accumulated depreciation 2,269      
Bingham Farms, MI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 781      
Initial cost of building and improvements 15,671      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 781      
Carrying amount of building and improvements 15,671      
Accumulated depreciation 1,845      
Birmingham, UK 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 0      
Initial cost of building and improvements 0      
Cost Capitalized Subsequent to Acquisition 20,248      
Carrying amount of land and land improvements 1,558      
Carrying amount of building and improvements 18,690      
Accumulated depreciation 3,694      
Birmingham, UK 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 0      
Initial cost of building and improvements 0      
Cost Capitalized Subsequent to Acquisition 11,031      
Carrying amount of land and land improvements 1,159      
Carrying amount of building and improvements 9,872      
Accumulated depreciation 1,966      
Birmingham, UK 3 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 0      
Initial cost of building and improvements 0      
Cost Capitalized Subsequent to Acquisition 16,152      
Carrying amount of land and land improvements 1,612      
Carrying amount of building and improvements 14,540      
Accumulated depreciation 2,916      
Birmingham, UK 4 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 0      
Initial cost of building and improvements 0      
Cost Capitalized Subsequent to Acquisition 10,296      
Carrying amount of land and land improvements 1,431      
Carrying amount of building and improvements 8,865      
Accumulated depreciation 1,805      
Bloomington, IN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 670      
Initial cost of building and improvements 17,423      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 670      
Carrying amount of building and improvements 17,423      
Accumulated depreciation 3,632      
Boca Raton, FL 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,200      
Initial cost of building and improvements 4,974      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,200      
Carrying amount of building and improvements 4,974      
Accumulated depreciation 763      
Boca Raton, FL 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,826      
Initial cost of building and improvements 4,061      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,826      
Carrying amount of building and improvements 4,061      
Accumulated depreciation 557      
Bossier City, LA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,009      
Initial cost of building and improvements 31,198      
Cost Capitalized Subsequent to Acquisition 40      
Carrying amount of land and land improvements 2,009      
Carrying amount of building and improvements 31,238      
Accumulated depreciation 1,061      
Boulder, CO | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,601      
Initial cost of building and improvements 21,364      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 3,601      
Carrying amount of building and improvements 21,364      
Accumulated depreciation 2,691      
Bournemouth, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,358      
Initial cost of building and improvements 16,347      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,358      
Carrying amount of building and improvements 16,347      
Accumulated depreciation 1,587      
Boynton Beach, FL 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,138      
Initial cost of building and improvements 10,201      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,138      
Carrying amount of building and improvements 10,201      
Accumulated depreciation 1,314      
Boynton Beach, FL 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,804      
Initial cost of building and improvements 14,222      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,804      
Carrying amount of building and improvements 14,222      
Accumulated depreciation 1,674      
Bracknell, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,865      
Initial cost of building and improvements 10,487      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 3,865      
Carrying amount of building and improvements 10,487      
Accumulated depreciation 1,483      
Bradenton, FL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 252      
Initial cost of building and improvements 3,298      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 252      
Carrying amount of building and improvements 3,298      
Accumulated depreciation 2,298      
Braintree, MA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 170      
Initial cost of building and improvements 7,157      
Cost Capitalized Subsequent to Acquisition 1,290      
Carrying amount of land and land improvements 170      
Carrying amount of building and improvements 8,447      
Accumulated depreciation 8,447      
Braintree, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 0      
Initial cost of building and improvements 13,016      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 0      
Carrying amount of building and improvements 13,016      
Accumulated depreciation 2,859      
Brecksville, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 990      
Initial cost of building and improvements 19,353      
Cost Capitalized Subsequent to Acquisition 598      
Carrying amount of land and land improvements 990      
Carrying amount of building and improvements 19,951      
Accumulated depreciation 4,479      
Brick, NJ | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,290      
Initial cost of building and improvements 25,247      
Cost Capitalized Subsequent to Acquisition 1,428      
Carrying amount of land and land improvements 1,290      
Carrying amount of building and improvements 26,675      
Accumulated depreciation 8,182      
Bridgewater, NJ | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,800      
Initial cost of building and improvements 31,810      
Cost Capitalized Subsequent to Acquisition 1,758      
Carrying amount of land and land improvements 1,800      
Carrying amount of building and improvements 33,568      
Accumulated depreciation 10,292      
Bristol, UK 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 0      
Initial cost of building and improvements 0      
Cost Capitalized Subsequent to Acquisition 20,221      
Carrying amount of land and land improvements 3,873      
Carrying amount of building and improvements 16,348      
Accumulated depreciation 3,055      
Bristol, UK 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 0      
Initial cost of building and improvements 0      
Cost Capitalized Subsequent to Acquisition 13,926      
Carrying amount of land and land improvements 2,066      
Carrying amount of building and improvements 11,860      
Accumulated depreciation 1,363      
Brooks, AB | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 376      
Initial cost of building and improvements 4,951      
Cost Capitalized Subsequent to Acquisition 130      
Carrying amount of land and land improvements 384      
Carrying amount of building and improvements 5,073      
Accumulated depreciation 1,143      
Bucyrus, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,119      
Initial cost of building and improvements 2,611      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,119      
Carrying amount of building and improvements 2,611      
Accumulated depreciation 378      
Burleson, TX | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 670      
Initial cost of building and improvements 13,985      
Cost Capitalized Subsequent to Acquisition 2,457      
Carrying amount of land and land improvements 670      
Carrying amount of building and improvements 16,442      
Accumulated depreciation 4,835      
Burlington, NC 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 280      
Initial cost of building and improvements 4,297      
Cost Capitalized Subsequent to Acquisition 849      
Carrying amount of land and land improvements 280      
Carrying amount of building and improvements 5,146      
Accumulated depreciation 2,516      
Burlington, NC 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 460      
Initial cost of building and improvements 5,467      
Cost Capitalized Subsequent to Acquisition 110      
Carrying amount of land and land improvements 460      
Carrying amount of building and improvements 5,577      
Accumulated depreciation 2,788      
Burnaby, BC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 7,623      
Initial cost of building and improvements 13,844      
Cost Capitalized Subsequent to Acquisition 497      
Carrying amount of land and land improvements 7,796      
Carrying amount of building and improvements 14,168      
Accumulated depreciation 3,227      
Calgary, AB 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,341      
Initial cost of building and improvements 42,768      
Cost Capitalized Subsequent to Acquisition 1,090      
Carrying amount of land and land improvements 2,394      
Carrying amount of building and improvements 43,805      
Accumulated depreciation 9,550      
Calgary, AB 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 4,569      
Initial cost of building and improvements 70,199      
Cost Capitalized Subsequent to Acquisition 1,706      
Carrying amount of land and land improvements 4,672      
Carrying amount of building and improvements 71,802      
Accumulated depreciation 15,537      
Camp Hill, PA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 517      
Initial cost of building and improvements 3,596      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 517      
Carrying amount of building and improvements 3,596      
Accumulated depreciation 438      
Canonsburg, PA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 911      
Initial cost of building and improvements 4,828      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 911      
Carrying amount of building and improvements 4,828      
Accumulated depreciation 642      
Canton, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 300      
Initial cost of building and improvements 2,098      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 300      
Carrying amount of building and improvements 2,098      
Accumulated depreciation 1,313      
Canton, MI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,399      
Initial cost of building and improvements 16,966      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,399      
Carrying amount of building and improvements 16,966      
Accumulated depreciation 1,991      
Cape Coral, FL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 530      
Initial cost of building and improvements 3,281      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 530      
Carrying amount of building and improvements 3,281      
Accumulated depreciation 1,785      
Carlisle, PA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 978      
Initial cost of building and improvements 8,204      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 978      
Carrying amount of building and improvements 8,204      
Accumulated depreciation 1,025      
Carmel, IN 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,700      
Initial cost of building and improvements 19,491      
Cost Capitalized Subsequent to Acquisition 1      
Carrying amount of land and land improvements 1,700      
Carrying amount of building and improvements 19,492      
Accumulated depreciation 4,171      
Carmel, IN 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,222      
Initial cost of building and improvements 31,004      
Cost Capitalized Subsequent to Acquisition 666      
Carrying amount of land and land improvements 2,222      
Carrying amount of building and improvements 31,670      
Accumulated depreciation 1,614      
Carrollton, TX | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,010      
Initial cost of building and improvements 19,549      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,010      
Carrying amount of building and improvements 19,549      
Accumulated depreciation 3,315      
Cary, NC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,500      
Initial cost of building and improvements 4,350      
Cost Capitalized Subsequent to Acquisition 1,928      
Carrying amount of land and land improvements 1,500      
Carrying amount of building and improvements 6,278      
Accumulated depreciation 3,213      
Castleton, IN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 920      
Initial cost of building and improvements 15,137      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 920      
Carrying amount of building and improvements 15,137      
Accumulated depreciation 3,719      
Cedar Rapids, IA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 596      
Initial cost of building and improvements 9,354      
Cost Capitalized Subsequent to Acquisition 16      
Carrying amount of land and land improvements 614      
Carrying amount of building and improvements 9,352      
Accumulated depreciation 1,078      
Centerville, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 920      
Initial cost of building and improvements 3,958      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 920      
Carrying amount of building and improvements 3,958      
Accumulated depreciation 706      
Chagrin Falls, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 832      
Initial cost of building and improvements 10,837      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 832      
Carrying amount of building and improvements 10,837      
Accumulated depreciation 1,332      
Chambersburg, PA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,373      
Initial cost of building and improvements 8,862      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,373      
Carrying amount of building and improvements 8,862      
Accumulated depreciation 1,145      
Chapel Hill, NC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 354      
Initial cost of building and improvements 2,646      
Cost Capitalized Subsequent to Acquisition 1,617      
Carrying amount of land and land improvements 354      
Carrying amount of building and improvements 4,263      
Accumulated depreciation 1,827      
Charlottesville, VA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,542      
Initial cost of building and improvements 40,746      
Cost Capitalized Subsequent to Acquisition 52      
Carrying amount of land and land improvements 2,542      
Carrying amount of building and improvements 40,798      
Accumulated depreciation 1,283      
Chatham, VA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 320      
Initial cost of building and improvements 14,039      
Cost Capitalized Subsequent to Acquisition 219      
Carrying amount of land and land improvements 320      
Carrying amount of building and improvements 14,258      
Accumulated depreciation 3,341      
Chattanooga, TN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,085      
Initial cost of building and improvements 11,837      
Cost Capitalized Subsequent to Acquisition 917      
Carrying amount of land and land improvements 2,085      
Carrying amount of building and improvements 12,754      
Accumulated depreciation 2,222      
Cherry Hill, NJ | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,416      
Initial cost of building and improvements 9,871      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,416      
Carrying amount of building and improvements 9,871      
Accumulated depreciation 1,263      
Chester, VA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,320      
Initial cost of building and improvements 18,127      
Cost Capitalized Subsequent to Acquisition 499      
Carrying amount of land and land improvements 1,320      
Carrying amount of building and improvements 18,626      
Accumulated depreciation 4,266      
Chevy Chase, MD | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 4,515      
Initial cost of building and improvements 8,685      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 4,515      
Carrying amount of building and improvements 8,685      
Accumulated depreciation 1,046      
Chickasha, OK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 85      
Initial cost of building and improvements 1,395      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 85      
Carrying amount of building and improvements 1,395      
Accumulated depreciation 961      
Chillicothe, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,145      
Initial cost of building and improvements 8,994      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,145      
Carrying amount of building and improvements 8,994      
Accumulated depreciation 1,076      
Cincinnati, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 912      
Initial cost of building and improvements 14,010      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 912      
Carrying amount of building and improvements 14,010      
Accumulated depreciation 1,702      
Citrus Heights, CA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 5,207      
Initial cost of building and improvements 31,715      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 5,207      
Carrying amount of building and improvements 31,715      
Accumulated depreciation 3,625      
Claremore, OK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 155      
Initial cost of building and improvements 1,427      
Cost Capitalized Subsequent to Acquisition 6,130      
Carrying amount of land and land improvements 155      
Carrying amount of building and improvements 7,557      
Accumulated depreciation 2,343      
Clarksville, TN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 330      
Initial cost of building and improvements 2,292      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 330      
Carrying amount of building and improvements 2,292      
Accumulated depreciation 1,430      
Clayton, NC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 520      
Initial cost of building and improvements 15,733      
Cost Capitalized Subsequent to Acquisition 94      
Carrying amount of land and land improvements 520      
Carrying amount of building and improvements 15,827      
Accumulated depreciation 3,506      
Cleburne, TX | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,113      
Initial cost of building and improvements 10,560      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,113      
Carrying amount of building and improvements 10,560      
Accumulated depreciation 192      
Clevedon, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,778      
Initial cost of building and improvements 16,570      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,778      
Carrying amount of building and improvements 16,570      
Accumulated depreciation 3,638      
Clifton, NJ | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,881      
Initial cost of building and improvements 34,941      
Cost Capitalized Subsequent to Acquisition 18      
Carrying amount of land and land improvements 3,881      
Carrying amount of building and improvements 34,959      
Accumulated depreciation 2,052      
Cloquet, MN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 340      
Initial cost of building and improvements 4,660      
Cost Capitalized Subsequent to Acquisition 120      
Carrying amount of land and land improvements 340      
Carrying amount of building and improvements 4,780      
Accumulated depreciation 1,509      
Cobham, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 9,601      
Initial cost of building and improvements 24,464      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 9,601      
Carrying amount of building and improvements 24,464      
Accumulated depreciation 6,021      
Colorado Springs, CO 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 4,280      
