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Real Estate and Accumulated Depreciation (Schedule III Real Estate and Accumulated Depreciation, Senior Housing Operating) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 2,616,125      
Initial Cost of Land 2,653,655      
Initial Cost of Buildings & Improvements 26,257,700      
Cost Capitalized Subsequent to Acquisition 1,956,105      
Carrying Amount of Land 2,734,467      
Carrying Amount of Buildings and Improvements 27,847,481      
Accumulated Depreciation 4,838,370 $ 4,093,494 $ 3,796,297 $ 3,020,908
Seniors Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances 1,988,700      
Initial Cost of Land 1,174,980      
Initial Cost of Buildings & Improvements 12,626,419      
Cost Capitalized Subsequent to Acquisition 1,234,180      
Carrying Amount of Land 1,246,991      
Carrying Amount of Buildings and Improvements 13,788,584      
Accumulated Depreciation [1] 2,362,335      
Seniors Housing Operating [Member] | Acton, MA, ACT Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances 0      
Initial Cost of Land 0      
Initial Cost of Buildings & Improvements 31,346      
Cost Capitalized Subsequent to Acquisition 1,484      
Carrying Amount of Land 14      
Carrying Amount of Buildings and Improvements 32,816      
Accumulated Depreciation $ 5,154      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2000      
Seniors Housing Operating [Member] | Adderbury, UKJ, ADB Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,274      
Initial Cost of Buildings & Improvements 13,222      
Cost Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 2,274      
Carrying Amount of Buildings and Improvements 13,222      
Accumulated Depreciation $ 280      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2017      
Seniors Housing Operating [Member] | Agawam, MA, AGM2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 880      
Initial Cost of Buildings & Improvements 10,044      
Cost Capitalized Subsequent to Acquisition 671      
Carrying Amount of Land 959      
Carrying Amount of Buildings and Improvements 10,636      
Accumulated Depreciation $ 2,802      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1996      
Seniors Housing Operating [Member] | Albuquerque, NM, ABQ Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,270      
Initial Cost of Buildings & Improvements 20,837      
Cost Capitalized Subsequent to Acquisition 1,824      
Carrying Amount of Land 1,276      
Carrying Amount of Buildings and Improvements 22,655      
Accumulated Depreciation $ 5,732      
Year Acquired Jan. 01, 2010      
Year Built Jan. 01, 1984      
Seniors Housing Operating [Member] | Alhambra, CA, ALH Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 600      
Initial Cost of Buildings & Improvements 6,305      
Cost Capitalized Subsequent to Acquisition 9,025      
Carrying Amount of Land 600      
Carrying Amount of Buildings and Improvements 15,330      
Accumulated Depreciation $ 1,776      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1923      
Seniors Housing Operating [Member] | Altrincham, UKD, HLB Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 4,244      
Initial Cost of Buildings & Improvements 25,187      
Cost Capitalized Subsequent to Acquisition 3,246      
Carrying Amount of Land 4,654      
Carrying Amount of Buildings and Improvements 28,023      
Accumulated Depreciation $ 5,255      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Amherstview, ON, AMH Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 583      
Initial Cost of Land 473      
Initial Cost of Buildings & Improvements 4,446      
Cost Capitalized Subsequent to Acquisition 770      
Carrying Amount of Land 537      
Carrying Amount of Buildings and Improvements 5,152      
Accumulated Depreciation $ 717      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1974      
Seniors Housing Operating [Member] | Arlington, VA, ART Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 8,385      
Initial Cost of Buildings & Improvements 31,198      
Cost Capitalized Subsequent to Acquisition 15,714      
Carrying Amount of Land 8,385      
Carrying Amount of Buildings and Improvements 46,912      
Accumulated Depreciation $ 0      
Year Acquired Jan. 01, 2017      
Year Built Jan. 01, 1992      
Seniors Housing Operating [Member] | Arlington, TX, ARL2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 20,668      
Initial Cost of Land 1,660      
Initial Cost of Buildings & Improvements 37,395      
Cost Capitalized Subsequent to Acquisition 3,110      
Carrying Amount of Land 1,709      
Carrying Amount of Buildings and Improvements 40,456      
Accumulated Depreciation $ 9,983      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2000      
Seniors Housing Operating [Member] | Arnprior, ON, ARR Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 303      
Initial Cost of Land 788      
Initial Cost of Buildings & Improvements 6,283      
Cost Capitalized Subsequent to Acquisition 961      
Carrying Amount of Land 880      
Carrying Amount of Buildings and Improvements 7,152      
Accumulated Depreciation $ 1,435      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1991      
Seniors Housing Operating [Member] | Atlanta, GA, ATL4 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,100      
Initial Cost of Buildings & Improvements 20,603      
Cost Capitalized Subsequent to Acquisition 1,167      
Carrying Amount of Land 2,154      
Carrying Amount of Buildings and Improvements 21,717      
Accumulated Depreciation $ 3,478      
Year Acquired Jan. 01, 2014      
Year Built Jan. 01, 2000      
Seniors Housing Operating [Member] | Austin, TX, ATN3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,560      
Initial Cost of Buildings & Improvements 21,413      
Cost Capitalized Subsequent to Acquisition 185      
Carrying Amount of Land 1,560      
Carrying Amount of Buildings and Improvements 21,598      
Accumulated Depreciation $ 2,408      
Year Acquired Jan. 01, 2014      
Year Built Jan. 01, 2013      
Seniors Housing Operating [Member] | Austin, TX, ATN5 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 4,200      
Initial Cost of Buildings & Improvements 74,850      
Cost Capitalized Subsequent to Acquisition 510      
Carrying Amount of Land 4,200      
Carrying Amount of Buildings and Improvements 75,361      
Accumulated Depreciation $ 6,004      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2014      
Seniors Housing Operating [Member] | Avon, CT, AVO Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,550      
Initial Cost of Buildings & Improvements 30,571      
Cost Capitalized Subsequent to Acquisition 3,806      
Carrying Amount of Land 1,588      
Carrying Amount of Buildings and Improvements 34,339      
Accumulated Depreciation $ 9,420      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Azusa, CA, AZS Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 570      
Initial Cost of Buildings & Improvements 3,141      
Cost Capitalized Subsequent to Acquisition 7,769      
Carrying Amount of Land 570      
Carrying Amount of Buildings and Improvements 10,910      
Accumulated Depreciation $ 3,003      
Year Acquired Jan. 01, 1998      
Year Built Jan. 01, 1953      
Seniors Housing Operating [Member] | Bagshot, UKJ, BAG Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 4,960      
Initial Cost of Buildings & Improvements 29,881      
Cost Capitalized Subsequent to Acquisition 3,750      
Carrying Amount of Land 5,445      
Carrying Amount of Buildings and Improvements 33,146      
