Annual report pursuant to Section 13 and 15(d)

Schedule III - Real Estate and Accumulated Depreciation (Detail)

v3.10.0.1
Schedule III - Real Estate and Accumulated Depreciation (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2014
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 445,710      
Land, initial cost 127,763      
Buildings & improvements, initial cost 763,731      
Improvement costs capitalized subsequent to acquisition 58,328      
Land, total cost 127,982      
Buildings & improvements, total cost 821,840      
Total 949,822 $ 906,850 $ 833,203 $ 782,276
Accumulated depreciation 178,475 $ 153,387 $ 134,329 $ 113,089
Net real estate 771,347      
Raleigh, North Carolina Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost 0      
Land, initial cost 960      
Buildings & improvements, initial cost 4,481      
Improvement costs capitalized subsequent to acquisition 35      
Land, total cost 960      
Buildings & improvements, total cost 4,516      
Total 5,476      
Accumulated depreciation 2,197      
Net real estate $ 3,279      
Year construction/ improvements 1997      
Date acquired Dec. 23, 2003      
Canton, Ohio Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 1,521      
Land, initial cost 186      
Buildings & improvements, initial cost 3,083      
Improvement costs capitalized subsequent to acquisition 500      
Land, total cost 187      
Buildings & improvements, total cost 3,582      
Total 3,769      
Accumulated depreciation 1,442      
Net real estate $ 2,327      
Year construction/ improvements 1994      
Date acquired Jan. 30, 2004      
Akron, Ohio Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 1,973      
Buildings & improvements, initial cost 6,771      
Improvement costs capitalized subsequent to acquisition 2,248      
Land, total cost 1,974      
Buildings & improvements, total cost 9,018      
Total 10,992      
Accumulated depreciation 2,934      
Net real estate $ 8,058      
Year construction/ improvements 1968      
Year construction/improvements one 1999      
Date acquired Apr. 29, 2004      
Charlotte, North Carolina Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 740      
Buildings & improvements, initial cost 8,423      
Improvement costs capitalized subsequent to acquisition 61      
Land, total cost 741      
Buildings & improvements, total cost 8,483      
Total 9,224      
Accumulated depreciation 3,203      
Net real estate $ 6,021      
Year construction/ improvements 1984      
Year construction/improvements one 1995      
Date acquired Jun. 30, 2004      
Canton, North Carolina Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 3,322      
Land, initial cost 150      
Buildings & improvements, initial cost 5,050      
Improvement costs capitalized subsequent to acquisition 7,285      
Land, total cost 150      
Buildings & improvements, total cost 12,335      
Total 12,485      
Accumulated depreciation 2,665      
Net real estate $ 9,820      
Year construction/ improvements 1998      
Year construction/improvements one 2014      
Date acquired Jul. 06, 2004      
Crenshaw, Pennsylvania Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 3,881      
Land, initial cost 100      
Buildings & improvements, initial cost 6,574      
Improvement costs capitalized subsequent to acquisition 269      
Land, total cost 100      
Buildings & improvements, total cost 6,843      
Total 6,943      
Accumulated depreciation 2,549      
Net real estate $ 4,394      
Year construction/ improvements 1991      
Date acquired Aug. 05, 2004      
Lexington, North Carolina Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 2,261      
Land, initial cost 820      
Buildings & improvements, initial cost 2,107      
Improvement costs capitalized subsequent to acquisition 69      
Land, total cost 820      
Buildings & improvements, total cost 2,176      
Total 2,996      
Accumulated depreciation 841      
Net real estate $ 2,155      
Year construction/ improvements 1986      
Date acquired Aug. 05, 2004      
Austin, Texas Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 1,000      
Buildings & improvements, initial cost 6,296      
Improvement costs capitalized subsequent to acquisition 699      
Land, total cost 1,000      
Buildings & improvements, total cost 6,995      
Total 7,995      
Accumulated depreciation 2,472      
Net real estate $ 5,523      
Year construction/ improvements 2001      
Date acquired Sep. 16, 2004      
Mt. Pocono, Pennsylvania Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 350      
Buildings & improvements, initial cost 5,819      
Improvement costs capitalized subsequent to acquisition 18      
Land, total cost 350      
Buildings & improvements, total cost 5,837      
Total 6,187      
Accumulated depreciation 2,159      
Net real estate $ 4,028      
Year construction/ improvements 1995      
Year construction/improvements one 1999      
Date acquired Oct. 15, 2004      
San Antonio, Texas Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 843      
Buildings & improvements, initial cost 7,514      
Improvement costs capitalized subsequent to acquisition 1,378      
Land, total cost 843      
Buildings & improvements, total cost 8,892      
Total 9,735      
Accumulated depreciation 3,295      
Net real estate $ 6,440      
Year construction/ improvements 1999      
Date acquired Feb. 10, 2005      
Big Flats, New York Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 2,181      
Land, initial cost 275      
Buildings & improvements, initial cost 6,459      
Improvement costs capitalized subsequent to acquisition 34      
Land, total cost 275      
Buildings & improvements, total cost 6,493      
Total 6,768      
Accumulated depreciation 2,289      
Net real estate $ 4,479      
Year construction/ improvements 2001      
Date acquired Apr. 15, 2005      
Wichita, Kansas Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 1,525      