Initial cost of building and improvements 62,168      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 4,280      
Carrying amount of building and improvements 62,168      
Accumulated depreciation 11,722      
Colorado Springs, CO 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,730      
Initial cost of building and improvements 25,493      
Cost Capitalized Subsequent to Acquisition 693      
Carrying amount of land and land improvements 1,730      
Carrying amount of building and improvements 26,186      
Accumulated depreciation 5,126      
Columbia, TN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 341      
Initial cost of building and improvements 2,295      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 341      
Carrying amount of building and improvements 2,295      
Accumulated depreciation 1,430      
Columbia, SC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,699      
Initial cost of building and improvements 2,319      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,699      
Carrying amount of building and improvements 2,319      
Accumulated depreciation 310      
Columbia Heights, MN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 825      
Initial cost of building and improvements 14,175      
Cost Capitalized Subsequent to Acquisition 163      
Carrying amount of land and land improvements 825      
Carrying amount of building and improvements 14,338      
Accumulated depreciation 4,255      
Concord, NC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 550      
Initial cost of building and improvements 3,921      
Cost Capitalized Subsequent to Acquisition 683      
Carrying amount of land and land improvements 550      
Carrying amount of building and improvements 4,604      
Accumulated depreciation 2,137      
Congleton, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,993      
Initial cost of building and improvements 5,012      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,993      
Carrying amount of building and improvements 5,012      
Accumulated depreciation 1,077      
Conroe, TX | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,440      
Initial cost of building and improvements 6,136      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,440      
Carrying amount of building and improvements 6,136      
Accumulated depreciation 113      
Corby, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,228      
Initial cost of building and improvements 5,144      
Cost Capitalized Subsequent to Acquisition 39      
Carrying amount of land and land improvements 1,096      
Carrying amount of building and improvements 5,315      
Accumulated depreciation 818      
Costa Mesa, CA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,050      
Initial cost of building and improvements 19,969      
Cost Capitalized Subsequent to Acquisition 1,003      
Carrying amount of land and land improvements 2,050      
Carrying amount of building and improvements 20,972      
Accumulated depreciation 7,730      
Coventry, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 0      
Initial cost of building and improvements 0      
Cost Capitalized Subsequent to Acquisition 15,458      
Carrying amount of land and land improvements 1,920      
Carrying amount of building and improvements 13,538      
Accumulated depreciation 2,799      
Crawfordsville, IN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 720      
Initial cost of building and improvements 17,239      
Cost Capitalized Subsequent to Acquisition 1,426      
Carrying amount of land and land improvements 720      
Carrying amount of building and improvements 18,665      
Accumulated depreciation 4,446      
Cypress, TX | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,145      
Initial cost of building and improvements 14,552      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,145      
Carrying amount of building and improvements 14,552      
Accumulated depreciation 259      
Dallastown, PA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,377      
Initial cost of building and improvements 16,797      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,377      
Carrying amount of building and improvements 16,797      
Accumulated depreciation 2,043      
Danville, VA 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 410      
Initial cost of building and improvements 3,954      
Cost Capitalized Subsequent to Acquisition 1,073      
Carrying amount of land and land improvements 410      
Carrying amount of building and improvements 5,027      
Accumulated depreciation 2,401      
Danville, VA 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 240      
Initial cost of building and improvements 8,436      
Cost Capitalized Subsequent to Acquisition 1,325      
Carrying amount of land and land improvements 240      
Carrying amount of building and improvements 9,761      
Accumulated depreciation 2,025      
Daphne, AL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,880      
Initial cost of building and improvements 8,670      
Cost Capitalized Subsequent to Acquisition 384      
Carrying amount of land and land improvements 2,880      
Carrying amount of building and improvements 9,054      
Accumulated depreciation 2,662      
Davenport, IA 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 566      
Initial cost of building and improvements 2,017      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 566      
Carrying amount of building and improvements 2,017      
Accumulated depreciation 252      
Davenport, IA 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 910      
Initial cost of building and improvements 20,038      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 910      
Carrying amount of building and improvements 20,038      
Accumulated depreciation 2,370      
Dayton, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,188      
Initial cost of building and improvements 5,412      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,188      
Carrying amount of building and improvements 5,412      
Accumulated depreciation 702      
Dearborn Heights, MI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,197      
Initial cost of building and improvements 3,394      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,197      
Carrying amount of building and improvements 3,394      
Accumulated depreciation 484      
Decatur, GA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,413      
Initial cost of building and improvements 13,796      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,413      
Carrying amount of building and improvements 13,796      
Accumulated depreciation 1,561      
Delray Beach, FL 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,158      
Initial cost of building and improvements 13,572      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,158      
Carrying amount of building and improvements 13,572      
Accumulated depreciation 1,661      
Delray Beach, FL 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,125      
Initial cost of building and improvements 11,840      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,125      
Carrying amount of building and improvements 11,840      
Accumulated depreciation 1,490      
Denver, CO | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,222      
Initial cost of building and improvements 24,804      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 3,222      
Carrying amount of building and improvements 24,804      
Accumulated depreciation 2,819      
Derby, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 0      
Initial cost of building and improvements 0      
Cost Capitalized Subsequent to Acquisition 10,319      
Carrying amount of land and land improvements 2,234      
Carrying amount of building and improvements 8,085      
Accumulated depreciation 1,483      
Dowagiac, MI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 825      
Initial cost of building and improvements 1,778      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 825      
Carrying amount of building and improvements 1,778      
Accumulated depreciation 277      
Droitwich, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 0      
Initial cost of building and improvements 0      
Cost Capitalized Subsequent to Acquisition 14,479      
Carrying amount of land and land improvements 3,443      
Carrying amount of building and improvements 11,036      
Accumulated depreciation 667      
Dublin, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,393      
Initial cost of building and improvements 2,911      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,393      
Carrying amount of building and improvements 2,911      
Accumulated depreciation 431      
Dubuque, IA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 568      
Initial cost of building and improvements 8,902      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 568      
Carrying amount of building and improvements 8,902      
Accumulated depreciation 1,028      
Dunedin, FL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,883      
Initial cost of building and improvements 13,325      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,883      
Carrying amount of building and improvements 13,325      
Accumulated depreciation 1,548      
Durham, NC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,476      
Initial cost of building and improvements 10,659      
Cost Capitalized Subsequent to Acquisition 3,220      
Carrying amount of land and land improvements 1,476      
Carrying amount of building and improvements 13,879      
Accumulated depreciation 12,764      
Eagan, MN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 15,252      
Initial cost of land and land improvements 2,260      
Initial cost of building and improvements 31,643      
Cost Capitalized Subsequent to Acquisition 300      
Carrying amount of land and land improvements 2,260      
Carrying amount of building and improvements 31,943      
Accumulated depreciation 5,887      
East Brunswick, NJ | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,380      
Initial cost of building and improvements 34,229      
Cost Capitalized Subsequent to Acquisition 1,235      
Carrying amount of land and land improvements 1,380      
Carrying amount of building and improvements 35,464      
Accumulated depreciation 10,583      
Eastbourne, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,985      
Initial cost of building and improvements 23,923      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 3,985      
Carrying amount of building and improvements 23,923      
Accumulated depreciation 5,185      
Easton, PA 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,109      
Initial cost of building and improvements 7,500      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,109      
Carrying amount of building and improvements 7,500      
Accumulated depreciation 1,187      
Easton, PA 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,430      
Initial cost of building and improvements 13,396      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,430      
Carrying amount of building and improvements 13,396      
Accumulated depreciation 1,637      
Easton, PA 3 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,620      
Initial cost of building and improvements 10,049      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,620      
Carrying amount of building and improvements 10,049      
Accumulated depreciation 1,450      
Eden, NC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 390      
Initial cost of building and improvements 4,877      
Cost Capitalized Subsequent to Acquisition 186      
Carrying amount of land and land improvements 390      
Carrying amount of building and improvements 5,063      
Accumulated depreciation 2,508      
Edmond, OK 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,810      
Initial cost of building and improvements 14,849      
Cost Capitalized Subsequent to Acquisition 3,431      
Carrying amount of land and land improvements 1,810      
Carrying amount of building and improvements 18,280      
Accumulated depreciation 3,948      
Edmond, OK 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,650      
Initial cost of building and improvements 25,167      
Cost Capitalized Subsequent to Acquisition 1,700      
Carrying amount of land and land improvements 1,650      
Carrying amount of building and improvements 26,867      
Accumulated depreciation 4,268      
Elizabeth City, NC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 200      
Initial cost of building and improvements 2,760      
Cost Capitalized Subsequent to Acquisition 2,841      
Carrying amount of land and land improvements 200      
Carrying amount of building and improvements 5,601      
Accumulated depreciation 2,712      
Elk Grove Village, IL 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,344      
Initial cost of building and improvements 7,073      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,344      
Carrying amount of building and improvements 7,073      
Accumulated depreciation 904      
Elk Grove Village, IL 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,733      
Initial cost of building and improvements 18,745      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 3,733      
Carrying amount of building and improvements 18,745      
Accumulated depreciation 2,120      
Encinitas, CA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,460      
Initial cost of building and improvements 7,721      
Cost Capitalized Subsequent to Acquisition 2,054      
Carrying amount of land and land improvements 1,460      
Carrying amount of building and improvements 9,775      
Accumulated depreciation 5,580      
Escondido, CA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,520      
Initial cost of building and improvements 24,024      
Cost Capitalized Subsequent to Acquisition 1,140      
Carrying amount of land and land improvements 1,520      
Carrying amount of building and improvements 25,164      
Accumulated depreciation 8,999      
Everett, WA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,400      
Initial cost of building and improvements 5,476      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,400      
Carrying amount of building and improvements 5,476      
Accumulated depreciation 3,341      
Exton, PA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,600      
Initial cost of building and improvements 27,267      
Cost Capitalized Subsequent to Acquisition 342      
Carrying amount of land and land improvements 3,600      
Carrying amount of building and improvements 27,609      
Accumulated depreciation 3,915      
Fairfax, VA 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,827      
Initial cost of building and improvements 17,304      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,827      
Carrying amount of building and improvements 17,304      
Accumulated depreciation 2,133      
Fairfax, VA 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 4,099      
Initial cost of building and improvements 17,614      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 4,099      
Carrying amount of building and improvements 17,614      
Accumulated depreciation 2,125      
Fairhope, AL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 570      
Initial cost of building and improvements 9,119      
Cost Capitalized Subsequent to Acquisition 112      
Carrying amount of land and land improvements 570      
Carrying amount of building and improvements 9,231      
Accumulated depreciation 2,672      
Fall River, MA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 620      
Initial cost of building and improvements 5,829      
Cost Capitalized Subsequent to Acquisition 4,856      
Carrying amount of land and land improvements 620      
Carrying amount of building and improvements 10,685      
Accumulated depreciation 6,471      
Fanwood, NJ | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,850      
Initial cost of building and improvements 55,175      
Cost Capitalized Subsequent to Acquisition 2,021      
Carrying amount of land and land improvements 2,850      
Carrying amount of building and improvements 57,196      
Accumulated depreciation 16,687      
Faribault, MN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 780      
Initial cost of building and improvements 11,539      
Cost Capitalized Subsequent to Acquisition 300      
Carrying amount of land and land improvements 780      
Carrying amount of building and improvements 11,839      
Accumulated depreciation 2,186      
Farmington, CT | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,693      
Initial cost of building and improvements 10,455      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,693      
Carrying amount of building and improvements 10,455      
Accumulated depreciation 1,315      
Farnborough, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,993      
Initial cost of building and improvements 5,616      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,993      
Carrying amount of building and improvements 5,616      
Accumulated depreciation 1,173      
Fayetteville, PA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,150      
Initial cost of building and improvements 20,244      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,150      
Carrying amount of building and improvements 20,244      
Accumulated depreciation 5,611      
Fayetteville, NY | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 410      
Initial cost of building and improvements 3,962      
Cost Capitalized Subsequent to Acquisition 500      
Carrying amount of land and land improvements 410      
Carrying amount of building and improvements 4,462      
Accumulated depreciation 2,400      
Findlay, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 200      
Initial cost of building and improvements 1,800      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 200      
Carrying amount of building and improvements 1,800      
Accumulated depreciation 1,190      
Fishers, IN 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,500      
Initial cost of building and improvements 14,500      
Cost Capitalized Subsequent to Acquisition 2,399      
Carrying amount of land and land improvements 1,500      
Carrying amount of building and improvements 16,899      
Accumulated depreciation 5,177      
Fishers, IN 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,314      
Initial cost of building and improvements 33,731      
Cost Capitalized Subsequent to Acquisition 409      
Carrying amount of land and land improvements 2,314      
Carrying amount of building and improvements 34,140      
Accumulated depreciation 1,759      
Fishersville, VA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 788      
Initial cost of building and improvements 2,101      
Cost Capitalized Subsequent to Acquisition 3      
Carrying amount of land and land improvements 788      
Carrying amount of building and improvements 2,104      
Accumulated depreciation 1,382      
Flint, MI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,271      
Initial cost of building and improvements 18,050      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,271      
Carrying amount of building and improvements 18,050      
Accumulated depreciation 2,068      
Florence, NJ | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 300      
Initial cost of building and improvements 2,978      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 300      
Carrying amount of building and improvements 2,978      
Accumulated depreciation 1,616      
Floyd, VA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 680      
Initial cost of building and improvements 3,618      
Cost Capitalized Subsequent to Acquisition 4      