Accumulated Depreciation $ 6,692      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Banstead, UKJ, BST Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 6,695      
Initial Cost of Buildings & Improvements 55,113      
Cost Capitalized Subsequent to Acquisition 7,232      
Carrying Amount of Land 7,342      
Carrying Amount of Buildings and Improvements 61,698      
Accumulated Depreciation $ 10,975      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2005      
Seniors Housing Operating [Member] | Basingstoke, UKJ, BSK Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,420      
Initial Cost of Buildings & Improvements 18,853      
Cost Capitalized Subsequent to Acquisition 2,220      
Carrying Amount of Land 3,750      
Carrying Amount of Buildings and Improvements 20,742      
Accumulated Depreciation $ 2,112      
Year Acquired Jan. 01, 2014      
Year Built Jan. 01, 2012      
Seniors Housing Operating [Member] | Basking Ridge, NJ, BKR Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,356      
Initial Cost of Buildings & Improvements 37,710      
Cost Capitalized Subsequent to Acquisition 1,359      
Carrying Amount of Land 2,395      
Carrying Amount of Buildings and Improvements 39,031      
Accumulated Depreciation $ 6,952      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2002      
Seniors Housing Operating [Member] | Bassett, UKJ, BAT Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 4,874      
Initial Cost of Buildings & Improvements 32,304      
Cost Capitalized Subsequent to Acquisition 5,617      
Carrying Amount of Land 5,358      
Carrying Amount of Buildings and Improvements 37,436      
Accumulated Depreciation $ 7,099      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2006      
Seniors Housing Operating [Member] | Bath, UKK, BAH Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,855      
Initial Cost of Buildings & Improvements 12,485      
Cost Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 2,855      
Carrying Amount of Buildings and Improvements 12,485      
Accumulated Depreciation $ 237      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2017      
Seniors Housing Operating [Member] | Baton Rouge, LA, BTR Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 9,017      
Initial Cost of Land 790      
Initial Cost of Buildings & Improvements 29,436      
Cost Capitalized Subsequent to Acquisition 612      
Carrying Amount of Land 842      
Carrying Amount of Buildings and Improvements 29,996      
Accumulated Depreciation $ 5,264      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Beaconsfield, UKJ, BCF Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 5,566      
Initial Cost of Buildings & Improvements 50,952      
Cost Capitalized Subsequent to Acquisition 5,591      
Carrying Amount of Land 6,115      
Carrying Amount of Buildings and Improvements 55,993      
Accumulated Depreciation $ 9,757      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Beaconsfield, QC, BFD Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,149      
Initial Cost of Buildings & Improvements 17,484      
Cost Capitalized Subsequent to Acquisition 2,304      
Carrying Amount of Land 1,335      
Carrying Amount of Buildings and Improvements 19,602      
Accumulated Depreciation $ 4,833      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2008      
Seniors Housing Operating [Member] | Bedford, NH, BED2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,527      
Initial Cost of Buildings & Improvements 28,748      
Cost Capitalized Subsequent to Acquisition 2,105      
Carrying Amount of Land 2,548      
Carrying Amount of Buildings and Improvements 30,832      
Accumulated Depreciation $ 4,927      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 2012      
Seniors Housing Operating [Member] | Bee Cave, TX, BCA Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,820      
Initial Cost of Buildings & Improvements 21,084      
Cost Capitalized Subsequent to Acquisition 708      
Carrying Amount of Land 1,820      
Carrying Amount of Buildings and Improvements 21,792      
Accumulated Depreciation $ 1,755      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 2014      
Seniors Housing Operating [Member] | Bellevue, WA, BVE Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,800      
Initial Cost of Buildings & Improvements 19,004      
Cost Capitalized Subsequent to Acquisition 2,072      
Carrying Amount of Land 2,816      
Carrying Amount of Buildings and Improvements 21,060      
Accumulated Depreciation $ 4,586      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Belmont, CA, BMH Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,000      
Initial Cost of Buildings & Improvements 23,526      
Cost Capitalized Subsequent to Acquisition 2,254      
Carrying Amount of Land 3,000      
Carrying Amount of Buildings and Improvements 25,780      
Accumulated Depreciation $ 6,244      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1971      
Seniors Housing Operating [Member] | Belmont, CA, BMH2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 0      
Initial Cost of Buildings & Improvements 35,300      
Cost Capitalized Subsequent to Acquisition 1,837      
Carrying Amount of Land 37      
Carrying Amount of Buildings and Improvements 37,100      
Accumulated Depreciation $ 6,940      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2002      
Seniors Housing Operating [Member] | Berkeley, CA, BKY Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 12,433      
Initial Cost of Land 3,050      
Initial Cost of Buildings & Improvements 32,677      
Cost Capitalized Subsequent to Acquisition 3,757      
Carrying Amount of Land 3,050      
Carrying Amount of Buildings and Improvements 36,434      
Accumulated Depreciation $ 3,323      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 1966      
Seniors Housing Operating [Member] | Bethesda, MD, BTH Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 0      
Initial Cost of Buildings & Improvements 45,309      
Cost Capitalized Subsequent to Acquisition 593      
Carrying Amount of Land 3      
Carrying Amount of Buildings and Improvements 45,900      
Accumulated Depreciation $ 8,359      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Bethesda, MD, BTHAU Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 0      
Initial Cost of Buildings & Improvements 45      
Cost Capitalized Subsequent to Acquisition 489      
Carrying Amount of Land 0      
Carrying Amount of Buildings and Improvements 534      
Accumulated Depreciation $ 67      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Bethesda, MD, BTHMC Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 0      
Initial Cost of Buildings & Improvements 212      
Cost Capitalized Subsequent to Acquisition 871      
Carrying Amount of Land 0      
Carrying Amount of Buildings and Improvements 1,083      
Accumulated Depreciation $ 128      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Billerica, MA, BIL Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,619      
Initial Cost of Buildings & Improvements 21,381      
Cost Capitalized Subsequent to Acquisition 753      
Carrying Amount of Land 1,624      
Carrying Amount of Buildings and Improvements 22,130      
Accumulated Depreciation $ 2,501      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2000      
Seniors Housing Operating [Member] | Birmingham, UKG, BMG Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 4      
Initial Cost of Buildings & Improvements 21,321      
Cost Capitalized Subsequent to Acquisition 2,252      
Carrying Amount of Land 30      