Buildings & improvements, initial cost 9,703      
Improvement costs capitalized subsequent to acquisition 327      
Land, total cost 1,525      
Buildings & improvements, total cost 10,030      
Total 11,555      
Accumulated depreciation 3,514      
Net real estate $ 8,041      
Year construction/ improvements 2000      
Date acquired May 18, 2005      
Eatontown, New Jersey Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 2,739      
Land, initial cost 1,351      
Buildings & improvements, initial cost 3,520      
Improvement costs capitalized subsequent to acquisition 534      
Land, total cost 1,351      
Buildings & improvements, total cost 4,054      
Total 5,405      
Accumulated depreciation 1,471      
Net real estate $ 3,934      
Year construction/ improvements 1991      
Date acquired Jul. 07, 2005      
Duncan, South Carolina Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 8,945      
Land, initial cost 783      
Buildings & improvements, initial cost 10,790      
Improvement costs capitalized subsequent to acquisition 1,722      
Land, total cost 783      
Buildings & improvements, total cost 12,512      
Total 13,295      
Accumulated depreciation 4,259      
Net real estate $ 9,036      
Year construction/ improvements 1984      
Year construction/improvements one 2001      
Year construction/improvements two 2007      
Date acquired Jul. 14, 2005      
Duncan, South Carolina Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 2,223      
Land, initial cost 195      
Buildings & improvements, initial cost 2,682      
Improvement costs capitalized subsequent to acquisition 428      
Land, total cost 195      
Buildings & improvements, total cost 3,110      
Total 3,305      
Accumulated depreciation 1,059      
Net real estate $ 2,246      
Year construction/ improvements 1984      
Year construction/improvements one 2001      
Year construction/improvements two 2007      
Date acquired Jul. 14, 2005      
Clintonville, Wisconsin Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 55      
Buildings & improvements, initial cost 4,717      
Improvement costs capitalized subsequent to acquisition 3,250      
Land, total cost 55      
Buildings & improvements, total cost 7,967      
Total 8,022      
Accumulated depreciation 2,215      
Net real estate $ 5,807      
Year construction/ improvements 1992      
Year construction/improvements one 2013      
Date acquired Oct. 31, 2005      
Maple Heights, Ohio Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 4,000      
Land, initial cost 1,609      
Buildings & improvements, initial cost 10,065      
Improvement costs capitalized subsequent to acquisition 1,500      
Land, total cost 1,609      
Buildings & improvements, total cost 11,565      
Total 13,174      
Accumulated depreciation 4,812      
Net real estate $ 8,362      
Year construction/ improvements 1974      
Date acquired Dec. 21, 2005      
Richmond, Virginia Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 736      
Buildings & improvements, initial cost 5,336      
Improvement costs capitalized subsequent to acquisition 440      
Land, total cost 736      
Buildings & improvements, total cost 5,776      
Total 6,512      
Accumulated depreciation 1,836      
Net real estate $ 4,676      
Year construction/ improvements 1972      
Date acquired Dec. 30, 2005      
Champaign, Illinois Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 1,478      
Land, initial cost 687      
Buildings & improvements, initial cost 2,036      
Improvement costs capitalized subsequent to acquisition 2      
Land, total cost 687      
Buildings & improvements, total cost 2,038      
Total 2,725      
Accumulated depreciation 700      
Net real estate $ 2,025      
Year construction/ improvements 1996      
Date acquired Feb. 21, 2006      
Champaign, Illinois Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 2,897      
Land, initial cost 1,347      
Buildings & improvements, initial cost 3,992      
Improvement costs capitalized subsequent to acquisition 4      
Land, total cost 1,347      
Buildings & improvements, total cost 3,996      
Total 5,343      
Accumulated depreciation 1,373      
Net real estate $ 3,970      
Year construction/ improvements 1996      
Date acquired Feb. 21, 2006      
Champaign, Illinois Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 1,811      
Land, initial cost 842      
Buildings & improvements, initial cost 2,495      
Improvement costs capitalized subsequent to acquisition 2      
Land, total cost 842      
Buildings & improvements, total cost 2,497      
Total 3,339      
Accumulated depreciation 858      
Net real estate $ 2,481      
Year construction/ improvements 1996      
Date acquired Feb. 21, 2006      
Champaign, Illinois Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 1,655      
Land, initial cost 770      
Buildings & improvements, initial cost 2,281      
Improvement costs capitalized subsequent to acquisition 2      
Land, total cost 770      
Buildings & improvements, total cost 2,283      
Total 3,053      
Accumulated depreciation 784      
Net real estate $ 2,269      
Year construction/ improvements 1996      
Date acquired Feb. 21, 2006      
Burnsville, Minnesota Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 8,340      
Land, initial cost 3,511      
Buildings & improvements, initial cost 8,746      
Improvement costs capitalized subsequent to acquisition 6,693      
Land, total cost 3,511      
Buildings & improvements, total cost 15,439      
Total 18,950      
Accumulated depreciation 5,062      
Net real estate $ 13,888      
Year construction/ improvements 1984      
Date acquired May 10, 2006      
Menomonee Falls, Wisconsin Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 625      
Buildings & improvements, initial cost 6,911      
Improvement costs capitalized subsequent to acquisition 686      
Land, total cost 625      
Buildings & improvements, total cost 7,597      