Carrying amount of land and land improvements 680      
Carrying amount of building and improvements 3,622      
Accumulated depreciation 1,112      
Forest City, NC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 320      
Initial cost of building and improvements 4,497      
Cost Capitalized Subsequent to Acquisition 226      
Carrying amount of land and land improvements 320      
Carrying amount of building and improvements 4,723      
Accumulated depreciation 2,324      
Fort Collins, CO | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,680      
Initial cost of building and improvements 58,608      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 3,680      
Carrying amount of building and improvements 58,608      
Accumulated depreciation 11,015      
Fort Wayne, IN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,770      
Initial cost of building and improvements 19,930      
Cost Capitalized Subsequent to Acquisition 1,771      
Carrying amount of land and land improvements 1,770      
Carrying amount of building and improvements 21,701      
Accumulated depreciation 6,865      
Fort Worth, TX 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 450      
Initial cost of building and improvements 13,615      
Cost Capitalized Subsequent to Acquisition 5,086      
Carrying amount of land and land improvements 450      
Carrying amount of building and improvements 18,701      
Accumulated depreciation 6,618      
Fort Worth, TX 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,565      
Initial cost of building and improvements 15,982      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,565      
Carrying amount of building and improvements 15,982      
Accumulated depreciation 283      
Fountain Valley, CA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 5,259      
Initial cost of building and improvements 9,375      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 5,259      
Carrying amount of building and improvements 9,375      
Accumulated depreciation 1,128      
Fredericksburg, VA 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,000      
Initial cost of building and improvements 20,000      
Cost Capitalized Subsequent to Acquisition 2,161      
Carrying amount of land and land improvements 1,000      
Carrying amount of building and improvements 22,161      
Accumulated depreciation 9,536      
Fredericksburg, VA 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,130      
Initial cost of building and improvements 23,202      
Cost Capitalized Subsequent to Acquisition 591      
Carrying amount of land and land improvements 1,130      
Carrying amount of building and improvements 23,793      
Accumulated depreciation 5,341      
Ft. Myers, FL 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,110      
Initial cost of building and improvements 10,559      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,110      
Carrying amount of building and improvements 10,559      
Accumulated depreciation 1,306      
Ft. Myers, FL 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,139      
Initial cost of building and improvements 18,235      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,139      
Carrying amount of building and improvements 18,235      
Accumulated depreciation 2,205      
Ft. Myers, FL 3 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,502      
Initial cost of building and improvements 9,741      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,502      
Carrying amount of building and improvements 9,741      
Accumulated depreciation 1,425      
Gahanna, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,432      
Initial cost of building and improvements 34,645      
Cost Capitalized Subsequent to Acquisition 661      
Carrying amount of land and land improvements 2,432      
Carrying amount of building and improvements 35,306      
Accumulated depreciation 1,501      
Gainesville, FL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 972      
Initial cost of building and improvements 8,809      
Cost Capitalized Subsequent to Acquisition 125      
Carrying amount of land and land improvements 972      
Carrying amount of building and improvements 8,934      
Accumulated depreciation 658      
Galesburg, IL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,708      
Initial cost of building and improvements 3,839      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,708      
Carrying amount of building and improvements 3,839      
Accumulated depreciation 470      
Gardner, KS | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 200      
Initial cost of building and improvements 2,800      
Cost Capitalized Subsequent to Acquisition 98      
Carrying amount of land and land improvements 200      
Carrying amount of building and improvements 2,898      
Accumulated depreciation 611      
Gastonia, NC 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 470      
Initial cost of building and improvements 6,129      
Cost Capitalized Subsequent to Acquisition 77      
Carrying amount of land and land improvements 470      
Carrying amount of building and improvements 6,206      
Accumulated depreciation 3,116      
Gastonia, NC 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 310      
Initial cost of building and improvements 3,096      
Cost Capitalized Subsequent to Acquisition 113      
Carrying amount of land and land improvements 310      
Carrying amount of building and improvements 3,209      
Accumulated depreciation 1,640      
Gastonia, NC 3 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 400      
Initial cost of building and improvements 5,029      
Cost Capitalized Subsequent to Acquisition 807      
Carrying amount of land and land improvements 400      
Carrying amount of building and improvements 5,836      
Accumulated depreciation 2,627      
Geneva, IL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,502      
Initial cost of building and improvements 16,193      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,502      
Carrying amount of building and improvements 16,193      
Accumulated depreciation 1,951      
Georgetown, TX | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 200      
Initial cost of building and improvements 2,100      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 200      
Carrying amount of building and improvements 2,100      
Accumulated depreciation 1,378      
Gig Harbor, WA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,000      
Initial cost of building and improvements 4,461      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 3,000      
Carrying amount of building and improvements 4,461      
Accumulated depreciation 660      
Glen Ellyn, IL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,496      
Initial cost of building and improvements 6,634      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,496      
Carrying amount of building and improvements 6,634      
Accumulated depreciation 889      
Granbury, TX | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,550      
Initial cost of building and improvements 2,940      
Cost Capitalized Subsequent to Acquisition 777      
Carrying amount of land and land improvements 2,550      
Carrying amount of building and improvements 3,717      
Accumulated depreciation 1,295      
Granger, IN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,670      
Initial cost of building and improvements 21,280      
Cost Capitalized Subsequent to Acquisition 2,645      
Carrying amount of land and land improvements 1,670      
Carrying amount of building and improvements 23,925      
Accumulated depreciation 7,478      
Greensboro, NC 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 330      
Initial cost of building and improvements 2,970      
Cost Capitalized Subsequent to Acquisition 662      
Carrying amount of land and land improvements 330      
Carrying amount of building and improvements 3,632      
Accumulated depreciation 1,832      
Greensboro, NC 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 560      
Initial cost of building and improvements 5,507      
Cost Capitalized Subsequent to Acquisition 2,377      
Carrying amount of land and land improvements 560      
Carrying amount of building and improvements 7,884      
Accumulated depreciation 3,375      
Greenville, MI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,490      
Initial cost of building and improvements 4,341      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,490      
Carrying amount of building and improvements 4,341      
Accumulated depreciation 531      
Greenville, SC 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 310      
Initial cost of building and improvements 4,750      
Cost Capitalized Subsequent to Acquisition 521      
Carrying amount of land and land improvements 310      
Carrying amount of building and improvements 5,271      
Accumulated depreciation 2,363      
Greenville, SC 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,751      
Initial cost of building and improvements 8,771      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,751      
Carrying amount of building and improvements 8,771      
Accumulated depreciation 1,085      
Greenville, SC 3 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 947      
Initial cost of building and improvements 1,445      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 947      
Carrying amount of building and improvements 1,445      
Accumulated depreciation 300      
Greenville, NC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 290      
Initial cost of building and improvements 4,393      
Cost Capitalized Subsequent to Acquisition 353      
Carrying amount of land and land improvements 290      
Carrying amount of building and improvements 4,746      
Accumulated depreciation 2,313      
Greenwood, IN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,550      
Initial cost of building and improvements 22,770      
Cost Capitalized Subsequent to Acquisition 406      
Carrying amount of land and land improvements 1,550      
Carrying amount of building and improvements 23,176      
Accumulated depreciation 7,316      
Grosse Pointe, MI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 867      
Initial cost of building and improvements 2,385      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 867      
Carrying amount of building and improvements 2,385      
Accumulated depreciation 309      
Hamilton, NJ | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 440      
Initial cost of building and improvements 4,469      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 440      
Carrying amount of building and improvements 4,469      
Accumulated depreciation 2,421      
Hanford, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,353      
Initial cost of building and improvements 9,622      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,353      
Carrying amount of building and improvements 9,622      
Accumulated depreciation 2,392      
Harrisburg, PA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 569      
Initial cost of building and improvements 12,822      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 569      
Carrying amount of building and improvements 12,822      
Accumulated depreciation 1,537      
Harrow, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 7,246      
Initial cost of building and improvements 8,092      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 7,246      
Carrying amount of building and improvements 8,092      
Accumulated depreciation 1,807      
Hastings, MI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,603      
Initial cost of building and improvements 6,519      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,603      
Carrying amount of building and improvements 6,519      
Accumulated depreciation 665      
Hatboro, PA 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 0      
Initial cost of building and improvements 28,112      
Cost Capitalized Subsequent to Acquisition 1,771      
Carrying amount of land and land improvements 0      
Carrying amount of building and improvements 29,883      
Accumulated depreciation 9,293      
Hatboro, PA 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,192      
Initial cost of building and improvements 7,608      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,192      
Carrying amount of building and improvements 7,608      
Accumulated depreciation 1,244      
Hatfield, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,862      
Initial cost of building and improvements 7,368      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,862      
Carrying amount of building and improvements 7,368      
Accumulated depreciation 1,846      
Haverhill, MA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 5,519      
Initial cost of building and improvements 19,554      
Cost Capitalized Subsequent to Acquisition 64      
Carrying amount of land and land improvements 5,519      
Carrying amount of building and improvements 19,618      
Accumulated depreciation 734      
Hemet, CA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 6,224      
Initial cost of building and improvements 8,410      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 6,224      
Carrying amount of building and improvements 8,410      
Accumulated depreciation 1,048      
Hermitage, TN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,500      
Initial cost of building and improvements 9,943      
Cost Capitalized Subsequent to Acquisition 540      
Carrying amount of land and land improvements 1,500      
Carrying amount of building and improvements 10,483      
Accumulated depreciation 3,020      
Herne Bay, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,900      
Initial cost of building and improvements 24,353      
Cost Capitalized Subsequent to Acquisition 123      
Carrying amount of land and land improvements 1,860      
Carrying amount of building and improvements 24,516      
Accumulated depreciation 6,455      
Hiawatha, KS | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 40      
Initial cost of building and improvements 4,210      
Cost Capitalized Subsequent to Acquisition 31      
Carrying amount of land and land improvements 40      
Carrying amount of building and improvements 4,241      
Accumulated depreciation 869      
Hickory, NC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 290      
Initial cost of building and improvements 987      
Cost Capitalized Subsequent to Acquisition 392      
Carrying amount of land and land improvements 290      
Carrying amount of building and improvements 1,379      
Accumulated depreciation 742      
High Point, NC 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 560      
Initial cost of building and improvements 4,443      
Cost Capitalized Subsequent to Acquisition 1,406      
Carrying amount of land and land improvements 560      
Carrying amount of building and improvements 5,849      
Accumulated depreciation 2,694      
High Point, NC 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 370      
Initial cost of building and improvements 2,185      
Cost Capitalized Subsequent to Acquisition 999      
Carrying amount of land and land improvements 370      
Carrying amount of building and improvements 3,184      
Accumulated depreciation 1,382      
High Point, NC 3 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 330      
Initial cost of building and improvements 3,395      
Cost Capitalized Subsequent to Acquisition 142      
Carrying amount of land and land improvements 330      
Carrying amount of building and improvements 3,537      
Accumulated depreciation 1,769      
High Point, NC 4 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 430      
Initial cost of building and improvements 4,143      
Cost Capitalized Subsequent to Acquisition 1,007      
Carrying amount of land and land improvements 430      
Carrying amount of building and improvements 5,150      
Accumulated depreciation 2,131      
Highlands Ranch, CO | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 940      
Initial cost of building and improvements 3,721      
Cost Capitalized Subsequent to Acquisition 4,983      
Carrying amount of land and land improvements 940      
Carrying amount of building and improvements 8,704      
Accumulated depreciation 3,153      
Hillsboro, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,792      
Initial cost of building and improvements 6,339      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,792      
Carrying amount of building and improvements 6,339      
Accumulated depreciation 1,072      
Hinckley, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,113      
Initial cost of building and improvements 4,106      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,113      
Carrying amount of building and improvements 4,106      
Accumulated depreciation 1,126      
Hinsdale, IL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 4,033      
Initial cost of building and improvements 24,280      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 4,033      
Carrying amount of building and improvements 24,280      
Accumulated depreciation 2,764      
Holton, KS | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 40      
Initial cost of building and improvements 7,460      
Cost Capitalized Subsequent to Acquisition 13      
Carrying amount of land and land improvements 40      
Carrying amount of building and improvements 7,473      
Accumulated depreciation 1,427      
Homewood, IL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,395      
Initial cost of building and improvements 7,649      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,395      
Carrying amount of building and improvements 7,649      
Accumulated depreciation 891      
Howard, WI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 579      
Initial cost of building and improvements 32,122      
Cost Capitalized Subsequent to Acquisition 5,943      
Carrying amount of land and land improvements 684      
Carrying amount of building and improvements 37,960      
Accumulated depreciation 5,774      
Huntingdon Valley, PA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,150      
Initial cost of building and improvements 3,728      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,150      
Carrying amount of building and improvements 3,728      
Accumulated depreciation 647      
Huntsville, AL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,382      
Initial cost of building and improvements 14,286      
Cost Capitalized Subsequent to Acquisition 90      
Carrying amount of land and land improvements 1,382      
Carrying amount of building and improvements 14,376      
Accumulated depreciation 960      
Independence, VA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,082      
Initial cost of building and improvements 6,767      
Cost Capitalized Subsequent to Acquisition 7      
Carrying amount of land and land improvements 1,082      
Carrying amount of building and improvements 6,774      
Accumulated depreciation 2,007      
Indianapolis, IN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 870      
Initial cost of building and improvements 14,688      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 870      
Carrying amount of building and improvements 14,688      
Accumulated depreciation 3,624      
Jackson, NJ | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 6,500      
Initial cost of building and improvements 26,405      
Cost Capitalized Subsequent to Acquisition 7,910      
Carrying amount of land and land improvements 6,500      
Carrying amount of building and improvements 34,315      
Accumulated depreciation 7,606      
Jacksonville, FL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,932      
Initial cost of building and improvements 14,269      