Carrying Amount of Buildings and Improvements 23,547      
Accumulated Depreciation $ 4,629      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2006      
Seniors Housing Operating [Member] | Birmingham, UKG, BMG2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,480      
Initial Cost of Buildings & Improvements 13,014      
Cost Capitalized Subsequent to Acquisition 1,500      
Carrying Amount of Land 1,623      
Carrying Amount of Buildings and Improvements 14,371      
Accumulated Depreciation $ 423      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2016      
Seniors Housing Operating [Member] | Birmingham, UKG, SNC Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,807      
Initial Cost of Buildings & Improvements 11,313      
Cost Capitalized Subsequent to Acquisition 1,449      
Carrying Amount of Land 3,078      
Carrying Amount of Buildings and Improvements 12,491      
Accumulated Depreciation $ 335      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2016      
Seniors Housing Operating [Member] | Blainville, QC, BVL Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,077      
Initial Cost of Buildings & Improvements 8,902      
Cost Capitalized Subsequent to Acquisition 1,398      
Carrying Amount of Land 2,306      
Carrying Amount of Buildings and Improvements 10,071      
Accumulated Depreciation $ 2,907      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2008      
Seniors Housing Operating [Member] | Bloomfield Hills, MI, BLM Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,000      
Initial Cost of Buildings & Improvements 35,662      
Cost Capitalized Subsequent to Acquisition 767      
Carrying Amount of Land 2,008      
Carrying Amount of Buildings and Improvements 36,421      
Accumulated Depreciation $ 6,477      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Borehamwood, UKH, BHD Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 5,367      
Initial Cost of Buildings & Improvements 41,937      
Cost Capitalized Subsequent to Acquisition 5,041      
Carrying Amount of Land 5,900      
Carrying Amount of Buildings and Improvements 46,445      
Accumulated Depreciation $ 8,293      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2003      
Seniors Housing Operating [Member] | Bothell, WA, BHL Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,350      
Initial Cost of Buildings & Improvements 13,439      
Cost Capitalized Subsequent to Acquisition 4,808      
Carrying Amount of Land 1,361      
Carrying Amount of Buildings and Improvements 18,237      
Accumulated Depreciation $ 1,626      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1988      
Seniors Housing Operating [Member] | Boulder, CO, BOL Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,994      
Initial Cost of Buildings & Improvements 27,458      
Cost Capitalized Subsequent to Acquisition 2,065      
Carrying Amount of Land 3,022      
Carrying Amount of Buildings and Improvements 29,495      
Accumulated Depreciation $ 6,557      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2003      
Seniors Housing Operating [Member] | Bournemouth, UKK, SBE Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 5,527      
Initial Cost of Buildings & Improvements 42,547      
Cost Capitalized Subsequent to Acquisition 5,311      
Carrying Amount of Land 6,061      
Carrying Amount of Buildings and Improvements 47,324      
Accumulated Depreciation $ 6,943      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2008      
Seniors Housing Operating [Member] | Braintree, MA, BRA3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 0      
Initial Cost of Buildings & Improvements 41,290      
Cost Capitalized Subsequent to Acquisition 862      
Carrying Amount of Land 56      
Carrying Amount of Buildings and Improvements 42,097      
Accumulated Depreciation $ 7,828      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2007      
Seniors Housing Operating [Member] | Brampton, ON, BPT Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 45,677      
Initial Cost of Land 10,256      
Initial Cost of Buildings & Improvements 60,021      
Cost Capitalized Subsequent to Acquisition 5,524      
Carrying Amount of Land 11,107      
Carrying Amount of Buildings and Improvements 64,694      
Accumulated Depreciation $ 8,646      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Brighton, MA, BRI2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 9,911      
Initial Cost of Land 2,100      
Initial Cost of Buildings & Improvements 14,616      
Cost Capitalized Subsequent to Acquisition 1,391      
Carrying Amount of Land 2,109      
Carrying Amount of Buildings and Improvements 15,998      
Accumulated Depreciation $ 4,149      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1995      
Seniors Housing Operating [Member] | Brockport, NY, BKP Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,500      
Initial Cost of Buildings & Improvements 23,496      
Cost Capitalized Subsequent to Acquisition 503      
Carrying Amount of Land 1,705      
Carrying Amount of Buildings and Improvements 23,794      
Accumulated Depreciation $ 3,164      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Brockville, ON, BCK Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 4,808      
Initial Cost of Land 484      
Initial Cost of Buildings & Improvements 7,445      
Cost Capitalized Subsequent to Acquisition 1,040      
Carrying Amount of Land 543      
Carrying Amount of Buildings and Improvements 8,426      
Accumulated Depreciation $ 1,034      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1996      
Seniors Housing Operating [Member] | Brookfield, CT, BRO Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,250      
Initial Cost of Buildings & Improvements 30,180      
Cost Capitalized Subsequent to Acquisition 2,422      
Carrying Amount of Land 2,262      
Carrying Amount of Buildings and Improvements 32,590      
Accumulated Depreciation $ 8,207      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Broomfield, CO, BMF Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 4,140      
Initial Cost of Buildings & Improvements 44,547      
Cost Capitalized Subsequent to Acquisition 11,669      
Carrying Amount of Land 10,135      
Carrying Amount of Buildings and Improvements 50,221      
Accumulated Depreciation $ 14,474      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Brossard, QC, BSD Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 11,807      
Initial Cost of Land 5,499      
Initial Cost of Buildings & Improvements 31,854      
Cost Capitalized Subsequent to Acquisition 3,168      
Carrying Amount of Land 5,912      
Carrying Amount of Buildings and Improvements 34,609      
Accumulated Depreciation $ 4,674      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1989      
Seniors Housing Operating [Member] | Buckingham, UKJ, BKG Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,979      
Initial Cost of Buildings & Improvements 13,880      
Cost Capitalized Subsequent to Acquisition 1,764      
Carrying Amount of Land 3,267      
Carrying Amount of Buildings and Improvements 15,356      
Accumulated Depreciation $ 2,047      
Year Acquired Jan. 01, 2014      
Year Built Jan. 01, 1883      
Seniors Housing Operating [Member] | Buffalo Grove, IL, BFG Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,850      
Initial Cost of Buildings & Improvements 49,129      
Cost Capitalized Subsequent to Acquisition 1,272      
Carrying Amount of Land 2,850      
Carrying Amount of Buildings and Improvements 50,401      