Total 8,222      
Accumulated depreciation 2,416      
Net real estate $ 5,806      
Year construction/ improvements 1986      
Year construction/improvements one 2000      
Date acquired Jun. 30, 2006      
Baytown, Texas Medical Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 221      
Buildings & improvements, initial cost 2,443      
Improvement costs capitalized subsequent to acquisition 2,478      
Land, total cost 221      
Buildings & improvements, total cost 4,921      
Total 5,142      
Accumulated depreciation 1,290      
Net real estate $ 3,852      
Year construction/ improvements 1997      
Date acquired Jul. 11, 2006      
Mason, Ohio Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 3,813      
Land, initial cost 797      
Buildings & improvements, initial cost 6,258      
Improvement costs capitalized subsequent to acquisition 540      
Land, total cost 797      
Buildings & improvements, total cost 6,798      
Total 7,595      
Accumulated depreciation 2,381      
Net real estate $ 5,214      
Year construction/ improvements 2002      
Date acquired Jan. 05, 2007      
Raleigh, North Carolina Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 1,606      
Buildings & improvements, initial cost 5,513      
Improvement costs capitalized subsequent to acquisition 3,749      
Land, total cost 1,606      
Buildings & improvements, total cost 9,262      
Total 10,868      
Accumulated depreciation 2,621      
Net real estate $ 8,247      
Year construction/ improvements 1994      
Date acquired Feb. 16, 2007      
Tulsa, Oklahoma Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 6,598      
Land, initial cost 0      
Buildings & improvements, initial cost 14,057      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 0      
Buildings & improvements, total cost 14,057      
Total 14,057      
Accumulated depreciation 5,005      
Net real estate $ 9,052      
Year construction/ improvements 2004      
Date acquired Mar. 01, 2007      
Hialeah, Florida Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 3,562      
Buildings & improvements, initial cost 6,672      
Improvement costs capitalized subsequent to acquisition 769      
Land, total cost 3,562      
Buildings & improvements, total cost 7,441      
Total 11,003      
Accumulated depreciation 2,270      
Net real estate $ 8,733      
Year construction/ improvements 1956      
Year construction/improvements one 1992      
Date acquired Mar. 09, 2007      
Tewksbury, Massachusetts Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Year construction/ improvements 1985      
Year construction/improvements one 1989      
Mason, Ohio Retail Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 1,201      
Buildings & improvements, initial cost 4,961      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 1,201      
Buildings & improvements, total cost 4,961      
Total 6,162      
Accumulated depreciation 1,489      
Net real estate $ 4,673      
Year construction/ improvements 2007      
Date acquired Jul. 01, 2007      
Cicero, New York Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 3,363      
Land, initial cost 299      
Buildings & improvements, initial cost 5,019      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 299      
Buildings & improvements, total cost 5,019      
Total 5,318      
Accumulated depreciation 1,457      
Net real estate $ 3,861      
Year construction/ improvements 2005      
Date acquired Sep. 06, 2007      
Grand Rapids, Michigan Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 5,232      
Land, initial cost 1,629      
Buildings & improvements, initial cost 10,500      
Improvement costs capitalized subsequent to acquisition 308      
Land, total cost 1,629      
Buildings & improvements, total cost 10,808      
Total 12,437      
Accumulated depreciation 3,215      
Net real estate $ 9,222      
Year construction/ improvements 2001      
Date acquired Sep. 28, 2007      
Bollingbrook, Illinois Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 1,272      
Buildings & improvements, initial cost 5,003      
Improvement costs capitalized subsequent to acquisition 856      
Land, total cost 1,272      
Buildings & improvements, total cost 5,859      
Total 7,131      
Accumulated depreciation 1,814      
Net real estate $ 5,317      
Year construction/ improvements 2002      
Date acquired Sep. 28, 2007      
Decatur, Georgia Medical Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 783      
Buildings & improvements, initial cost 3,241      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 783      
Buildings & improvements, total cost 3,241      
Total 4,024      
Accumulated depreciation 966      
Net real estate $ 3,058      
Year construction/ improvements 1989      
Date acquired Dec. 13, 2007      
Decatur, Georgia Medical Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 205      
Buildings & improvements, initial cost 847      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 205      
Buildings & improvements, total cost 847      
Total 1,052      
Accumulated depreciation 252      
Net real estate $ 800      
Year construction/ improvements 1989      
Date acquired Dec. 13, 2007      
Decatur, Georgia Medical Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 257      
Buildings & improvements, initial cost 1,062      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 257      
Buildings & improvements, total cost 1,062      
Total 1,319      
Accumulated depreciation 317      
Net real estate $ 1,002      
Year construction/ improvements 1989      
Date acquired Dec. 13, 2007      
Lawrenceville, Georgia Medical Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 678      
Buildings & improvements, initial cost 2,807      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 678      
Buildings & improvements, total cost 2,807      
Total 3,485      
Accumulated depreciation 836      
Net real estate $ 2,649      