Cost Capitalized Subsequent to Acquisition 129      
Carrying amount of land and land improvements 2,932      
Carrying amount of building and improvements 14,398      
Accumulated depreciation 1,021      
Jefferson Hills, PA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,265      
Initial cost of building and improvements 13,614      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,265      
Carrying amount of building and improvements 13,614      
Accumulated depreciation 2,385      
Jersey Shore, PA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 600      
Initial cost of building and improvements 8,104      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 600      
Carrying amount of building and improvements 8,104      
Accumulated depreciation 909      
Kansas City, KS | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 700      
Initial cost of building and improvements 20,115      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 700      
Carrying amount of building and improvements 20,115      
Accumulated depreciation 4,028      
Katy, TX | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,778      
Initial cost of building and improvements 22,622      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,778      
Carrying amount of building and improvements 22,622      
Accumulated depreciation 3,689      
Kensington, MD | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,753      
Initial cost of building and improvements 18,621      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,753      
Carrying amount of building and improvements 18,621      
Accumulated depreciation 2,162      
Kenwood, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 821      
Initial cost of building and improvements 11,040      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 821      
Carrying amount of building and improvements 11,040      
Accumulated depreciation 1,324      
Kettering, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,229      
Initial cost of building and improvements 4,701      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,229      
Carrying amount of building and improvements 4,701      
Accumulated depreciation 642      
King of Prussia, PA 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 720      
Initial cost of building and improvements 14,776      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 720      
Carrying amount of building and improvements 14,776      
Accumulated depreciation 1,838      
King of Prussia, PA 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,205      
Initial cost of building and improvements 4,725      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,205      
Carrying amount of building and improvements 4,725      
Accumulated depreciation 695      
Kingsford, MI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,362      
Initial cost of building and improvements 10,594      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,362      
Carrying amount of building and improvements 10,594      
Accumulated depreciation 1,324      
Kirkstall, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,385      
Initial cost of building and improvements 9,216      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,385      
Carrying amount of building and improvements 9,216      
Accumulated depreciation 2,298      
Knoxville, TN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,207      
Initial cost of building and improvements 12,849      
Cost Capitalized Subsequent to Acquisition 1,020      
Carrying amount of land and land improvements 2,207      
Carrying amount of building and improvements 13,869      
Accumulated depreciation 2,432      
Kokomo, IN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 710      
Initial cost of building and improvements 16,044      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 710      
Carrying amount of building and improvements 16,044      
Accumulated depreciation 3,950      
Lacey, WA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,582      
Initial cost of building and improvements 18,175      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,582      
Carrying amount of building and improvements 18,175      
Accumulated depreciation 2,140      
Lafayette, CO | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,420      
Initial cost of building and improvements 20,192      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,420      
Carrying amount of building and improvements 20,192      
Accumulated depreciation 4,286      
Lafayette, IN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 670      
Initial cost of building and improvements 16,833      
Cost Capitalized Subsequent to Acquisition 1      
Carrying amount of land and land improvements 670      
Carrying amount of building and improvements 16,834      
Accumulated depreciation 3,864      
Lakeway, TX | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 5,142      
Initial cost of building and improvements 23,203      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 5,142      
Carrying amount of building and improvements 23,203      
Accumulated depreciation 6,164      
Lakewood, CO | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,160      
Initial cost of building and improvements 28,091      
Cost Capitalized Subsequent to Acquisition 62      
Carrying amount of land and land improvements 2,160      
Carrying amount of building and improvements 28,153      
Accumulated depreciation 6,514      
Lancaster, PA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,011      
Initial cost of building and improvements 7,502      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,011      
Carrying amount of building and improvements 7,502      
Accumulated depreciation 915      
Lapeer, MI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,827      
Initial cost of building and improvements 8,794      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,827      
Carrying amount of building and improvements 8,794      
Accumulated depreciation 843      
Largo, FL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,166      
Initial cost of building and improvements 3,426      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,166      
Carrying amount of building and improvements 3,426      
Accumulated depreciation 540      
Laureldale, PA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,171      
Initial cost of building and improvements 14,420      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,171      
Carrying amount of building and improvements 14,420      
Accumulated depreciation 1,697      
Lebanon, PA 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 728      
Initial cost of building and improvements 10,367      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 728      
Carrying amount of building and improvements 10,367      
Accumulated depreciation 1,336      
Lebanon, PA 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,214      
Initial cost of building and improvements 5,960      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,214      
Carrying amount of building and improvements 5,960      
Accumulated depreciation 861      
Lee, MA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 290      
Initial cost of building and improvements 18,135      
Cost Capitalized Subsequent to Acquisition 926      
Carrying amount of land and land improvements 290      
Carrying amount of building and improvements 19,061      
Accumulated depreciation 10,230      
Leeds, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 0      
Initial cost of building and improvements 0      
Cost Capitalized Subsequent to Acquisition 14,892      
Carrying amount of land and land improvements 1,932      
Carrying amount of building and improvements 12,960      
Accumulated depreciation 2,583      
Leicester, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 0      
Initial cost of building and improvements 0      
Cost Capitalized Subsequent to Acquisition 26,891      
Carrying amount of land and land improvements 2,995      
Carrying amount of building and improvements 23,896      
Accumulated depreciation 6,240      
Lenoir, NC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 190      
Initial cost of building and improvements 3,748      
Cost Capitalized Subsequent to Acquisition 920      
Carrying amount of land and land improvements 190      
Carrying amount of building and improvements 4,668      
Accumulated depreciation 2,253      
Lethbridge, AB | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,214      
Initial cost of building and improvements 2,750      
Cost Capitalized Subsequent to Acquisition 101      
Carrying amount of land and land improvements 1,242      
Carrying amount of building and improvements 2,823      
Accumulated depreciation 793      
Lexana, KS | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 480      
Initial cost of building and improvements 1,770      
Cost Capitalized Subsequent to Acquisition 162      
Carrying amount of land and land improvements 480      
Carrying amount of building and improvements 1,932      
Accumulated depreciation 445      
Lexington, NC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 200      
Initial cost of building and improvements 3,900      
Cost Capitalized Subsequent to Acquisition 1,153      
Carrying amount of land and land improvements 200      
Carrying amount of building and improvements 5,053      
Accumulated depreciation 2,591      
Libertyville, IL 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 6,500      
Initial cost of building and improvements 40,024      
Cost Capitalized Subsequent to Acquisition 4,686      
Carrying amount of land and land improvements 6,500      
Carrying amount of building and improvements 44,710      
Accumulated depreciation 12,935      
Libertyville, IL 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,993      
Initial cost of building and improvements 11,546      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,993      
Carrying amount of building and improvements 11,546      
Accumulated depreciation 1,333      
Lichfield, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,353      
Initial cost of building and improvements 29,685      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,353      
Carrying amount of building and improvements 29,685      
Accumulated depreciation 5,908      
Lillington, NC 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 470      
Initial cost of building and improvements 17,579      
Cost Capitalized Subsequent to Acquisition 757      
Carrying amount of land and land improvements 470      
Carrying amount of building and improvements 18,336      
Accumulated depreciation 4,170      
Lillington, NC 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 500      
Initial cost of building and improvements 16,451      
Cost Capitalized Subsequent to Acquisition 271      
Carrying amount of land and land improvements 500      
Carrying amount of building and improvements 16,722      
Accumulated depreciation 3,664      
Livermore, CA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 4,100      
Initial cost of building and improvements 24,996      
Cost Capitalized Subsequent to Acquisition 79      
Carrying amount of land and land improvements 4,100      
Carrying amount of building and improvements 25,075      
Accumulated depreciation 5,179      
Livonia, MI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 985      
Initial cost of building and improvements 13,555      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 985      
Carrying amount of building and improvements 13,555      
Accumulated depreciation 1,684      
Longwood, FL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,260      
Initial cost of building and improvements 6,445      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,260      
Carrying amount of building and improvements 6,445      
Accumulated depreciation 2,123      
Los Angeles, CA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 0      
Initial cost of building and improvements 11,430      
Cost Capitalized Subsequent to Acquisition 1,119      
Carrying amount of land and land improvements 0      
Carrying amount of building and improvements 12,549      
Accumulated depreciation 4,632      
Louisburg, KS | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 280      
Initial cost of building and improvements 4,320      
Cost Capitalized Subsequent to Acquisition 47      
Carrying amount of land and land improvements 280      
Carrying amount of building and improvements 4,367      
Accumulated depreciation 844      
Louisville, KY | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 490      
Initial cost of building and improvements 10,010      
Cost Capitalized Subsequent to Acquisition 2,768      
Carrying amount of land and land improvements 490      
Carrying amount of building and improvements 12,778      
Accumulated depreciation 5,993      
Loxley, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,369      
Initial cost of building and improvements 15,668      
Cost Capitalized Subsequent to Acquisition 354      
Carrying amount of land and land improvements 1,341      
Carrying amount of building and improvements 16,050      
Accumulated depreciation 3,956      
Lutherville, MD | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,100      
Initial cost of building and improvements 19,786      
Cost Capitalized Subsequent to Acquisition 1,744      
Carrying amount of land and land improvements 1,100      
Carrying amount of building and improvements 21,530      
Accumulated depreciation 6,859      
Lynchburg, VA 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 340      
Initial cost of building and improvements 16,114      
Cost Capitalized Subsequent to Acquisition 260      
Carrying amount of land and land improvements 340      
Carrying amount of building and improvements 16,374      
Accumulated depreciation 3,892      
Lynchburg, VA 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,904      
Initial cost of building and improvements 3,696      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,904      
Carrying amount of building and improvements 3,696      
Accumulated depreciation 445      
Lynnwood, WA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,302      
Initial cost of building and improvements 5,632      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,302      
Carrying amount of building and improvements 5,632      
Accumulated depreciation 688      
Manalapan, NJ | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 900      
Initial cost of building and improvements 22,624      
Cost Capitalized Subsequent to Acquisition 1,096      
Carrying amount of land and land improvements 900      
Carrying amount of building and improvements 23,720      
Accumulated depreciation 7,048      
Manassas, VA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 750      
Initial cost of building and improvements 7,446      
Cost Capitalized Subsequent to Acquisition 1,352      
Carrying amount of land and land improvements 750      
Carrying amount of building and improvements 8,798      
Accumulated depreciation 3,921      
Mankato, MN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,460      
Initial cost of building and improvements 32,104      
Cost Capitalized Subsequent to Acquisition 300      
Carrying amount of land and land improvements 1,460      
Carrying amount of building and improvements 32,404      
Accumulated depreciation 5,952      
Marietta, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,149      
Initial cost of building and improvements 9,373      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,149      
Carrying amount of building and improvements 9,373      
Accumulated depreciation 1,119      
Marietta, PA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,050      
Initial cost of building and improvements 13,633      
Cost Capitalized Subsequent to Acquisition 592      
Carrying amount of land and land improvements 1,050      
Carrying amount of building and improvements 14,225      
Accumulated depreciation 2,661      
Marietta, GA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,406      
Initial cost of building and improvements 12,229      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,406      
Carrying amount of building and improvements 12,229      
Accumulated depreciation 1,429      
Marion, IN 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 720      
Initial cost of building and improvements 9,604      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 720      
Carrying amount of building and improvements 9,604      
Accumulated depreciation 3,035      
Marion, IN 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 990      
Initial cost of building and improvements 7,600      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 990      
Carrying amount of building and improvements 7,600      
Accumulated depreciation 3,710      
Marion, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,768      
Initial cost of building and improvements 17,415      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,768      
Carrying amount of building and improvements 17,415      
Accumulated depreciation 2,648      
Marlborough, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,621      
Initial cost of building and improvements 6,679      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,621      
Carrying amount of building and improvements 6,679      
Accumulated depreciation 1,456      
Martinsville, VA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 349      
Initial cost of building and improvements 0      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 349      
Carrying amount of building and improvements 0      
Accumulated depreciation 0      
Marysville, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 408      
Initial cost of building and improvements 858      
Cost Capitalized Subsequent to Acquisition 457      
Carrying amount of land and land improvements 408      
Carrying amount of building and improvements 1,315      
Accumulated depreciation 177      
Matthews, NC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 560      
Initial cost of building and improvements 4,738      
Cost Capitalized Subsequent to Acquisition 771      
Carrying amount of land and land improvements 560      
Carrying amount of building and improvements 5,509      
Accumulated depreciation 2,473      
McHenry, IL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,576      
Initial cost of building and improvements 0      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,576      
Carrying amount of building and improvements 0      
Accumulated depreciation 0      
McMurray, PA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,440      
Initial cost of building and improvements 15,805      
Cost Capitalized Subsequent to Acquisition 3,894      
Carrying amount of land and land improvements 1,440      
Carrying amount of building and improvements 19,699      
Accumulated depreciation 5,838      
Medicine Hat, AB | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 932      
Initial cost of building and improvements 5,566      
Cost Capitalized Subsequent to Acquisition 157      
Carrying amount of land and land improvements 953      
Carrying amount of building and improvements 5,702      
Accumulated depreciation 1,315      
Mentor, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,827      
Initial cost of building and improvements 9,938      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,827      
Carrying amount of building and improvements 9,938      
Accumulated depreciation 1,203      
Mequon, WI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,238      
Initial cost of building and improvements 17,761      