Accumulated Depreciation $ 9,134      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2003      
Seniors Housing Operating [Member] | Burbank, CA, BRB Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 4,940      
Initial Cost of Buildings & Improvements 43,466      
Cost Capitalized Subsequent to Acquisition 1,324      
Carrying Amount of Land 4,940      
Carrying Amount of Buildings and Improvements 44,790      
Accumulated Depreciation $ 9,465      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2002      
Seniors Housing Operating [Member] | Burbank, CA, BRB2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 19,593      
Initial Cost of Land 3,610      
Initial Cost of Buildings & Improvements 50,817      
Cost Capitalized Subsequent to Acquisition 3,284      
Carrying Amount of Land 3,610      
Carrying Amount of Buildings and Improvements 54,101      
Accumulated Depreciation $ 4,187      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 1985      
Seniors Housing Operating [Member] | Burleson, TX, BRS3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,150      
Initial Cost of Buildings & Improvements 10,437      
Cost Capitalized Subsequent to Acquisition 626      
Carrying Amount of Land 3,150      
Carrying Amount of Buildings and Improvements 11,063      
Accumulated Depreciation $ 1,049      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2014      
Seniors Housing Operating [Member] | Burlingame, CA, BGM Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 0      
Initial Cost of Buildings & Improvements 62,786      
Cost Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 0      
Carrying Amount of Buildings and Improvements 62,786      
Accumulated Depreciation $ 980      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 2015      
Seniors Housing Operating [Member] | Burlington, ON, BGN Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 13,151      
Initial Cost of Land 1,309      
Initial Cost of Buildings & Improvements 19,311      
Cost Capitalized Subsequent to Acquisition 2,496      
Carrying Amount of Land 1,453      
Carrying Amount of Buildings and Improvements 21,663      
Accumulated Depreciation $ 4,163      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1990      
Seniors Housing Operating [Member] | Burlington, MA, BGT Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,443      
Initial Cost of Buildings & Improvements 34,354      
Cost Capitalized Subsequent to Acquisition 1,350      
Carrying Amount of Land 2,522      
Carrying Amount of Buildings and Improvements 35,626      
Accumulated Depreciation $ 6,963      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2005      
Seniors Housing Operating [Member] | Burlington, MA, BGT2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,750      
Initial Cost of Buildings & Improvements 57,488      
Cost Capitalized Subsequent to Acquisition 3,167      
Carrying Amount of Land 2,750      
Carrying Amount of Buildings and Improvements 60,655      
Accumulated Depreciation $ 3,673      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 2011      
Seniors Housing Operating [Member] | Calabasas, CA, CLS Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 0      
Initial Cost of Buildings & Improvements 6,438      
Cost Capitalized Subsequent to Acquisition 977      
Carrying Amount of Land 0      
Carrying Amount of Buildings and Improvements 7,415      
Accumulated Depreciation $ 5,256      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1972      
Seniors Housing Operating [Member] | Calgary, AB, CAL2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 12,898      
Initial Cost of Land 2,252      
Initial Cost of Buildings & Improvements 37,415      
Cost Capitalized Subsequent to Acquisition 4,862      
Carrying Amount of Land 2,492      
Carrying Amount of Buildings and Improvements 42,036      
Accumulated Depreciation $ 8,321      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2003      
Seniors Housing Operating [Member] | Calgary, AB, CAL3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 14,751      
Initial Cost of Land 2,793      
Initial Cost of Buildings & Improvements 41,179      
Cost Capitalized Subsequent to Acquisition 4,956      
Carrying Amount of Land 3,098      
Carrying Amount of Buildings and Improvements 45,831      
Accumulated Depreciation $ 8,857      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Calgary, AB, CAL4 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 11,678      
Initial Cost of Land 3,122      
Initial Cost of Buildings & Improvements 38,971      
Cost Capitalized Subsequent to Acquisition 4,817      
Carrying Amount of Land 3,464      
Carrying Amount of Buildings and Improvements 43,446      
Accumulated Depreciation $ 8,314      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Calgary, AB, CAL5 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 23,927      
Initial Cost of Land 3,431      
Initial Cost of Buildings & Improvements 28,983      
Cost Capitalized Subsequent to Acquisition 4,572      
Carrying Amount of Land 3,810      
Carrying Amount of Buildings and Improvements 33,176      
Accumulated Depreciation $ 5,378      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1989      
Seniors Housing Operating [Member] | Calgary, AB, CAL8 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 26,364      
Initial Cost of Land 2,385      
Initial Cost of Buildings & Improvements 36,776      
Cost Capitalized Subsequent to Acquisition 4,457      
Carrying Amount of Land 2,642      
Carrying Amount of Buildings and Improvements 40,978      
Accumulated Depreciation $ 5,167      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2006      
Seniors Housing Operating [Member] | Camberley, UKJ, CBL3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,654      
Initial Cost of Buildings & Improvements 5,736      
Cost Capitalized Subsequent to Acquisition 19,242      
Carrying Amount of Land 7,914      
Carrying Amount of Buildings and Improvements 19,717      
Accumulated Depreciation $ 624      
Year Acquired Jan. 01, 2014      
Year Built Jan. 01, 2016      
Seniors Housing Operating [Member] | Camberley, UKJ, CBL4 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 731      
Initial Cost of Buildings & Improvements 3,164      
Cost Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 731      
Carrying Amount of Buildings and Improvements 3,164      
Accumulated Depreciation $ 24      
Year Acquired Jan. 01, 2014      
Year Built Jan. 01, 2017      
Seniors Housing Operating [Member] | Cardiff, UKL, CDF Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,191      
Initial Cost of Buildings & Improvements 12,566      
Cost Capitalized Subsequent to Acquisition 1,786      
Carrying Amount of Land 3,499      
Carrying Amount of Buildings and Improvements 14,043      
Accumulated Depreciation $ 3,315      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2007      
Seniors Housing Operating [Member] | Cardiff by the Sea, CA, CDS Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 37,915      
Initial Cost of Land 5,880      
Initial Cost of Buildings & Improvements 64,711      
Cost Capitalized Subsequent to Acquisition 1,925      
Carrying Amount of Land 5,880      
Carrying Amount of Buildings and Improvements 66,636      
Accumulated Depreciation $ 14,057      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Carol Stream, IL, CAO Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,730      
Initial Cost of Buildings & Improvements 55,048      
Cost Capitalized Subsequent to Acquisition 1,723      
Carrying Amount of Land 1,730      