Year construction/ improvements 2005      
Date acquired Dec. 13, 2007      
Snellville, Georgia Medical Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 176      
Buildings & improvements, initial cost 727      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 176      
Buildings & improvements, total cost 727      
Total 903      
Accumulated depreciation 217      
Net real estate $ 686      
Year construction/ improvements 1986      
Date acquired Dec. 13, 2007      
Covington, Georgia Medical Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 232      
Buildings & improvements, initial cost 959      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 232      
Buildings & improvements, total cost 959      
Total 1,191      
Accumulated depreciation 286      
Net real estate $ 905      
Year construction/ improvements 2000      
Date acquired Dec. 13, 2007      
Conyers Georgia Office Building [Member]        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 296      
Buildings & improvements, initial cost 1,228      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 296      
Buildings & improvements, total cost 1,228      
Total 1,524      
Accumulated depreciation 366      
Net real estate $ 1,158      
Year construction/ improvements 1994      
Date acquired Dec. 13, 2007      
Cumming, Georgia Medical Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 2,821      
Land, initial cost 738      
Buildings & improvements, initial cost 3,055      
Improvement costs capitalized subsequent to acquisition 2,524      
Land, total cost 741      
Buildings & improvements, total cost 5,576      
Total 6,317      
Accumulated depreciation 1,327      
Net real estate $ 4,990      
Year construction/ improvements 2004      
Date acquired Dec. 13, 2007      
Reading, Pennsylvania Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 3,574      
Land, initial cost 491      
Buildings & improvements, initial cost 6,202      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 491      
Buildings & improvements, total cost 6,202      
Total 6,693      
Accumulated depreciation 1,742      
Net real estate $ 4,951      
Year construction/ improvements 2007      
Date acquired Jan. 29, 2008      
Fridley, Minnesota Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 4,658      
Land, initial cost 1,354      
Buildings & improvements, initial cost 8,074      
Improvement costs capitalized subsequent to acquisition 399      
Land, total cost 1,383      
Buildings & improvements, total cost 8,444      
Total 9,827      
Accumulated depreciation 2,841      
Net real estate $ 6,986      
Year construction/ improvements 1985      
Year construction/improvements one 2006      
Date acquired Feb. 26, 2008      
Pineville, North Carolina Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 2,077      
Land, initial cost 669      
Buildings & improvements, initial cost 3,028      
Improvement costs capitalized subsequent to acquisition 293      
Land, total cost 669      
Buildings & improvements, total cost 3,321      
Total 3,990      
Accumulated depreciation 879      
Net real estate $ 3,111      
Year construction/ improvements 1985      
Date acquired Apr. 30, 2008      
Marietta, Ohio Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 5,070      
Land, initial cost 829      
Buildings & improvements, initial cost 6,607      
Improvement costs capitalized subsequent to acquisition 529      
Land, total cost 829      
Buildings & improvements, total cost 7,136      
Total 7,965      
Accumulated depreciation 1,853      
Net real estate $ 6,112      
Year construction/ improvements 1992      
Year construction/improvements one 2007      
Date acquired Aug. 29, 2008      
Chalfont, Pennsylvania Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 4,548      
Land, initial cost 1,249      
Buildings & improvements, initial cost 6,420      
Improvement costs capitalized subsequent to acquisition 327      
Land, total cost 1,249      
Buildings & improvements, total cost 6,747      
Total 7,996      
Accumulated depreciation 2,007      
Net real estate $ 5,989      
Year construction/ improvements 1987      
Date acquired Aug. 29, 2008      
Orange City, Iowa Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 6,738      
Land, initial cost 258      
Buildings & improvements, initial cost 5,861      
Improvement costs capitalized subsequent to acquisition 6      
Land, total cost 258      
Buildings & improvements, total cost 5,867      
Total 6,125      
Accumulated depreciation 1,476      
Net real estate $ 4,649      
Year construction/ improvements 1990      
Date acquired Dec. 15, 2010      
Hickory, North Carolina Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 6,092      
Land, initial cost 1,163      
Buildings & improvements, initial cost 6,605      
Improvement costs capitalized subsequent to acquisition 13      
Land, total cost 1,163      
Buildings & improvements, total cost 6,618      
Total 7,781      
Accumulated depreciation 2,327      
Net real estate $ 5,454      
Year construction/ improvements 2008      
Date acquired Apr. 04, 2011      
Springfield, Missouri Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 1,700      
Buildings & improvements, initial cost 12,038      
Improvement costs capitalized subsequent to acquisition 549      
Land, total cost 1,844      
Buildings & improvements, total cost 12,443      
Total 14,287      
Accumulated depreciation 2,734      
Net real estate $ 11,553      
Year construction/ improvements 2006      
Date acquired Jun. 20, 2011      
Boston Heights, Ohio Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 2,407      
Land, initial cost 449      
Buildings & improvements, initial cost 3,010      
Improvement costs capitalized subsequent to acquisition 11      
Land, total cost 449      
Buildings & improvements, total cost 3,021      
Total 3,470      
Accumulated depreciation 965      
Net real estate $ 2,505      