Cost Capitalized Subsequent to Acquisition 600      
Carrying amount of land and land improvements 2,238      
Carrying amount of building and improvements 18,361      
Accumulated depreciation 791      
Miamisburg, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 786      
Initial cost of building and improvements 3,232      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 786      
Carrying amount of building and improvements 3,232      
Accumulated depreciation 551      
Middleburg Heights, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 960      
Initial cost of building and improvements 7,780      
Cost Capitalized Subsequent to Acquisition 472      
Carrying amount of land and land improvements 960      
Carrying amount of building and improvements 8,252      
Accumulated depreciation 3,726      
Middleton, WI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 420      
Initial cost of building and improvements 4,006      
Cost Capitalized Subsequent to Acquisition 600      
Carrying amount of land and land improvements 420      
Carrying amount of building and improvements 4,606      
Accumulated depreciation 2,367      
Midlothian, VA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,015      
Initial cost of building and improvements 8,602      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,015      
Carrying amount of building and improvements 8,602      
Accumulated depreciation 625      
Milton Keynes, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 0      
Initial cost of building and improvements 0      
Cost Capitalized Subsequent to Acquisition 20,047      
Carrying amount of land and land improvements 1,787      
Carrying amount of building and improvements 18,260      
Accumulated depreciation 3,742      
Minnetonka, MN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,080      
Initial cost of building and improvements 24,360      
Cost Capitalized Subsequent to Acquisition 4,154      
Carrying amount of land and land improvements 2,080      
Carrying amount of building and improvements 28,514      
Accumulated depreciation 8,497      
Mishawaka, IN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 740      
Initial cost of building and improvements 12,188      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 740      
Carrying amount of building and improvements 12,188      
Accumulated depreciation 3,605      
Moline, IL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,946      
Initial cost of building and improvements 18,672      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,946      
Carrying amount of building and improvements 18,672      
Accumulated depreciation 2,111      
Monroe, NC 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 470      
Initial cost of building and improvements 3,681      
Cost Capitalized Subsequent to Acquisition 839      
Carrying amount of land and land improvements 470      
Carrying amount of building and improvements 4,520      
Accumulated depreciation 2,250      
Monroe, NC 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 310      
Initial cost of building and improvements 4,799      
Cost Capitalized Subsequent to Acquisition 922      
Carrying amount of land and land improvements 310      
Carrying amount of building and improvements 5,721      
Accumulated depreciation 2,855      
Monroe, NC 3 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 450      
Initial cost of building and improvements 4,021      
Cost Capitalized Subsequent to Acquisition 417      
Carrying amount of land and land improvements 450      
Carrying amount of building and improvements 4,438      
Accumulated depreciation 2,146      
Monroe Township, NJ | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,250      
Initial cost of building and improvements 27,771      
Cost Capitalized Subsequent to Acquisition 1,118      
Carrying amount of land and land improvements 3,250      
Carrying amount of building and improvements 28,889      
Accumulated depreciation 5,371      
Monroeville, PA 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,216      
Initial cost of building and improvements 12,749      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,216      
Carrying amount of building and improvements 12,749      
Accumulated depreciation 1,833      
Monroeville, PA 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,237      
Initial cost of building and improvements 3,641      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,237      
Carrying amount of building and improvements 3,641      
Accumulated depreciation 697      
Montgomeryville, PA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,176      
Initial cost of building and improvements 9,824      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,176      
Carrying amount of building and improvements 9,824      
Accumulated depreciation 1,249      
Montville, NJ | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,500      
Initial cost of building and improvements 31,002      
Cost Capitalized Subsequent to Acquisition 2,559      
Carrying amount of land and land improvements 3,500      
Carrying amount of building and improvements 33,561      
Accumulated depreciation 10,036      
Moorestown, NJ | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 4,143      
Initial cost of building and improvements 23,902      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 4,143      
Carrying amount of building and improvements 23,902      
Accumulated depreciation 6,073      
Morehead City, NC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 200      
Initial cost of building and improvements 3,104      
Cost Capitalized Subsequent to Acquisition 2,039      
Carrying amount of land and land improvements 200      
Carrying amount of building and improvements 5,143      
Accumulated depreciation 2,705      
Moulton, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,695      
Initial cost of building and improvements 12,510      
Cost Capitalized Subsequent to Acquisition 190      
Carrying amount of land and land improvements 1,513      
Carrying amount of building and improvements 12,882      
Accumulated depreciation 1,881      
Mountainside, NJ | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,097      
Initial cost of building and improvements 7,807      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 3,097      
Carrying amount of building and improvements 7,807      
Accumulated depreciation 957      
Mt. Pleasant, MI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,863      
Initial cost of building and improvements 6,467      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,863      
Carrying amount of building and improvements 6,467      
Accumulated depreciation 743      
Naperville, IL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,470      
Initial cost of building and improvements 29,547      
Cost Capitalized Subsequent to Acquisition 5,862      
Carrying amount of land and land improvements 3,470      
Carrying amount of building and improvements 35,409      
Accumulated depreciation 9,730      
Naples, FL 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,222      
Initial cost of building and improvements 10,639      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,222      
Carrying amount of building and improvements 10,639      
Accumulated depreciation 1,364      
Naples, FL 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,672      
Initial cost of building and improvements 23,119      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,672      
Carrying amount of building and improvements 23,119      
Accumulated depreciation 3,303      
Naples, FL 3 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,854      
Initial cost of building and improvements 12,398      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,854      
Carrying amount of building and improvements 12,398      
Accumulated depreciation 1,432      
Nashville, TN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 4,910      
Initial cost of building and improvements 29,590      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 4,910      
Carrying amount of building and improvements 29,590      
Accumulated depreciation 11,495      
Needham, MA 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,610      
Initial cost of building and improvements 12,667      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,610      
Carrying amount of building and improvements 12,667      
Accumulated depreciation 6,594      
Needham, MA 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,957      
Initial cost of building and improvements 71,163      
Cost Capitalized Subsequent to Acquisition 191      
Carrying amount of land and land improvements 3,957      
Carrying amount of building and improvements 71,354      
Accumulated depreciation 2,068      
New Lenox, IL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,225      
Initial cost of building and improvements 21,575      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,225      
Carrying amount of building and improvements 21,575      
Accumulated depreciation 2,346      
New Moston, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,449      
Initial cost of building and improvements 4,286      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,449      
Carrying amount of building and improvements 4,286      
Accumulated depreciation 1,113      
Newark, DE | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 560      
Initial cost of building and improvements 21,220      
Cost Capitalized Subsequent to Acquisition 2,442      
Carrying amount of land and land improvements 560      
Carrying amount of building and improvements 23,662      
Accumulated depreciation 10,355      
Newport News, VA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 839      
Initial cost of building and improvements 6,077      
Cost Capitalized Subsequent to Acquisition 6      
Carrying amount of land and land improvements 839      
Carrying amount of building and improvements 6,083      
Accumulated depreciation 1,737      
Norman, OK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 55      
Initial cost of building and improvements 1,484      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 55      
Carrying amount of building and improvements 1,484      
Accumulated depreciation 1,062      
North Augusta, SC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 332      
Initial cost of building and improvements 2,558      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 332      
Carrying amount of building and improvements 2,558      
Accumulated depreciation 1,586      
Northampton, UK 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 5,072      
Initial cost of building and improvements 16,983      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 5,072      
Carrying amount of building and improvements 16,983      
Accumulated depreciation 4,378      
Northampton, UK 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,971      
Initial cost of building and improvements 6,125      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,971      
Carrying amount of building and improvements 6,125      
Accumulated depreciation 1,251      
Northbrook, IL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,298      
Initial cost of building and improvements 13,337      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,298      
Carrying amount of building and improvements 13,337      
Accumulated depreciation 1,578      
Nottingham, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 0      
Initial cost of building and improvements 0      
Cost Capitalized Subsequent to Acquisition 7,725      
Carrying amount of land and land improvements 1,594      
Carrying amount of building and improvements 6,131      
Accumulated depreciation 1,239      
Nuneaton, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,255      
Initial cost of building and improvements 8,793      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 3,255      
Carrying amount of building and improvements 8,793      
Accumulated depreciation 2,182      
Nuthall, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,446      
Initial cost of building and improvements 10,216      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,446      
Carrying amount of building and improvements 10,216      
Accumulated depreciation 2,561      
Oak Lawn, IL 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,418      
Initial cost of building and improvements 5,426      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,418      
Carrying amount of building and improvements 5,426      
Accumulated depreciation 638      
Oak Lawn, IL 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,876      
Initial cost of building and improvements 7,985      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 3,876      
Carrying amount of building and improvements 7,985      
Accumulated depreciation 974      
Oakland, CA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 4,760      
Initial cost of building and improvements 16,143      
Cost Capitalized Subsequent to Acquisition 282      
Carrying amount of land and land improvements 4,760      
Carrying amount of building and improvements 16,425      
Accumulated depreciation 3,681      
Olathe, KS | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,930      
Initial cost of building and improvements 19,765      
Cost Capitalized Subsequent to Acquisition 553      
Carrying amount of land and land improvements 1,930      
Carrying amount of building and improvements 20,318      
Accumulated depreciation 4,241      
Ona, WV | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 950      
Initial cost of building and improvements 7,639      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 950      
Carrying amount of building and improvements 7,639      
Accumulated depreciation 2,381      
Oneonta, NY | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 80      
Initial cost of building and improvements 3,839      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 80      
Carrying amount of building and improvements 3,839      
Accumulated depreciation 1,939      
Orem, UT | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,150      
Initial cost of building and improvements 24,107      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,150      
Carrying amount of building and improvements 24,107      
Accumulated depreciation 4,508      
Osage City, KS | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 50      
Initial cost of building and improvements 1,700      
Cost Capitalized Subsequent to Acquisition 151      
Carrying amount of land and land improvements 50      
Carrying amount of building and improvements 1,851      
Accumulated depreciation 445      
Osawatomie, KS | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 130      
Initial cost of building and improvements 2,970      
Cost Capitalized Subsequent to Acquisition 145      
Carrying amount of land and land improvements 130      
Carrying amount of building and improvements 3,115      
Accumulated depreciation 676      
Ottawa, KS | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 160      
Initial cost of building and improvements 6,590      
Cost Capitalized Subsequent to Acquisition 47      
Carrying amount of land and land improvements 160      
Carrying amount of building and improvements 6,637      
Accumulated depreciation 1,302      
Overland Park, KS | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 0      
Initial cost of building and improvements 0      
Cost Capitalized Subsequent to Acquisition 31,146      
Carrying amount of land and land improvements 3,730      
Carrying amount of building and improvements 27,416      
Accumulated depreciation 9,937      
Overland Park, KS 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 4,500      
Initial cost of building and improvements 29,105      
Cost Capitalized Subsequent to Acquisition 7,295      
Carrying amount of land and land improvements 4,500      
Carrying amount of building and improvements 36,400      
Accumulated depreciation 12,683      
Overland Park, KS 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 410      
Initial cost of building and improvements 2,840      
Cost Capitalized Subsequent to Acquisition 98      
Carrying amount of land and land improvements 410      
Carrying amount of building and improvements 2,938      
Accumulated depreciation 663      
Overland Park, KS 3 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,300      
Initial cost of building and improvements 25,311      
Cost Capitalized Subsequent to Acquisition 677      
Carrying amount of land and land improvements 1,300      
Carrying amount of building and improvements 25,988      
Accumulated depreciation 5,293      
Owasso, OK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 215      
Initial cost of building and improvements 1,380      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 215      
Carrying amount of building and improvements 1,380      
Accumulated depreciation 930      
Palm Beach Gardens, FL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,082      
Initial cost of building and improvements 6,622      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,082      
Carrying amount of building and improvements 6,622      
Accumulated depreciation 893      
Palm Desert, CA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 6,195      
Initial cost of building and improvements 8,918      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 6,195      
Carrying amount of building and improvements 8,918      
Accumulated depreciation 1,091      
Palm Harbor, FL 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,306      
Initial cost of building and improvements 13,807      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,306      
Carrying amount of building and improvements 13,807      
Accumulated depreciation 1,753      
Palm Harbor, FL 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,490      
Initial cost of building and improvements 23,901      
Cost Capitalized Subsequent to Acquisition 125      
Carrying amount of land and land improvements 2,490      
Carrying amount of building and improvements 24,026      
Accumulated depreciation 1,520      
Palm Harbor, FL 3 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,281      
Initial cost of building and improvements 22,450      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 3,281      
Carrying amount of building and improvements 22,450      
Accumulated depreciation 2,797      
Palos Heights, IL 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,225      
Initial cost of building and improvements 12,453      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,225      
Carrying amount of building and improvements 12,453      
Accumulated depreciation 1,448      
Palos Heights, IL 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,431      
Initial cost of building and improvements 28,803      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 3,431      
Carrying amount of building and improvements 28,803      
Accumulated depreciation 3,236      
Palos Heights, IL 3 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,590      
Initial cost of building and improvements 7,644      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,590      
Carrying amount of building and improvements 7,644      
Accumulated depreciation 892      
Panama City Beach, FL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 900      
Initial cost of building and improvements 6,402      
Cost Capitalized Subsequent to Acquisition 734      
Carrying amount of land and land improvements 900      
Carrying amount of building and improvements 7,136      
Accumulated depreciation 1,917      
Paola, KS | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 190      