Carrying Amount of Buildings and Improvements 56,771      
Accumulated Depreciation $ 11,184      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2001      
Seniors Housing Operating [Member] | Carrollton, TX, CRL3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 4,280      
Initial Cost of Buildings & Improvements 31,444      
Cost Capitalized Subsequent to Acquisition 941      
Carrying Amount of Land 4,280      
Carrying Amount of Buildings and Improvements 32,385      
Accumulated Depreciation $ 3,353      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2010      
Seniors Housing Operating [Member] | Cary, NC, CRY2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 740      
Initial Cost of Buildings & Improvements 45,240      
Cost Capitalized Subsequent to Acquisition 635      
Carrying Amount of Land 740      
Carrying Amount of Buildings and Improvements 45,875      
Accumulated Depreciation $ 7,154      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Cedar Park, TX, CEP Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,750      
Initial Cost of Buildings & Improvements 15,664      
Cost Capitalized Subsequent to Acquisition 759      
Carrying Amount of Land 1,750      
Carrying Amount of Buildings and Improvements 16,422      
Accumulated Depreciation $ 649      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 2015      
Seniors Housing Operating [Member] | Centerville, MA, CTR2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,300      
Initial Cost of Buildings & Improvements 27,357      
Cost Capitalized Subsequent to Acquisition 1,113      
Carrying Amount of Land 1,324      
Carrying Amount of Buildings and Improvements 28,446      
Accumulated Depreciation $ 6,327      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Cerritos, CA, CRR Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 0      
Initial Cost of Buildings & Improvements 27,494      
Cost Capitalized Subsequent to Acquisition 5,633      
Carrying Amount of Land 0      
Carrying Amount of Buildings and Improvements 33,127      
Accumulated Depreciation $ 3,641      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 2002      
Seniors Housing Operating [Member] | Chatham, ON, CTM Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 1,253      
Initial Cost of Land 1,098      
Initial Cost of Buildings & Improvements 12,462      
Cost Capitalized Subsequent to Acquisition 2,960      
Carrying Amount of Land 1,290      
Carrying Amount of Buildings and Improvements 15,230      
Accumulated Depreciation $ 2,947      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1965      
Seniors Housing Operating [Member] | Chelmsford, MA, CHM3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,589      
Initial Cost of Buildings & Improvements 26,432      
Cost Capitalized Subsequent to Acquisition 1,214      
Carrying Amount of Land 1,651      
Carrying Amount of Buildings and Improvements 27,585      
Accumulated Depreciation $ 2,988      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1997      
Seniors Housing Operating [Member] | Chertsey, UKJ, CTY Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 0      
Initial Cost of Buildings & Improvements 105      
Cost Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 0      
Carrying Amount of Buildings and Improvements 105      
Accumulated Depreciation $ 0      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1900      
Seniors Housing Operating [Member] | Chesterfield, MO, CHF Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,857      
Initial Cost of Buildings & Improvements 48,366      
Cost Capitalized Subsequent to Acquisition 1,299      
Carrying Amount of Land 1,917      
Carrying Amount of Buildings and Improvements 49,605      
Accumulated Depreciation $ 8,273      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2001      
Seniors Housing Operating [Member] | Chorleywood, UKH, CYD Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 5,636      
Initial Cost of Buildings & Improvements 43,191      
Cost Capitalized Subsequent to Acquisition 6,324      
Carrying Amount of Land 6,184      
Carrying Amount of Buildings and Improvements 48,967      
Accumulated Depreciation $ 8,985      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2007      
Seniors Housing Operating [Member] | Chula Vista, CA, BNA Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,072      
Initial Cost of Buildings & Improvements 22,163      
Cost Capitalized Subsequent to Acquisition 863      
Carrying Amount of Land 2,128      
Carrying Amount of Buildings and Improvements 22,970      
Accumulated Depreciation $ 4,259      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2003      
Seniors Housing Operating [Member] | Church Crookham, UKJ, CCK Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,591      
Initial Cost of Buildings & Improvements 14,215      
Cost Capitalized Subsequent to Acquisition 1,832      
Carrying Amount of Land 2,855      
Carrying Amount of Buildings and Improvements 15,783      
Accumulated Depreciation $ 2,283      
Year Acquired Jan. 01, 2014      
Year Built Jan. 01, 2014      
Seniors Housing Operating [Member] | Cincinnati, OH, KEW Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,060      
Initial Cost of Buildings & Improvements 109,388      
Cost Capitalized Subsequent to Acquisition 13,115      
Carrying Amount of Land 2,078      
Carrying Amount of Buildings and Improvements 122,485      
Accumulated Depreciation $ 22,924      
Year Acquired Jan. 01, 2007      
Year Built Jan. 01, 2010      
Seniors Housing Operating [Member] | Claremont, CA, CMT Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,430      
Initial Cost of Buildings & Improvements 9,928      
Cost Capitalized Subsequent to Acquisition 1,375      
Carrying Amount of Land 2,483      
Carrying Amount of Buildings and Improvements 11,249      
Accumulated Depreciation $ 2,373      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2001      
Seniors Housing Operating [Member] | Cohasset, MA, COH2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,485      
Initial Cost of Buildings & Improvements 26,147      
Cost Capitalized Subsequent to Acquisition 1,758      
Carrying Amount of Land 2,487      
Carrying Amount of Buildings and Improvements 27,903      
Accumulated Depreciation $ 5,172      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Colleyville, TX, CYV Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,050      
Initial Cost of Buildings & Improvements 17,082      
Cost Capitalized Subsequent to Acquisition 40      
Carrying Amount of Land 1,050      
Carrying Amount of Buildings and Improvements 17,122      
Accumulated Depreciation $ 459      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 2013      
Seniors Housing Operating [Member] | Colorado Springs, CO, CSP2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 800      
Initial Cost of Buildings & Improvements 14,756      
Cost Capitalized Subsequent to Acquisition 1,801      
Carrying Amount of Land 1,017      
Carrying Amount of Buildings and Improvements 16,341      
Accumulated Depreciation $ 3,010      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2001      
Seniors Housing Operating [Member] | Concord, NH, CNC Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 720      
Initial Cost of Buildings & Improvements 21,164      
Cost Capitalized Subsequent to Acquisition 789      
Carrying Amount of Land 779      
Carrying Amount of Buildings and Improvements 21,893      
Accumulated Depreciation $ 4,812      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 2001      