Year construction/ improvements 2011      
Date acquired Oct. 20, 2011      
Parsippany, New Jersey Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 6,155      
Land, initial cost 1,696      
Buildings & improvements, initial cost 7,077      
Improvement costs capitalized subsequent to acquisition 81      
Land, total cost 1,696      
Buildings & improvements, total cost 7,158      
Total 8,854      
Accumulated depreciation 1,949      
Net real estate $ 6,905      
Year construction/ improvements 1984      
Date acquired Oct. 28, 2011      
Dartmouth, Massachusetts Retail Location        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 3,577      
Land, initial cost 0      
Buildings & improvements, initial cost 4,236      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 0      
Buildings & improvements, total cost 4,236      
Total 4,236      
Accumulated depreciation 842      
Net real estate $ 3,394      
Year construction/ improvements 2011      
Date acquired Nov. 18, 2011      
Springfield, Missouri Retail Location        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 1,449      
Land, initial cost 0      
Buildings & improvements, initial cost 2,275      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 0      
Buildings & improvements, total cost 2,275      
Total 2,275      
Accumulated depreciation 580      
Net real estate $ 1,695      
Year construction/ improvements 2005      
Date acquired Dec. 13, 2011      
Pittsburgh, Pennsylvania Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 2,483      
Land, initial cost 281      
Buildings & improvements, initial cost 3,205      
Improvement costs capitalized subsequent to acquisition 743      
Land, total cost 281      
Buildings & improvements, total cost 3,948      
Total 4,229      
Accumulated depreciation 929      
Net real estate $ 3,300      
Year construction/ improvements 1968      
Date acquired Dec. 28, 2011      
Ashburn, Virginia Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 6,480      
Land, initial cost 706      
Buildings & improvements, initial cost 7,858      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 705      
Buildings & improvements, total cost 7,859      
Total 8,564      
Accumulated depreciation 1,804      
Net real estate $ 6,760      
Year construction/ improvements 2002      
Date acquired Jan. 25, 2012      
Ottumwa, Iowa Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 3,356      
Land, initial cost 212      
Buildings & improvements, initial cost 5,072      
Improvement costs capitalized subsequent to acquisition 287      
Land, total cost 212      
Buildings & improvements, total cost 5,359      
Total 5,571      
Accumulated depreciation 1,208      
Net real estate $ 4,363      
Year construction/ improvements 1970      
Date acquired May 30, 2012      
New Albany, Ohio Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 7,709      
Land, initial cost 1,658      
Buildings & improvements, initial cost 8,746      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 1,658      
Buildings & improvements, total cost 8,746      
Total 10,404      
Accumulated depreciation 2,117      
Net real estate $ 8,287      
Year construction/ improvements 2007      
Date acquired Jun. 05, 2012      
Columbus, Georgia Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 4,057      
Land, initial cost 1,378      
Buildings & improvements, initial cost 4,520      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 1,378      
Buildings & improvements, total cost 4,520      
Total 5,898      
Accumulated depreciation 1,218      
Net real estate $ 4,680      
Year construction/ improvements 2012      
Date acquired Jun. 21, 2012      
Columbus, Ohio Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 2,543      
Land, initial cost 542      
Buildings & improvements, initial cost 2,453      
Improvement costs capitalized subsequent to acquisition 92      
Land, total cost 542      
Buildings & improvements, total cost 2,545      
Total 3,087      
Accumulated depreciation 758      
Net real estate $ 2,329      
Year construction/ improvements 1981      
Date acquired Jun. 28, 2012      
Jupiter, Florida Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 1,160      
Buildings & improvements, initial cost 11,994      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 1,160      
Buildings & improvements, total cost 11,994      
Total 13,154      
Accumulated depreciation 2,292      
Net real estate $ 10,862      
Year construction/ improvements 2011      
Date acquired Sep. 26, 2012      
Fort Worth, Texas Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 11,732      
Land, initial cost 963      
Buildings & improvements, initial cost 15,647      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 963      
Buildings & improvements, total cost 15,647      
Total 16,610      
Accumulated depreciation 2,928      
Net real estate $ 13,682      
Year construction/ improvements 2005      
Date acquired Nov. 08, 2012      
Columbia, South Carolina Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 16,036      
Land, initial cost 1,905      
Buildings & improvements, initial cost 20,648      
Improvement costs capitalized subsequent to acquisition 27      
Land, total cost 1,905      
Buildings & improvements, total cost 20,675      
Total 22,580      
Accumulated depreciation 5,409      
Net real estate $ 17,171      
Year construction/ improvements 2010      
Date acquired Nov. 21, 2012      
Egg Harbor, New Jersey Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 3,167      
Land, initial cost 1,627      
Buildings & improvements, initial cost 3,017      
Improvement costs capitalized subsequent to acquisition 315      
Land, total cost 1,627      
Buildings & improvements, total cost 3,332      
Total 4,959      
Accumulated depreciation 707      
Net real estate $ 4,252      
Year construction/ improvements 1985      