Initial cost of building and improvements 5,610      
Cost Capitalized Subsequent to Acquisition 63      
Carrying amount of land and land improvements 190      
Carrying amount of building and improvements 5,673      
Accumulated depreciation 1,137      
Parma, OH 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 960      
Initial cost of building and improvements 12,718      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 960      
Carrying amount of building and improvements 12,718      
Accumulated depreciation 1,585      
Parma, OH 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,833      
Initial cost of building and improvements 10,314      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,833      
Carrying amount of building and improvements 10,314      
Accumulated depreciation 1,447      
Paulsboro, NJ | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,264      
Initial cost of building and improvements 8,023      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 3,264      
Carrying amount of building and improvements 8,023      
Accumulated depreciation 1,012      
Paw Paw, MI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,687      
Initial cost of building and improvements 5,602      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,687      
Carrying amount of building and improvements 5,602      
Accumulated depreciation 669      
Perrysburg, OH 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,456      
Initial cost of building and improvements 5,431      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,456      
Carrying amount of building and improvements 5,431      
Accumulated depreciation 691      
Perrysburg, OH 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,213      
Initial cost of building and improvements 7,108      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,213      
Carrying amount of building and improvements 7,108      
Accumulated depreciation 838      
Philadelphia, PA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,930      
Initial cost of building and improvements 10,433      
Cost Capitalized Subsequent to Acquisition 3,536      
Carrying amount of land and land improvements 2,930      
Carrying amount of building and improvements 13,969      
Accumulated depreciation 4,977      
Pickerington, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,072      
Initial cost of building and improvements 27,651      
Cost Capitalized Subsequent to Acquisition 584      
Carrying amount of land and land improvements 2,072      
Carrying amount of building and improvements 28,235      
Accumulated depreciation 1,184      
Pikesville, MD 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 0      
Initial cost of building and improvements 2,487      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 0      
Carrying amount of building and improvements 2,487      
Accumulated depreciation 276      
Pikesville, MD 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 4,247      
Initial cost of building and improvements 8,379      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 4,247      
Carrying amount of building and improvements 8,379      
Accumulated depreciation 1,103      
Pinehurst, NC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 290      
Initial cost of building and improvements 2,690      
Cost Capitalized Subsequent to Acquisition 818      
Carrying amount of land and land improvements 290      
Carrying amount of building and improvements 3,508      
Accumulated depreciation 1,679      
Piqua, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 204      
Initial cost of building and improvements 1,885      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 204      
Carrying amount of building and improvements 1,885      
Accumulated depreciation 1,203      
Piscataway, NJ | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,100      
Initial cost of building and improvements 33,351      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 3,100      
Carrying amount of building and improvements 33,351      
Accumulated depreciation 5,201      
Pittsburgh, PA 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 603      
Initial cost of building and improvements 11,354      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 603      
Carrying amount of building and improvements 11,354      
Accumulated depreciation 1,407      
Pittsburgh, PA 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,005      
Initial cost of building and improvements 15,160      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,005      
Carrying amount of building and improvements 15,160      
Accumulated depreciation 1,808      
Pittsburgh, PA 3 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,140      
Initial cost of building and improvements 3,164      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,140      
Carrying amount of building and improvements 3,164      
Accumulated depreciation 381      
Pittsburgh, PA 4 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 761      
Initial cost of building and improvements 4,213      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 761      
Carrying amount of building and improvements 4,213      
Accumulated depreciation 486      
Pittsburgh, PA 5 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,480      
Initial cost of building and improvements 9,712      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,480      
Carrying amount of building and improvements 9,712      
Accumulated depreciation 1,308      
Pittsburgh, PA 6 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,139      
Initial cost of building and improvements 5,844      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,139      
Carrying amount of building and improvements 5,844      
Accumulated depreciation 771      
Pittsburgh, PA 7 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,750      
Initial cost of building and improvements 8,572      
Cost Capitalized Subsequent to Acquisition 6,320      
Carrying amount of land and land improvements 1,750      
Carrying amount of building and improvements 14,892      
Accumulated depreciation 4,782      
Plainview, NY | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,990      
Initial cost of building and improvements 11,969      
Cost Capitalized Subsequent to Acquisition 2,095      
Carrying amount of land and land improvements 3,990      
Carrying amount of building and improvements 14,064      
Accumulated depreciation 4,692      
Plano, TX | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,840      
Initial cost of building and improvements 20,152      
Cost Capitalized Subsequent to Acquisition 560      
Carrying amount of land and land improvements 1,840      
Carrying amount of building and improvements 20,712      
Accumulated depreciation 4,025      
Poole, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,111      
Initial cost of building and improvements 15,639      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 3,111      
Carrying amount of building and improvements 15,639      
Accumulated depreciation 1,641      
Potomac, MD 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,448      
Initial cost of building and improvements 14,622      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,448      
Carrying amount of building and improvements 14,622      
Accumulated depreciation 1,710      
Potomac, MD 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 4,119      
Initial cost of building and improvements 14,916      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 4,119      
Carrying amount of building and improvements 14,916      
Accumulated depreciation 1,803      
Pottstown, PA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 984      
Initial cost of building and improvements 4,563      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 984      
Carrying amount of building and improvements 4,563      
Accumulated depreciation 592      
Powell, OH 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,910      
Initial cost of building and improvements 18,008      
Cost Capitalized Subsequent to Acquisition 420      
Carrying amount of land and land improvements 1,910      
Carrying amount of building and improvements 18,428      
Accumulated depreciation 895      
Powell, OH 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,300      
Initial cost of building and improvements 26,198      
Cost Capitalized Subsequent to Acquisition 430      
Carrying amount of land and land improvements 2,300      
Carrying amount of building and improvements 26,628      
Accumulated depreciation 1,123      
Prior Lake, MN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 12,785      
Initial cost of land and land improvements 1,870      
Initial cost of building and improvements 29,849      
Cost Capitalized Subsequent to Acquisition 300      
Carrying amount of land and land improvements 1,870      
Carrying amount of building and improvements 30,149      
Accumulated depreciation 5,533      
Prospect, KY | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,533      
Initial cost of building and improvements 9,963      
Cost Capitalized Subsequent to Acquisition 176      
Carrying amount of land and land improvements 2,533      
Carrying amount of building and improvements 10,139      
Accumulated depreciation 790      
Raleigh, NC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 7,598      
Initial cost of building and improvements 88,870      
Cost Capitalized Subsequent to Acquisition 900      
Carrying amount of land and land improvements 7,598      
Carrying amount of building and improvements 89,770      
Accumulated depreciation 13,307      
Raleigh, NC 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,530      
Initial cost of building and improvements 59,589      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 3,530      
Carrying amount of building and improvements 59,589      
Accumulated depreciation 16,116      
Raleigh, NC 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,580      
Initial cost of building and improvements 16,837      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,580      
Carrying amount of building and improvements 16,837      
Accumulated depreciation 4,840      
Red Bank, NJ | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,050      
Initial cost of building and improvements 21,275      
Cost Capitalized Subsequent to Acquisition 1,403      
Carrying amount of land and land improvements 1,050      
Carrying amount of building and improvements 22,678      
Accumulated depreciation 6,726      
Redondo Beach, CA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 0      
Initial cost of building and improvements 9,557      
Cost Capitalized Subsequent to Acquisition 755      
Carrying amount of land and land improvements 0      
Carrying amount of building and improvements 10,312      
Accumulated depreciation 9,562      
Reidsville, NC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 170      
Initial cost of building and improvements 3,830      
Cost Capitalized Subsequent to Acquisition 1,473      
Carrying amount of land and land improvements 170      
Carrying amount of building and improvements 5,303      
Accumulated depreciation 2,485      
Richardson, TX | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,468      
Initial cost of building and improvements 12,975      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,468      
Carrying amount of building and improvements 12,975      
Accumulated depreciation 1,579      
Richmond, IN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 700      
Initial cost of building and improvements 14,222      
Cost Capitalized Subsequent to Acquisition 393      
Carrying amount of land and land improvements 700      
Carrying amount of building and improvements 14,615      
Accumulated depreciation 3,029      
Richmond, VA 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,261      
Initial cost of building and improvements 17,974      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 3,261      
Carrying amount of building and improvements 17,974      
Accumulated depreciation 2,079      
Richmond, VA 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,046      
Initial cost of building and improvements 8,233      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,046      
Carrying amount of building and improvements 8,233      
Accumulated depreciation 1,019      
Roanoke, VA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 748      
Initial cost of building and improvements 4,483      
Cost Capitalized Subsequent to Acquisition 5      
Carrying amount of land and land improvements 748      
Carrying amount of building and improvements 4,488      
Accumulated depreciation 1,560      
Rock Hill, SC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,825      
Initial cost of building and improvements 7,676      
Cost Capitalized Subsequent to Acquisition 190      
Carrying amount of land and land improvements 1,825      
Carrying amount of building and improvements 7,866      
Accumulated depreciation 718      
Rockford, MI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,386      
Initial cost of building and improvements 13,546      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,386      
Carrying amount of building and improvements 13,546      
Accumulated depreciation 1,104      
Rockville Centre, NY | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 4,290      
Initial cost of building and improvements 20,310      
Cost Capitalized Subsequent to Acquisition 1,429      
Carrying amount of land and land improvements 4,290      
Carrying amount of building and improvements 21,739      
Accumulated depreciation 6,882      
Romeoville, IL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,895      
Initial cost of building and improvements 0      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,895      
Carrying amount of building and improvements 0      
Accumulated depreciation 0      
Roseville, MN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,140      
Initial cost of building and improvements 24,679      
Cost Capitalized Subsequent to Acquisition 100      
Carrying amount of land and land improvements 2,140      
Carrying amount of building and improvements 24,779      
Accumulated depreciation 4,589      
Rugeley, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,860      
Initial cost of building and improvements 10,046      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,860      
Carrying amount of building and improvements 10,046      
Accumulated depreciation 2,640      
Ruston, LA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 710      
Initial cost of building and improvements 9,790      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 710      
Carrying amount of building and improvements 9,790      
Accumulated depreciation 3,299      
S Holland, IL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,423      
Initial cost of building and improvements 8,907      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,423      
Carrying amount of building and improvements 8,907      
Accumulated depreciation 1,109      
Salem, OR | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 449      
Initial cost of building and improvements 5,171      
Cost Capitalized Subsequent to Acquisition 1      
Carrying amount of land and land improvements 449      
Carrying amount of building and improvements 5,172      
Accumulated depreciation 3,192      
Salisbury, NC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 370      
Initial cost of building and improvements 5,697      
Cost Capitalized Subsequent to Acquisition 390      
Carrying amount of land and land improvements 370      
Carrying amount of building and improvements 6,087      
Accumulated depreciation 2,977      
San Angelo, TX 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 260      
Initial cost of building and improvements 8,800      
Cost Capitalized Subsequent to Acquisition 425      
Carrying amount of land and land improvements 260      
Carrying amount of building and improvements 9,225      
Accumulated depreciation 4,247      
San Angelo, TX 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,050      
Initial cost of building and improvements 24,689      
Cost Capitalized Subsequent to Acquisition 1,361      
Carrying amount of land and land improvements 1,050      
Carrying amount of building and improvements 26,050      
Accumulated depreciation 5,759      
San Antonio, TX | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,499      
Initial cost of building and improvements 12,658      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,499      
Carrying amount of building and improvements 12,658      
Accumulated depreciation 1,524      
San Diego, CA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 0      
Initial cost of building and improvements 22,003      
Cost Capitalized Subsequent to Acquisition 1,845      
Carrying amount of land and land improvements 0      
Carrying amount of building and improvements 23,848      
Accumulated depreciation 8,453      
San Juan Capistrano, CA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,390      
Initial cost of building and improvements 6,942      
Cost Capitalized Subsequent to Acquisition 1,524      
Carrying amount of land and land improvements 1,390      
Carrying amount of building and improvements 8,466      
Accumulated depreciation 4,634      
Sandusky, MI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 967      
Initial cost of building and improvements 6,738      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 967      
Carrying amount of building and improvements 6,738      
Accumulated depreciation 583      
Sarasota, FL 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 475      
Initial cost of building and improvements 3,175      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 475      
Carrying amount of building and improvements 3,175      
Accumulated depreciation 2,212      
Sarasota, FL 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 443      
Initial cost of building and improvements 8,892      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 443      
Carrying amount of building and improvements 8,892      
Accumulated depreciation 1,182      
Sarasota, FL 3 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 4,101      
Initial cost of building and improvements 11,204      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 4,101      
Carrying amount of building and improvements 11,204      
Accumulated depreciation 2,168      
Sarasota, FL 4 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,370      
Initial cost of building and improvements 4,082      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,370      
Carrying amount of building and improvements 4,082      
Accumulated depreciation 506      
Sarasota, FL 5 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,792      
Initial cost of building and improvements 11,173      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,792      
Carrying amount of building and improvements 11,173      
Accumulated depreciation 1,343      
Scranton, PA 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 440      
Initial cost of building and improvements 17,609      
Cost Capitalized Subsequent to Acquisition 570      
Carrying amount of land and land improvements 440      
Carrying amount of building and improvements 18,179      
Accumulated depreciation 4,021      
Scranton, PA 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 320      
Initial cost of building and improvements 12,144      
Cost Capitalized Subsequent to Acquisition 72      
Carrying amount of land and land improvements 320      
Carrying amount of building and improvements 12,216      