Seniors Housing Operating [Member] | Coquitlam, BC, CQT Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 10,477      
Initial Cost of Land 3,047      
Initial Cost of Buildings & Improvements 24,567      
Cost Capitalized Subsequent to Acquisition 3,268      
Carrying Amount of Land 3,375      
Carrying Amount of Buildings and Improvements 27,507      
Accumulated Depreciation $ 6,467      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1990      
Seniors Housing Operating [Member] | Costa Mesa, CA, CST Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,050      
Initial Cost of Buildings & Improvements 19,969      
Cost Capitalized Subsequent to Acquisition 1,320      
Carrying Amount of Land 2,050      
Carrying Amount of Buildings and Improvements 21,289      
Accumulated Depreciation $ 5,139      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1965      
Seniors Housing Operating [Member] | Crystal Lake, IL, CLA2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 875      
Initial Cost of Buildings & Improvements 12,461      
Cost Capitalized Subsequent to Acquisition 1,259      
Carrying Amount of Land 893      
Carrying Amount of Buildings and Improvements 13,701      
Accumulated Depreciation $ 3,023      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2001      
Seniors Housing Operating [Member] | Dallas, TX, DAL3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 6,330      
Initial Cost of Buildings & Improvements 114,794      
Cost Capitalized Subsequent to Acquisition 1,199      
Carrying Amount of Land 6,330      
Carrying Amount of Buildings and Improvements 115,993      
Accumulated Depreciation $ 10,306      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2013      
Seniors Housing Operating [Member] | Danvers, MA, DAN Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,120      
Initial Cost of Buildings & Improvements 14,557      
Cost Capitalized Subsequent to Acquisition 1,045      
Carrying Amount of Land 1,145      
Carrying Amount of Buildings and Improvements 15,576      
Accumulated Depreciation $ 3,873      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 2000      
Seniors Housing Operating [Member] | Danvers, MA, DAN2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,203      
Initial Cost of Buildings & Improvements 28,761      
Cost Capitalized Subsequent to Acquisition 276      
Carrying Amount of Land 2,257      
Carrying Amount of Buildings and Improvements 28,983      
Accumulated Depreciation $ 3,667      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1997      
Seniors Housing Operating [Member] | Davenport, IA, DAV Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,403      
Initial Cost of Buildings & Improvements 35,893      
Cost Capitalized Subsequent to Acquisition 3,632      
Carrying Amount of Land 1,480      
Carrying Amount of Buildings and Improvements 39,448      
Accumulated Depreciation $ 9,192      
Year Acquired Jan. 01, 2006      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Decatur, GA, DEC2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,946      
Initial Cost of Buildings & Improvements 26,575      
Cost Capitalized Subsequent to Acquisition 2,080      
Carrying Amount of Land 1,946      
Carrying Amount of Buildings and Improvements 28,656      
Accumulated Depreciation $ 5,798      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Denver, CO, DVR4 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 12,033      
Initial Cost of Land 1,450      
Initial Cost of Buildings & Improvements 19,389      
Cost Capitalized Subsequent to Acquisition 3,119      
Carrying Amount of Land 1,470      
Carrying Amount of Buildings and Improvements 22,489      
Accumulated Depreciation $ 4,114      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 1997      
Seniors Housing Operating [Member] | Denver, CO, DVR5 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,910      
Initial Cost of Buildings & Improvements 35,838      
Cost Capitalized Subsequent to Acquisition 1,459      
Carrying Amount of Land 2,962      
Carrying Amount of Buildings and Improvements 37,246      
Accumulated Depreciation $ 8,399      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2007      
Seniors Housing Operating [Member] | Dix Hills, NY, DHL Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,808      
Initial Cost of Buildings & Improvements 39,014      
Cost Capitalized Subsequent to Acquisition 1,430      
Carrying Amount of Land 3,824      
Carrying Amount of Buildings and Improvements 40,428      
Accumulated Depreciation $ 7,473      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2003      
Seniors Housing Operating [Member] | Dollard-Des-Ormeaux, QC, DDO Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,957      
Initial Cost of Buildings & Improvements 14,431      
Cost Capitalized Subsequent to Acquisition 1,982      
Carrying Amount of Land 2,222      
Carrying Amount of Buildings and Improvements 16,149      
Accumulated Depreciation $ 4,757      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2008      
Seniors Housing Operating [Member] | Dresher, PA, DRS2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 6,966      
Initial Cost of Land 1,900      
Initial Cost of Buildings & Improvements 10,664      
Cost Capitalized Subsequent to Acquisition 896      
Carrying Amount of Land 1,914      
Carrying Amount of Buildings and Improvements 11,547      
Accumulated Depreciation $ 3,259      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2006      
Seniors Housing Operating [Member] | Dublin, OH, DUB Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,680      
Initial Cost of Buildings & Improvements 43,423      
Cost Capitalized Subsequent to Acquisition 6,429      
Carrying Amount of Land 1,847      
Carrying Amount of Buildings and Improvements 49,685      
Accumulated Depreciation $ 12,524      
Year Acquired Jan. 01, 2010      
Year Built Jan. 01, 1990      
Seniors Housing Operating [Member] | Dublin, OH, DUB2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,169      
Initial Cost of Buildings & Improvements 25,345      
Cost Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 1,169      
Carrying Amount of Buildings and Improvements 25,345      
Accumulated Depreciation $ 452      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 2015      
Seniors Housing Operating [Member] | East Haven, CT, ETH Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,660      
Initial Cost of Buildings & Improvements 35,533      
Cost Capitalized Subsequent to Acquisition 3,109      
Carrying Amount of Land 2,681      
Carrying Amount of Buildings and Improvements 38,621      
Accumulated Depreciation $ 11,385      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 2000      
Seniors Housing Operating [Member] | East Meadow, NY, EMD Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 69      
Initial Cost of Buildings & Improvements 45,991      
Cost Capitalized Subsequent to Acquisition 1,360      
Carrying Amount of Land 124      
Carrying Amount of Buildings and Improvements 47,296      
Accumulated Depreciation $ 8,545      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2002      
Seniors Housing Operating [Member] | East Setauket, NY, ESK Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 4,920      
Initial Cost of Buildings & Improvements 37,354      
Cost Capitalized Subsequent to Acquisition 1,349      
Carrying Amount of Land 4,975      
Carrying Amount of Buildings and Improvements 38,648      
Accumulated Depreciation $ 7,038      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2002      