Date acquired Mar. 28, 2013      
Vance, Alabama Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 457      
Buildings & improvements, initial cost 10,529      
Improvement costs capitalized subsequent to acquisition 6,692      
Land, total cost 457      
Buildings & improvements, total cost 17,221      
Total 17,678      
Accumulated depreciation 2,361      
Net real estate $ 15,317      
Year construction/ improvements 2013      
Date acquired May 09, 2013      
Blaine, Minnesota Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 7,502      
Land, initial cost 1,060      
Buildings & improvements, initial cost 10,518      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 1,060      
Buildings & improvements, total cost 10,518      
Total 11,578      
Accumulated depreciation 2,574      
Net real estate $ 9,004      
Year construction/ improvements 2009      
Date acquired May 10, 2013      
Austin, Texas Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 32,196      
Land, initial cost 2,330      
Buildings & improvements, initial cost 44,021      
Improvement costs capitalized subsequent to acquisition 122      
Land, total cost 2,330      
Buildings & improvements, total cost 44,143      
Total 46,473      
Accumulated depreciation 12,527      
Net real estate $ 33,946      
Year construction/ improvements 1999      
Date acquired Jul. 09, 2013      
Allen, Texas Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 8,045      
Land, initial cost 2,699      
Buildings & improvements, initial cost 7,945      
Improvement costs capitalized subsequent to acquisition 1,221      
Land, total cost 2,699      
Buildings & improvements, total cost 9,166      
Total 11,865      
Accumulated depreciation 2,315      
Net real estate $ 9,550      
Year construction/ improvements 1998      
Date acquired Jul. 10, 2013      
Englewood, Colorado Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 10,306      
Land, initial cost 1,503      
Buildings & improvements, initial cost 11,739      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 1,503      
Buildings & improvements, total cost 11,739      
Total 13,242      
Accumulated depreciation 2,616      
Net real estate $ 10,626      
Year construction/ improvements 2008      
Date acquired Dec. 11, 2013      
Novi, Michigan Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 3,915      
Land, initial cost 352      
Buildings & improvements, initial cost 5,626      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 352      
Buildings & improvements, total cost 5,626      
Total 5,978      
Accumulated depreciation 975      
Net real estate $ 5,003      
Year construction/ improvements 1988      
Date acquired Dec. 27, 2013      
Allen, Texas Retail Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 2,951      
Land, initial cost 874      
Buildings & improvements, initial cost 3,634      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 874      
Buildings & improvements, total cost 3,634      
Total 4,508      
Accumulated depreciation 597      
Net real estate $ 3,911      
Year construction/ improvements 2004      
Date acquired Mar. 27, 2014      
Colleyville, Texas Retail Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 2,729      
Land, initial cost 1,277      
Buildings & improvements, initial cost 2,424      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 1,277      
Buildings & improvements, total cost 2,424      
Total 3,701      
Accumulated depreciation 455      
Net real estate $ 3,246      
Year construction/ improvements 2000      
Date acquired Mar. 27, 2014      
Rancho Cordova, California Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 4,660      
Land, initial cost 752      
Buildings & improvements, initial cost 6,176      
Improvement costs capitalized subsequent to acquisition 301      
Land, total cost 752      
Buildings & improvements, total cost 6,477      
Total 7,229      
Accumulated depreciation 1,038      
Net real estate $ 6,191      
Year construction/ improvements 1986      
Date acquired Apr. 22, 2014      
Coppell, Texas Retail Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 3,135      
Land, initial cost 1,448      
Buildings & improvements, initial cost 3,349      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 1,448      
Buildings & improvements, total cost 3,349      
Total 4,797      
Accumulated depreciation 535      
Net real estate $ 4,262      
Year construction/ improvements 2005      
Date acquired May 08, 2014      
Columbus, Ohio (3) Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 990      
Buildings & improvements, initial cost 8,017      
Improvement costs capitalized subsequent to acquisition 1,827      
Land, total cost 990      
Buildings & improvements, total cost 9,844      
Total 10,834      
Accumulated depreciation 2,102      
Net real estate $ 8,732      
Year construction/ improvements 1986      
Date acquired May 13, 2014      
Taylor, Pennsylvania Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 21,651      
Land, initial cost 3,101      
Buildings & improvements, initial cost 25,405      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 3,101      
Buildings & improvements, total cost 25,405      
Total 28,506      
Accumulated depreciation 3,672      
Net real estate $ 24,834      
Year construction/ improvements 2000      
Year construction/improvements one 2006      
Date acquired Jun. 09, 2014      
Aurora, Colorado Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 2,882      
Buildings & improvements, initial cost 3,917      
Improvement costs capitalized subsequent to acquisition 96      
Land, total cost 2,882      
Buildings & improvements, total cost 4,013      
Total 6,895      
Accumulated depreciation 735      
Net real estate $ 6,160      
Year construction/ improvements 1983      
Date acquired Jul. 01, 2014      
Indianapolis, Indiana Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 5,721      