Accumulated depreciation 2,765      
Seminole, FL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,165      
Initial cost of building and improvements 8,975      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,165      
Carrying amount of building and improvements 8,975      
Accumulated depreciation 1,154      
Seven Fields, PA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 484      
Initial cost of building and improvements 4,663      
Cost Capitalized Subsequent to Acquisition 59      
Carrying amount of land and land improvements 484      
Carrying amount of building and improvements 4,722      
Accumulated depreciation 2,916      
Sewell, NJ | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,127      
Initial cost of building and improvements 14,090      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 3,127      
Carrying amount of building and improvements 14,090      
Accumulated depreciation 1,929      
Shawnee, OK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 80      
Initial cost of building and improvements 1,400      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 80      
Carrying amount of building and improvements 1,400      
Accumulated depreciation 969      
Silver Spring, MD 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,469      
Initial cost of building and improvements 10,392      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,469      
Carrying amount of building and improvements 10,392      
Accumulated depreciation 1,251      
Silver Spring, MD 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 4,678      
Initial cost of building and improvements 11,679      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 4,678      
Carrying amount of building and improvements 11,679      
Accumulated depreciation 1,499      
Silvis, IL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 880      
Initial cost of building and improvements 16,420      
Cost Capitalized Subsequent to Acquisition 139      
Carrying amount of land and land improvements 880      
Carrying amount of building and improvements 16,559      
Accumulated depreciation 5,454      
Sinking Spring, PA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,393      
Initial cost of building and improvements 19,842      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,393      
Carrying amount of building and improvements 19,842      
Accumulated depreciation 2,362      
Sittingbourne, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,328      
Initial cost of building and improvements 6,401      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,328      
Carrying amount of building and improvements 6,401      
Accumulated depreciation 1,341      
Smithfield, NC 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 290      
Initial cost of building and improvements 5,680      
Cost Capitalized Subsequent to Acquisition 844      
Carrying amount of land and land improvements 290      
Carrying amount of building and improvements 6,524      
Accumulated depreciation 2,901      
Smithfield, NC 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 360      
Initial cost of building and improvements 8,216      
Cost Capitalized Subsequent to Acquisition 209      
Carrying amount of land and land improvements 360      
Carrying amount of building and improvements 8,425      
Accumulated depreciation 1,861      
South Bend, IN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 670      
Initial cost of building and improvements 17,770      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 670      
Carrying amount of building and improvements 17,770      
Accumulated depreciation 4,225      
South Point, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,135      
Initial cost of building and improvements 9,387      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,135      
Carrying amount of building and improvements 9,387      
Accumulated depreciation 1,119      
Southampton, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,439      
Initial cost of building and improvements 15,189      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,439      
Carrying amount of building and improvements 15,189      
Accumulated depreciation 2,151      
Southbury, CT | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,860      
Initial cost of building and improvements 23,613      
Cost Capitalized Subsequent to Acquisition 3,421      
Carrying amount of land and land improvements 1,860      
Carrying amount of building and improvements 27,034      
Accumulated depreciation 7,504      
Spokane, WA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,649      
Initial cost of building and improvements 11,699      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,649      
Carrying amount of building and improvements 11,699      
Accumulated depreciation 1,410      
Springfield, IL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 990      
Initial cost of building and improvements 13,378      
Cost Capitalized Subsequent to Acquisition 1,085      
Carrying amount of land and land improvements 990      
Carrying amount of building and improvements 14,463      
Accumulated depreciation 3,361      
St. Paul, MN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,100      
Initial cost of building and improvements 33,019      
Cost Capitalized Subsequent to Acquisition 100      
Carrying amount of land and land improvements 2,100      
Carrying amount of building and improvements 33,119      
Accumulated depreciation 6,080      
Stafford, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,902      
Initial cost of building and improvements 7,801      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,902      
Carrying amount of building and improvements 7,801      
Accumulated depreciation 1,312      
Stamford, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,781      
Initial cost of building and improvements 3,170      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,781      
Carrying amount of building and improvements 3,170      
Accumulated depreciation 708      
Statesville, NC 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 150      
Initial cost of building and improvements 1,447      
Cost Capitalized Subsequent to Acquisition 377      
Carrying amount of land and land improvements 150      
Carrying amount of building and improvements 1,824      
Accumulated depreciation 905      
Statesville, NC 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 310      
Initial cost of building and improvements 6,183      
Cost Capitalized Subsequent to Acquisition 693      
Carrying amount of land and land improvements 310      
Carrying amount of building and improvements 6,876      
Accumulated depreciation 3,109      
Statesville, NC 3 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 140      
Initial cost of building and improvements 3,627      
Cost Capitalized Subsequent to Acquisition 56      
Carrying amount of land and land improvements 140      
Carrying amount of building and improvements 3,683      
Accumulated depreciation 1,849      
Staunton, VA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 899      
Initial cost of building and improvements 6,391      
Cost Capitalized Subsequent to Acquisition 6      
Carrying amount of land and land improvements 899      
Carrying amount of building and improvements 6,397      
Accumulated depreciation 1,877      
Sterling Heights, MI 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 790      
Initial cost of building and improvements 10,784      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 790      
Carrying amount of building and improvements 10,784      
Accumulated depreciation 1,308      
Sterling Heights, MI 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,583      
Initial cost of building and improvements 15,634      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,583      
Carrying amount of building and improvements 15,634      
Accumulated depreciation 1,925      
Stillwater, OK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 80      
Initial cost of building and improvements 1,400      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 80      
Carrying amount of building and improvements 1,400      
Accumulated depreciation 970      
Stratford-upon-Avon, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 773      
Initial cost of building and improvements 14,203      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 773      
Carrying amount of building and improvements 14,203      
Accumulated depreciation 2,823      
Stroudsburg, PA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 340      
Initial cost of building and improvements 16,313      
Cost Capitalized Subsequent to Acquisition 130      
Carrying amount of land and land improvements 340      
Carrying amount of building and improvements 16,443      
Accumulated depreciation 4,176      
Sunbury, PA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 695      
Initial cost of building and improvements 7,244      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 695      
Carrying amount of building and improvements 7,244      
Accumulated depreciation 844      
Sunnyvale, CA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 4,946      
Initial cost of building and improvements 22,123      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 4,946      
Carrying amount of building and improvements 22,123      
Accumulated depreciation 2,565      
Superior, WI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,020      
Initial cost of building and improvements 13,735      
Cost Capitalized Subsequent to Acquisition 6,159      
Carrying amount of land and land improvements 1,020      
Carrying amount of building and improvements 19,894      
Accumulated depreciation 5,104      
Tacoma, WA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,522      
Initial cost of building and improvements 8,573      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,522      
Carrying amount of building and improvements 8,573      
Accumulated depreciation 1,016      
Tallahassee, FL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,264      
Initial cost of building and improvements 9,652      
Cost Capitalized Subsequent to Acquisition 55      
Carrying amount of land and land improvements 1,264      
Carrying amount of building and improvements 9,707      
Accumulated depreciation 740      
Tampa, FL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,315      
Initial cost of building and improvements 6,911      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,315      
Carrying amount of building and improvements 6,911      
Accumulated depreciation 967      
Telford, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 937      
Initial cost of building and improvements 10,114      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 937      
Carrying amount of building and improvements 10,114      
Accumulated depreciation 380      
Terre Haute, IN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,370      
Initial cost of building and improvements 18,016      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,370      
Carrying amount of building and improvements 18,016      
Accumulated depreciation 4,046      
Texarkana, TX | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 192      
Initial cost of building and improvements 1,403      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 192      
Carrying amount of building and improvements 1,403      
Accumulated depreciation 945      
The Villages, FL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,035      
Initial cost of building and improvements 7,446      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,035      
Carrying amount of building and improvements 7,446      
Accumulated depreciation 2,001      
Thomasville, GA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 530      
Initial cost of building and improvements 12,520      
Cost Capitalized Subsequent to Acquisition 1,347      
Carrying amount of land and land improvements 530      
Carrying amount of building and improvements 13,867      
Accumulated depreciation 3,502      
Thousand Oaks, CA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,425      
Initial cost of building and improvements 19,573      
Cost Capitalized Subsequent to Acquisition 6      
Carrying amount of land and land improvements 3,425      
Carrying amount of building and improvements 19,579      
Accumulated depreciation 1,347      
Three Rivers, MI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,255      
Initial cost of building and improvements 2,760      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,255      
Carrying amount of building and improvements 2,760      
Accumulated depreciation 439      
Tomball, TX | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,050      
Initial cost of building and improvements 13,300      
Cost Capitalized Subsequent to Acquisition 840      
Carrying amount of land and land improvements 1,050      
Carrying amount of building and improvements 14,140      
Accumulated depreciation 4,272      
Toms River, NJ | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,466      
Initial cost of building and improvements 23,311      
Cost Capitalized Subsequent to Acquisition 69      
Carrying amount of land and land improvements 3,466      
Carrying amount of building and improvements 23,380      
Accumulated depreciation 3,279      
Tonganoxie, KS | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 310      
Initial cost of building and improvements 3,690      
Cost Capitalized Subsequent to Acquisition 81      
Carrying amount of land and land improvements 310      
Carrying amount of building and improvements 3,771      
Accumulated depreciation 835      
Towson, MD 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,715      
Initial cost of building and improvements 13,111      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,715      
Carrying amount of building and improvements 13,111      
Accumulated depreciation 1,577      
Towson, MD 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,100      
Initial cost of building and improvements 6,465      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 3,100      
Carrying amount of building and improvements 6,465      
Accumulated depreciation 743      
Towson, MD 3 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 4,527      
Initial cost of building and improvements 3,126      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 4,527      
Carrying amount of building and improvements 3,126      
Accumulated depreciation 454      
Troy, MI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,381      
Initial cost of building and improvements 24,445      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,381      
Carrying amount of building and improvements 24,445      
Accumulated depreciation 2,812      
Troy, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 200      
Initial cost of building and improvements 2,000      
Cost Capitalized Subsequent to Acquisition 4,254      
Carrying amount of land and land improvements 200      
Carrying amount of building and improvements 6,254      
Accumulated depreciation 2,834      
Trumbull, CT | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 4,440      
Initial cost of building and improvements 43,384      
Cost Capitalized Subsequent to Acquisition 6,799      
Carrying amount of land and land improvements 4,440      
Carrying amount of building and improvements 50,183      
Accumulated depreciation 13,509      
Tulsa, OK 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,390      
Initial cost of building and improvements 7,110      
Cost Capitalized Subsequent to Acquisition 1,102      
Carrying amount of land and land improvements 1,390      
Carrying amount of building and improvements 8,212      
Accumulated depreciation 3,065      
Tulsa, OK 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,100      
Initial cost of building and improvements 27,007      
Cost Capitalized Subsequent to Acquisition 2,233      
Carrying amount of land and land improvements 1,100      
Carrying amount of building and improvements 29,240      
Accumulated depreciation 4,881      
Tulsa, OK 3 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 890      
Initial cost of building and improvements 9,410      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 890      
Carrying amount of building and improvements 9,410      
Accumulated depreciation 1,365      
Tustin, CA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 840      
Initial cost of building and improvements 15,299      
Cost Capitalized Subsequent to Acquisition 573      
Carrying amount of land and land improvements 840      
Carrying amount of building and improvements 15,872      
Accumulated depreciation 5,373      
Twinsburg, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,446      
Initial cost of building and improvements 5,919      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,446      
Carrying amount of building and improvements 5,919      
Accumulated depreciation 788      
Union, KY | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 0      
Initial cost of building and improvements 0      
Cost Capitalized Subsequent to Acquisition 33,927      
Carrying amount of land and land improvements 2,242      
Carrying amount of building and improvements 31,685      
Accumulated depreciation 2,489      
Union, SC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,932      
Initial cost of building and improvements 2,372      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,932      
Carrying amount of building and improvements 2,372      
Accumulated depreciation 440      
Valparaiso, IN 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 112      
Initial cost of building and improvements 2,558      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 112      
Carrying amount of building and improvements 2,558      
Accumulated depreciation 1,446      
Valparaiso, IN 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 108      
Initial cost of building and improvements 2,962      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 108      
Carrying amount of building and improvements 2,962      
Accumulated depreciation 1,660      
Vancouver, WA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,503      
Initial cost of building and improvements 28,393      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,503      
Carrying amount of building and improvements 28,393      
Accumulated depreciation 3,238      
Venice, FL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,246      
Initial cost of building and improvements 10,094      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,246      
Carrying amount of building and improvements 10,094      
Accumulated depreciation 1,293      
Vero Beach, FL 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 263      
Initial cost of building and improvements 3,187      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 263      
Carrying amount of building and improvements 3,187      
Accumulated depreciation 1,778      
Vero Beach, FL 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 297      
Initial cost of building and improvements 3,263      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 297      
Carrying amount of building and improvements 3,263      
Accumulated depreciation 1,828      
Vero Beach, FL 3 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,256      
Initial cost of building and improvements 11,204      
Cost Capitalized Subsequent to Acquisition 187      
Carrying amount of land and land improvements 1,256      
Carrying amount of building and improvements 11,391      
Accumulated depreciation 843      
Vero Beach, FL 4 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,580      