Seniors Housing Operating [Member] | Eastbourne, UKJ, EBN Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 4,145      
Initial Cost of Buildings & Improvements 33,744      
Cost Capitalized Subsequent to Acquisition 3,892      
Carrying Amount of Land 4,557      
Carrying Amount of Buildings and Improvements 37,224      
Accumulated Depreciation $ 7,009      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2008      
Seniors Housing Operating [Member] | Edgbaston, UKG, EDB Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,720      
Initial Cost of Buildings & Improvements 13,969      
Cost Capitalized Subsequent to Acquisition 1,680      
Carrying Amount of Land 2,983      
Carrying Amount of Buildings and Improvements 15,386      
Accumulated Depreciation $ 1,130      
Year Acquired Jan. 01, 2014      
Year Built Jan. 01, 2015      
Seniors Housing Operating [Member] | Edgewater, NJ, EDG Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 4,561      
Initial Cost of Buildings & Improvements 25,047      
Cost Capitalized Subsequent to Acquisition 1,349      
Carrying Amount of Land 4,564      
Carrying Amount of Buildings and Improvements 26,393      
Accumulated Depreciation $ 5,108      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2000      
Seniors Housing Operating [Member] | Edison, NJ, EDS Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,892      
Initial Cost of Buildings & Improvements 32,314      
Cost Capitalized Subsequent to Acquisition 1,463      
Carrying Amount of Land 1,905      
Carrying Amount of Buildings and Improvements 33,764      
Accumulated Depreciation $ 8,522      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1996      
Seniors Housing Operating [Member] | Edmonds, WA, EDD Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,650      
Initial Cost of Buildings & Improvements 24,449      
Cost Capitalized Subsequent to Acquisition 2,665      
Carrying Amount of Land 1,651      
Carrying Amount of Buildings and Improvements 27,113      
Accumulated Depreciation $ 2,679      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1976      
Seniors Housing Operating [Member] | Edmonton, AB, EDT Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 9,439      
Initial Cost of Land 1,589      
Initial Cost of Buildings & Improvements 29,819      
Cost Capitalized Subsequent to Acquisition 3,890      
Carrying Amount of Land 1,778      
Carrying Amount of Buildings and Improvements 33,520      
Accumulated Depreciation $ 6,718      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Edmonton, AB, EDT2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 12,242      
Initial Cost of Land 2,063      
Initial Cost of Buildings & Improvements 37,293      
Cost Capitalized Subsequent to Acquisition 4,948      
Carrying Amount of Land 2,281      
Carrying Amount of Buildings and Improvements 42,023      
Accumulated Depreciation $ 10,604      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1968      
Seniors Housing Operating [Member] | Encinitas, CA, ENC Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,460      
Initial Cost of Buildings & Improvements 7,721      
Cost Capitalized Subsequent to Acquisition 2,946      
Carrying Amount of Land 1,460      
Carrying Amount of Buildings and Improvements 10,667      
Accumulated Depreciation $ 4,504      
Year Acquired Jan. 01, 2000      
Year Built Jan. 01, 1988      
Seniors Housing Operating [Member] | Encino, CA, ECN Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 5,040      
Initial Cost of Buildings & Improvements 46,255      
Cost Capitalized Subsequent to Acquisition 1,930      
Carrying Amount of Land 5,040      
Carrying Amount of Buildings and Improvements 48,185      
Accumulated Depreciation $ 9,720      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2003      
Seniors Housing Operating [Member] | Escondido, CA, ESC Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,520      
Initial Cost of Buildings & Improvements 24,024      
Cost Capitalized Subsequent to Acquisition 1,358      
Carrying Amount of Land 1,520      
Carrying Amount of Buildings and Improvements 25,382      
Accumulated Depreciation $ 6,200      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1987      
Seniors Housing Operating [Member] | Esher, UKJ, ESH Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 5,783      
Initial Cost of Buildings & Improvements 48,361      
Cost Capitalized Subsequent to Acquisition 5,320      
Carrying Amount of Land 6,346      
Carrying Amount of Buildings and Improvements 53,118      
Accumulated Depreciation $ 9,005      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2006      
Seniors Housing Operating [Member] | Fairfax, VA, FFX Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 19      
Initial Cost of Buildings & Improvements 2,678      
Cost Capitalized Subsequent to Acquisition 239      
Carrying Amount of Land 53      
Carrying Amount of Buildings and Improvements 2,883      
Accumulated Depreciation $ 822      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1991      
Seniors Housing Operating [Member] | Fairfield, NJ, FAF Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,120      
Initial Cost of Buildings & Improvements 43,868      
Cost Capitalized Subsequent to Acquisition 1,125      
Carrying Amount of Land 3,175      
Carrying Amount of Buildings and Improvements 44,937      
Accumulated Depreciation $ 8,407      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Fareham, UKJ, FRH Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,408      
Initial Cost of Buildings & Improvements 17,970      
Cost Capitalized Subsequent to Acquisition 2,324      
Carrying Amount of Land 3,743      
Carrying Amount of Buildings and Improvements 19,960      
Accumulated Depreciation $ 2,442      
Year Acquired Jan. 01, 2014      
Year Built Jan. 01, 2012      
Seniors Housing Operating [Member] | Flossmoor, IL, FLS Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,292      
Initial Cost of Buildings & Improvements 9,496      
Cost Capitalized Subsequent to Acquisition 1,633      
Carrying Amount of Land 1,339      
Carrying Amount of Buildings and Improvements 11,082      
Accumulated Depreciation $ 2,631      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2000      
Seniors Housing Operating [Member] | Folsom, CA, FSM Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,490      
Initial Cost of Buildings & Improvements 32,754      
Cost Capitalized Subsequent to Acquisition 37      
Carrying Amount of Land 1,490      
Carrying Amount of Buildings and Improvements 32,791      
Accumulated Depreciation $ 3,354      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2014      
Seniors Housing Operating [Member] | Fort Worth, TX, FWT3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,080      
Initial Cost of Buildings & Improvements 27,888      
Cost Capitalized Subsequent to Acquisition 3,638      
Carrying Amount of Land 2,093      
Carrying Amount of Buildings and Improvements 31,513      
Accumulated Depreciation $ 7,915      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2001      
Seniors Housing Operating [Member] | Fort Worth, TX, FWT8 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,740      
Initial Cost of Buildings & Improvements 19,799      
Cost Capitalized Subsequent to Acquisition 1,012      
Carrying Amount of Land 1,740      
Carrying Amount of Buildings and Improvements 20,811      
Accumulated Depreciation $ 1,610      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 2014      