Land, initial cost 502      
Buildings & improvements, initial cost 6,422      
Improvement costs capitalized subsequent to acquisition 1,079      
Land, total cost 498      
Buildings & improvements, total cost 7,505      
Total 8,003      
Accumulated depreciation 1,392      
Net real estate $ 6,611      
Year construction/ improvements 1981      
Year construction/improvements one 2014      
Date acquired Sep. 03, 2014      
Denver, Colorado Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 1,621      
Buildings & improvements, initial cost 7,071      
Improvement costs capitalized subsequent to acquisition 243      
Land, total cost 1,621      
Buildings & improvements, total cost 7,314      
Total 8,935      
Accumulated depreciation 1,157      
Net real estate $ 7,778      
Year construction/ improvements 1985      
Date acquired Oct. 31, 2014      
Monroe, Michigan Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 10,072      
Land, initial cost 658      
Buildings & improvements, initial cost 14,607      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 657      
Buildings & improvements, total cost 14,608      
Total 15,265      
Accumulated depreciation 1,839      
Net real estate $ 13,426      
Year construction/ improvements 2004      
Date acquired Dec. 23, 2014      
Monroe, Michigan Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 7,051      
Land, initial cost 460      
Buildings & improvements, initial cost 10,225      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 460      
Buildings & improvements, total cost 10,225      
Total 10,685      
Accumulated depreciation 1,288      
Net real estate $ 9,397      
Year construction/ improvements 2004      
Date acquired Dec. 23, 2014      
Richardson, Texas Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 13,590      
Land, initial cost 2,728      
Buildings & improvements, initial cost 15,372      
Improvement costs capitalized subsequent to acquisition 174      
Land, total cost 2,728      
Buildings & improvements, total cost 15,546      
Total 18,274      
Accumulated depreciation 2,648      
Net real estate $ 15,626      
Year construction/ improvements 1985      
Year construction/improvements one 2008      
Date acquired Mar. 06, 2015      
Birmingham, Alabama Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 650      
Buildings & improvements, initial cost 2,034      
Improvement costs capitalized subsequent to acquisition 50      
Land, total cost 650      
Buildings & improvements, total cost 2,084      
Total 2,734      
Accumulated depreciation 376      
Net real estate $ 2,358      
Year construction/ improvements 1982      
Year construction/improvements one 2010      
Date acquired Mar. 20, 2015      
Dublin, Ohio Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 4,074      
Land, initial cost 1,338      
Buildings & improvements, initial cost 5,058      
Improvement costs capitalized subsequent to acquisition 342      
Land, total cost 1,338      
Buildings & improvements, total cost 5,400      
Total 6,738      
Accumulated depreciation 874      
Net real estate $ 5,864      
Year construction/ improvements 1980      
Date acquired May 28, 2015      
Draper, Utah Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 12,430      
Land, initial cost 3,248      
Buildings & improvements, initial cost 13,129      
Improvement costs capitalized subsequent to acquisition 74      
Land, total cost 3,248      
Buildings & improvements, total cost 13,203      
Total 16,451      
Accumulated depreciation 1,920      
Net real estate $ 14,531      
Year construction/ improvements 2008      
Date acquired May 29, 2015      
Hapeville, Georgia Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 7,122      
Land, initial cost 2,272      
Buildings & improvements, initial cost 8,778      
Improvement costs capitalized subsequent to acquisition 263      
Land, total cost 2,272      
Buildings & improvements, total cost 9,041      
Total 11,313      
Accumulated depreciation 1,156      
Net real estate $ 10,157      
Year construction/ improvements 1999      
Year construction/improvements one 2007      
Date acquired Jul. 15, 2015      
Villa Rica, Georgia Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 3,613      
Land, initial cost 293      
Buildings & improvements, initial cost 5,277      
Improvement costs capitalized subsequent to acquisition 18      
Land, total cost 293      
Buildings & improvements, total cost 5,295      
Total 5,588      
Accumulated depreciation 633      
Net real estate $ 4,955      
Year construction/ improvements 2000      
Year construction/improvements one 2014      
Date acquired Oct. 20, 2015      
Taylorsville, Utah Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 9,346      
Land, initial cost 3,008      
Buildings & improvements, initial cost 10,659      
Improvement costs capitalized subsequent to acquisition 435      
Land, total cost 3,008      
Buildings & improvements, total cost 11,094      
Total 14,102      
Accumulated depreciation 1,513      
Net real estate $ 12,589      
Year construction/ improvements 1997      
Date acquired May 26, 2016      
Fort Lauderdale, Florida Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 13,381      
Land, initial cost 4,117      
Buildings & improvements, initial cost 15,516      
Improvement costs capitalized subsequent to acquisition 2,159      
Land, total cost 4,117      
Buildings & improvements, total cost 17,675      
Total 21,792      
Accumulated depreciation 1,827      
Net real estate $ 19,965      
Year construction/ improvements 1984      
Date acquired Sep. 12, 2016      
King of Prussia, Pennsylvania Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 14,800      
Land, initial cost 3,681      
Buildings & improvements, initial cost 15,739      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 3,681      
Buildings & improvements, total cost 15,739      