Initial cost of building and improvements 31,735      
Cost Capitalized Subsequent to Acquisition 1,331      
Carrying amount of land and land improvements 3,580      
Carrying amount of building and improvements 33,066      
Accumulated depreciation 2,100      
Virginia Beach, VA 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,540      
Initial cost of building and improvements 22,593      
Cost Capitalized Subsequent to Acquisition 399      
Carrying amount of land and land improvements 1,540      
Carrying amount of building and improvements 22,992      
Accumulated depreciation 5,159      
Virginia Beach, VA 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,004      
Initial cost of building and improvements 19,634      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,004      
Carrying amount of building and improvements 19,634      
Accumulated depreciation 891      
Voorhees, NJ 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,100      
Initial cost of building and improvements 25,950      
Cost Capitalized Subsequent to Acquisition 26      
Carrying amount of land and land improvements 3,100      
Carrying amount of building and improvements 25,976      
Accumulated depreciation 7,527      
Voorhees, NJ 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,193      
Initial cost of building and improvements 6,990      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,193      
Carrying amount of building and improvements 6,990      
Accumulated depreciation 932      
W Palm Beach, FL 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,175      
Initial cost of building and improvements 8,294      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,175      
Carrying amount of building and improvements 8,294      
Accumulated depreciation 1,084      
W Palm Beach, FL 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,921      
Initial cost of building and improvements 5,731      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,921      
Carrying amount of building and improvements 5,731      
Accumulated depreciation 723      
Wabash, IN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 670      
Initial cost of building and improvements 14,588      
Cost Capitalized Subsequent to Acquisition 1      
Carrying amount of land and land improvements 670      
Carrying amount of building and improvements 14,589      
Accumulated depreciation 3,599      
Waconia, MN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 890      
Initial cost of building and improvements 14,726      
Cost Capitalized Subsequent to Acquisition 4,495      
Carrying amount of land and land improvements 890      
Carrying amount of building and improvements 19,221      
Accumulated depreciation 5,606      
Wake Forest, NC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 200      
Initial cost of building and improvements 3,003      
Cost Capitalized Subsequent to Acquisition 2,625      
Carrying amount of land and land improvements 200      
Carrying amount of building and improvements 5,628      
Accumulated depreciation 2,754      
Wallingford, PA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,356      
Initial cost of building and improvements 6,487      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,356      
Carrying amount of building and improvements 6,487      
Accumulated depreciation 881      
Walnut Creek, CA 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 4,358      
Initial cost of building and improvements 18,407      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 4,358      
Carrying amount of building and improvements 18,407      
Accumulated depreciation 2,190      
Walnut Creek, CA 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 5,394      
Initial cost of building and improvements 39,084      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 5,394      
Carrying amount of building and improvements 39,084      
Accumulated depreciation 4,420      
Walsall, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 0      
Initial cost of building and improvements 0      
Cost Capitalized Subsequent to Acquisition 9,540      
Carrying amount of land and land improvements 1,159      
Carrying amount of building and improvements 8,381      
Accumulated depreciation 1,765      
Wamego, KS | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 40      
Initial cost of building and improvements 2,510      
Cost Capitalized Subsequent to Acquisition 61      
Carrying amount of land and land improvements 40      
Carrying amount of building and improvements 2,571      
Accumulated depreciation 524      
Warren, NJ | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,000      
Initial cost of building and improvements 30,810      
Cost Capitalized Subsequent to Acquisition 1,521      
Carrying amount of land and land improvements 2,000      
Carrying amount of building and improvements 32,331      
Accumulated depreciation 9,589      
Waterloo, IA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 605      
Initial cost of building and improvements 3,030      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 605      
Carrying amount of building and improvements 3,030      
Accumulated depreciation 398      
Wayne, NJ | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,427      
Initial cost of building and improvements 15,674      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,427      
Carrying amount of building and improvements 15,674      
Accumulated depreciation 2,370      
Wellingborough, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,449      
Initial cost of building and improvements 5,603      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,449      
Carrying amount of building and improvements 5,603      
Accumulated depreciation 1,304      
West Bend, WI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 620      
Initial cost of building and improvements 17,790      
Cost Capitalized Subsequent to Acquisition 38      
Carrying amount of land and land improvements 620      
Carrying amount of building and improvements 17,828      
Accumulated depreciation 5,204      
West Des Moines, IA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 828      
Initial cost of building and improvements 5,103      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 828      
Carrying amount of building and improvements 5,103      
Accumulated depreciation 678      
West Milford, NJ | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,960      
Initial cost of building and improvements 24,614      
Cost Capitalized Subsequent to Acquisition 273      
Carrying amount of land and land improvements 1,960      
Carrying amount of building and improvements 24,887      
Accumulated depreciation 3,164      
West Orange, NJ | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,347      
Initial cost of building and improvements 19,389      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,347      
Carrying amount of building and improvements 19,389      
Accumulated depreciation 2,746      
West Reading, PA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 890      
Initial cost of building and improvements 12,118      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 890      
Carrying amount of building and improvements 12,118      
Accumulated depreciation 1,364      
Westerville, OH 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 740      
Initial cost of building and improvements 8,287      
Cost Capitalized Subsequent to Acquisition 4,871      
Carrying amount of land and land improvements 740      
Carrying amount of building and improvements 13,158      
Accumulated depreciation 11,246      
Westerville, OH 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 0      
Initial cost of building and improvements 0      
Cost Capitalized Subsequent to Acquisition 26,086      
Carrying amount of land and land improvements 2,566      
Carrying amount of building and improvements 23,520      
Accumulated depreciation 1,766      
Westerville, OH 3 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,420      
Initial cost of building and improvements 5,371      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,420      
Carrying amount of building and improvements 5,371      
Accumulated depreciation 673      
Westerville, OH 4 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,582      
Initial cost of building and improvements 10,279      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,582      
Carrying amount of building and improvements 10,279      
Accumulated depreciation 1,310      
Westfield, IN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 890      
Initial cost of building and improvements 15,964      
Cost Capitalized Subsequent to Acquisition 1      
Carrying amount of land and land improvements 890      
Carrying amount of building and improvements 15,965      
Accumulated depreciation 3,909      
Westlake, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 855      
Initial cost of building and improvements 11,963      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 855      
Carrying amount of building and improvements 11,963      
Accumulated depreciation 1,467      
Weston Super Mare, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,464      
Initial cost of building and improvements 6,906      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,464      
Carrying amount of building and improvements 6,906      
Accumulated depreciation 1,723      
Wheaton, MD | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,864      
Initial cost of building and improvements 3,788      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 3,864      
Carrying amount of building and improvements 3,788      
Accumulated depreciation 493      
Whippany, NJ | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,571      
Initial cost of building and improvements 14,977      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,571      
Carrying amount of building and improvements 14,977      
Accumulated depreciation 1,847      
Whitehall, MI | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,645      
Initial cost of building and improvements 6,789      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,645      
Carrying amount of building and improvements 6,789      
Accumulated depreciation 697      
Wichita, KS 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 860      
Initial cost of building and improvements 8,873      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 860      
Carrying amount of building and improvements 8,873      
Accumulated depreciation 2,856      
Wichita, KS 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 260      
Initial cost of building and improvements 2,240      
Cost Capitalized Subsequent to Acquisition 137      
Carrying amount of land and land improvements 260      
Carrying amount of building and improvements 2,377      
Accumulated depreciation 491      
Williamsburg, VA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,187      
Initial cost of building and improvements 5,728      
Cost Capitalized Subsequent to Acquisition 6      
Carrying amount of land and land improvements 1,187      
Carrying amount of building and improvements 5,734      
Accumulated depreciation 1,765      
Willoughby, OH | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,774      
Initial cost of building and improvements 8,653      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,774      
Carrying amount of building and improvements 8,653      
Accumulated depreciation 1,079      
Wilmington, DE 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,376      
Initial cost of building and improvements 13,450      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,376      
Carrying amount of building and improvements 13,450      
Accumulated depreciation 1,625      
Wilmington, NC 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 210      
Initial cost of building and improvements 2,991      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 210      
Carrying amount of building and improvements 2,991      
Accumulated depreciation 1,842      
Wilmington, NC 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 400      
Initial cost of building and improvements 15,355      
Cost Capitalized Subsequent to Acquisition 579      
Carrying amount of land and land improvements 400      
Carrying amount of building and improvements 15,934      
Accumulated depreciation 3,668      
Wilmington, DE 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,843      
Initial cost of building and improvements 36,948      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,843      
Carrying amount of building and improvements 36,948      
Accumulated depreciation 4,292      
Wilmington, DE 3 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,266      
Initial cost of building and improvements 9,500      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,266      
Carrying amount of building and improvements 9,500      
Accumulated depreciation 1,179      
Windsor, VA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,148      
Initial cost of building and improvements 6,514      
Cost Capitalized Subsequent to Acquisition 7      
Carrying amount of land and land improvements 1,148      
Carrying amount of building and improvements 6,521      
Accumulated depreciation 1,988      
Winston-Salem, NC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 360      
Initial cost of building and improvements 2,514      
Cost Capitalized Subsequent to Acquisition 595      
Carrying amount of land and land improvements 360      
Carrying amount of building and improvements 3,109      
Accumulated depreciation 1,543      
Winter Garden, FL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,110      
Initial cost of building and improvements 7,937      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,110      
Carrying amount of building and improvements 7,937      
Accumulated depreciation 2,329      
Winter Springs, FL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,152      
Initial cost of building and improvements 14,822      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,152      
Carrying amount of building and improvements 14,822      
Accumulated depreciation 1,771      
Witherwack, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 924      
Initial cost of building and improvements 6,769      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 924      
Carrying amount of building and improvements 6,769      
Accumulated depreciation 1,690      
Wolverhampton, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,540      
Initial cost of building and improvements 6,537      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,540      
Carrying amount of building and improvements 6,537      
Accumulated depreciation 1,646      
Woodbury, MN | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,317      
Initial cost of building and improvements 20,935      
Cost Capitalized Subsequent to Acquisition 298      
Carrying amount of land and land improvements 1,317      
Carrying amount of building and improvements 21,233      
Accumulated depreciation 3,499      
Woodstock, VA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 594      
Initial cost of building and improvements 5,108      
Cost Capitalized Subsequent to Acquisition 5      
Carrying amount of land and land improvements 594      
Carrying amount of building and improvements 5,113      
Accumulated depreciation 1,363      
Worcester, MA | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 3,500      
Initial cost of building and improvements 54,099      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 3,500      
Carrying amount of building and improvements 54,099      
Accumulated depreciation 18,693      
Yardley, PA 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 773      
Initial cost of building and improvements 14,914      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 773      
Carrying amount of building and improvements 14,914      
Accumulated depreciation 1,885      
Yardley, PA 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,561      
Initial cost of building and improvements 9,439      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,561      
Carrying amount of building and improvements 9,439      
Accumulated depreciation 1,420      
York, PA 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 976      
Initial cost of building and improvements 9,354      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 976      
Carrying amount of building and improvements 9,354      
Accumulated depreciation 1,149      
York, PA 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,050      
Initial cost of building and improvements 4,210      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,050      
Carrying amount of building and improvements 4,210      
Accumulated depreciation 612      
York, PA 3 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,121      
Initial cost of building and improvements 7,584      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,121      
Carrying amount of building and improvements 7,584      
Accumulated depreciation 996      
York, UK | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,898      
Initial cost of building and improvements 8,092      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,898      
Carrying amount of building and improvements 8,092      
Accumulated depreciation 1,773      
Youngsville, NC | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 380      
Initial cost of building and improvements 10,689      
Cost Capitalized Subsequent to Acquisition 135      
Carrying amount of land and land improvements 380      
Carrying amount of building and improvements 10,824      
Accumulated depreciation 2,486      
Zephyrhills, FL | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,131      
Initial cost of building and improvements 6,669      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 2,131      
Carrying amount of building and improvements 6,669      
Accumulated depreciation 920      
Zionsville, IN 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,610      
Initial cost of building and improvements 22,400      
Cost Capitalized Subsequent to Acquisition 2,055      
Carrying amount of land and land improvements 1,610      
Carrying amount of building and improvements 24,455      
Accumulated depreciation 7,661      
Zionsville, IN 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 2,162      
Initial cost of building and improvements 33,238      
Cost Capitalized Subsequent to Acquisition 310      
Carrying amount of land and land improvements 2,165      
Carrying amount of building and improvements 33,545      
Accumulated depreciation 1,797      
Newcastle Under Lyme, UK 1 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,087      
Initial cost of building and improvements 5,536      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,087      
Carrying amount of building and improvements 5,536      
Accumulated depreciation 1,373      
Newcastle Under Lyme, UK 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,101      
Initial cost of building and improvements 5,420      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,101      
Carrying amount of building and improvements 5,420      
Accumulated depreciation 1,182      
Bethlehem, PA 2 | Triple-net        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Initial cost of encumbrances 0      
Initial cost of land and land improvements 1,143      
Initial cost of building and improvements 13,588      
Cost Capitalized Subsequent to Acquisition 0      
Carrying amount of land and land improvements 1,143      
Carrying amount of building and improvements 13,588      
Accumulated depreciation $ 1,552