Total 19,420      
Accumulated depreciation 1,466      
Net real estate $ 17,954      
Year construction/ improvements 2001      
Date acquired Dec. 14, 2016      
Conshohocken Pennsylvania Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 10,742      
Land, initial cost 1,996      
Buildings & improvements, initial cost 10,880      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 1,996      
Buildings & improvements, total cost 10,880      
Total 12,876      
Accumulated depreciation 663      
Net real estate $ 12,213      
Year construction/ improvements 1996      
Date acquired Jun. 22, 2017      
Philadelphia Pennsylvania, Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 14,924      
Land, initial cost 5,896      
Buildings & improvements, initial cost 16,282      
Improvement costs capitalized subsequent to acquisition 10      
Land, total cost 5,906      
Buildings & improvements, total cost 16,282      
Total 22,188      
Accumulated depreciation 1,137      
Net real estate $ 21,051      
Year construction/ improvements 1994      
Year construction/improvements one 2011      
Date acquired Jul. 07, 2017      
Maitland Florida Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 11,619      
Land, initial cost 3,073      
Buildings & improvements, initial cost 19,661      
Improvement costs capitalized subsequent to acquisition 18      
Land, total cost 3,091      
Buildings & improvements, total cost 19,661      
Total 22,752      
Accumulated depreciation 1,524      
Net real estate $ 21,228      
Year construction/ improvements 1998      
Date acquired Jul. 31, 2017      
Maitland Florida Office Building Two        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 8,125      
Land, initial cost 2,077      
Buildings & improvements, initial cost 1,084      
Improvement costs capitalized subsequent to acquisition 12      
Land, total cost 2,077      
Buildings & improvements, total cost 1,096      
Total 3,173      
Accumulated depreciation 218      
Net real estate $ 2,955      
Year construction/ improvements 1998      
Date acquired Jul. 31, 2017      
Maitland Florida Office Building Three        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 8,125      
Land, initial cost 2,095      
Buildings & improvements, initial cost 9,339      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 2,095      
Buildings & improvements, total cost 9,339      
Total 11,434      
Accumulated depreciation 551      
Net real estate $ 10,883      
Year construction/ improvements 1999      
Date acquired Jul. 31, 2017      
Columbus Ohio Office Building Two        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 9,269      
Land, initial cost 1,926      
Buildings & improvements, initial cost 11,410      
Improvement costs capitalized subsequent to acquisition (1)      
Land, total cost 1,925      
Buildings & improvements, total cost 11,410      
Total 13,335      
Accumulated depreciation 618      
Net real estate $ 12,717      
Year construction/ improvements 2007      
Date acquired Dec. 01, 2017      
Salt Lake City Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 4,446      
Buildings & improvements, initial cost 9,938      
Improvement costs capitalized subsequent to acquisition 73      
Land, total cost 4,446      
Buildings & improvements, total cost 10,011      
Total 14,457      
Accumulated depreciation 526      
Net real estate $ 13,931      
Year construction/ improvements 2007      
Date acquired Dec. 01, 2017      
Vance, Alabama Industrial Building Two        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 459      
Buildings & improvements, initial cost 12,224      
Improvement costs capitalized subsequent to acquisition 29      
Land, total cost 469      
Buildings & improvements, total cost 12,243      
Total 12,712      
Accumulated depreciation 363      
Net real estate $ 12,349      
Year construction/ improvements 2018      
Date acquired Mar. 09, 2018      
Columbus, Ohio Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 4,729      
Land, initial cost 681      
Buildings & improvements, initial cost 6,401      
Improvement costs capitalized subsequent to acquisition 0      
Land, total cost 681      
Buildings & improvements, total cost 6,401      
Total 7,082      
Accumulated depreciation 93      
Net real estate $ 6,989      
Year construction/ improvements 1990      
Date acquired Sep. 20, 2018      
Detroit, Michigan Industrial Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 6,898      
Land, initial cost 1,458      
Buildings & improvements, initial cost 10,092      
Improvement costs capitalized subsequent to acquisition 3      
Land, total cost 1,461      
Buildings & improvements, total cost 10,092      
Total 11,553      
Accumulated depreciation 63      
Net real estate $ 11,490      
Year construction/ improvements 1997      
Date acquired Oct. 30, 2018      
Detroit, Michigan Industrial Building Two        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 662      
Buildings & improvements, initial cost 6,681      
Improvement costs capitalized subsequent to acquisition 3      
Land, total cost 665      
Buildings & improvements, total cost 6,681      
Total 7,346      
Accumulated depreciation 42      
Net real estate $ 7,304      
Year construction/ improvements 2002      
Year construction/improvements one 2016      
Date acquired Oct. 30, 2018      
Lake Mary, Florida Office Building        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances, initial cost $ 0      
Land, initial cost 3,018      
Buildings & improvements, initial cost 11,756      
Improvement costs capitalized subsequent to acquisition 3      
Land, total cost 3,021      
Buildings & improvements, total cost 11,756      
Total 14,777      
Accumulated depreciation 7      
Net real estate $ 14,770      
Year construction/ improvements 1997      
Year construction/improvements one 2018      
Date acquired Dec. 27, 2018