Seniors Housing Operating [Member] | Franklin, MA, FKL Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,430      
Initial Cost of Buildings & Improvements 30,597      
Cost Capitalized Subsequent to Acquisition 2,484      
Carrying Amount of Land 2,458      
Carrying Amount of Buildings and Improvements 33,053      
Accumulated Depreciation $ 5,582      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Frome, UKK, FRO Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,720      
Initial Cost of Buildings & Improvements 14,813      
Cost Capitalized Subsequent to Acquisition 1,861      
Carrying Amount of Land 2,983      
Carrying Amount of Buildings and Improvements 16,411      
Accumulated Depreciation $ 1,747      
Year Acquired Jan. 01, 2014      
Year Built Jan. 01, 2012      
Seniors Housing Operating [Member] | Fullerton, CA, FUL Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,964      
Initial Cost of Buildings & Improvements 19,989      
Cost Capitalized Subsequent to Acquisition 837      
Carrying Amount of Land 1,998      
Carrying Amount of Buildings and Improvements 20,792      
Accumulated Depreciation $ 4,094      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2008      
Seniors Housing Operating [Member] | Gahanna, OH, GAH Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 772      
Initial Cost of Buildings & Improvements 11,214      
Cost Capitalized Subsequent to Acquisition 1,337      
Carrying Amount of Land 787      
Carrying Amount of Buildings and Improvements 12,537      
Accumulated Depreciation $ 2,302      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Gilbert, AZ, GLB Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 15,747      
Initial Cost of Land 2,160      
Initial Cost of Buildings & Improvements 28,246      
Cost Capitalized Subsequent to Acquisition 949      
Carrying Amount of Land 2,176      
Carrying Amount of Buildings and Improvements 29,179      
Accumulated Depreciation $ 7,465      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2008      
Seniors Housing Operating [Member] | Gilroy, CA, GIL Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 760      
Initial Cost of Buildings & Improvements 13,880      
Cost Capitalized Subsequent to Acquisition 24,812      
Carrying Amount of Land 1,578      
Carrying Amount of Buildings and Improvements 37,875      
Accumulated Depreciation $ 10,084      
Year Acquired Jan. 01, 2006      
Year Built Jan. 01, 2007      
Seniors Housing Operating [Member] | Glen Cove, NY, GLC Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 4,594      
Initial Cost of Buildings & Improvements 35,236      
Cost Capitalized Subsequent to Acquisition 1,661      
Carrying Amount of Land 4,634      
Carrying Amount of Buildings and Improvements 36,857      
Accumulated Depreciation $ 8,125      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Glenview, IL, GLV Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,090      
Initial Cost of Buildings & Improvements 69,288      
Cost Capitalized Subsequent to Acquisition 2,757      
Carrying Amount of Land 2,090      
Carrying Amount of Buildings and Improvements 72,045      
Accumulated Depreciation $ 13,683      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2001      
Seniors Housing Operating [Member] | Golden Valley, MN, GVY Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 19,022      
Initial Cost of Land 1,520      
Initial Cost of Buildings & Improvements 33,513      
Cost Capitalized Subsequent to Acquisition 1,126      
Carrying Amount of Land 1,545      
Carrying Amount of Buildings and Improvements 34,614      
Accumulated Depreciation $ 6,045      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2005      
Seniors Housing Operating [Member] | Granbury, TX, GRB2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,040      
Initial Cost of Buildings & Improvements 30,670      
Cost Capitalized Subsequent to Acquisition 502      
Carrying Amount of Land 2,040      
Carrying Amount of Buildings and Improvements 31,172      
Accumulated Depreciation $ 5,475      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Grimsby, ON, GRM Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 636      
Initial Cost of Buildings & Improvements 5,617      
Cost Capitalized Subsequent to Acquisition 803      
Carrying Amount of Land 708      
Carrying Amount of Buildings and Improvements 6,348      
Accumulated Depreciation $ 885      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1991      
Seniors Housing Operating [Member] | Grosse Pointe Woods, MI, GPW Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 950      
Initial Cost of Buildings & Improvements 13,662      
Cost Capitalized Subsequent to Acquisition 494      
Carrying Amount of Land 950      
Carrying Amount of Buildings and Improvements 14,156      
Accumulated Depreciation $ 2,422      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2006      
Seniors Housing Operating [Member] | Grosse Pointe Woods, MI, GPW2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,430      
Initial Cost of Buildings & Improvements 31,777      
Cost Capitalized Subsequent to Acquisition 962      
Carrying Amount of Land 1,435      
Carrying Amount of Buildings and Improvements 32,734      
Accumulated Depreciation $ 5,626      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2005      
Seniors Housing Operating [Member] | Guelph, ON, GUE2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 4,486      
Initial Cost of Land 1,190      
Initial Cost of Buildings & Improvements 7,597      
Cost Capitalized Subsequent to Acquisition 1,183      
Carrying Amount of Land 1,333      
Carrying Amount of Buildings and Improvements 8,638      
Accumulated Depreciation $ 1,432      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1978      
Seniors Housing Operating [Member] | Guildford, UKJ, GDF Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 5,361      
Initial Cost of Buildings & Improvements 56,494      
Cost Capitalized Subsequent to Acquisition 6,278      
Carrying Amount of Land 5,879      
Carrying Amount of Buildings and Improvements 62,254      
Accumulated Depreciation $ 10,783      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2006      
Seniors Housing Operating [Member] | Gurnee, IL, GUR Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 890      
Initial Cost of Buildings & Improvements 27,931      
Cost Capitalized Subsequent to Acquisition 1,900      
Carrying Amount of Land 935      
Carrying Amount of Buildings and Improvements 29,786      
Accumulated Depreciation $ 4,857      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2002      
Seniors Housing Operating [Member] | Hamden, CT, HMD2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,460      
Initial Cost of Buildings & Improvements 24,093      
Cost Capitalized Subsequent to Acquisition 1,698      
Carrying Amount of Land 1,487      
Carrying Amount of Buildings and Improvements 25,764      
Accumulated Depreciation $ 6,780      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Hampshire, UKJ, HMP Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 4,172      
Initial Cost of Buildings & Improvements 26,035      
Cost Capitalized Subsequent to Acquisition 3,010      
Carrying Amount of Land 4,584      
Carrying Amount of Buildings and Improvements 28,633      
Accumulated Depreciation $ 5,267      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2006      
Seniors Housing Operating [Member] | Haverhill, MA, HVH Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,720      
Initial Cost of Buildings & Improvements 50,046      
Cost Capitalized Subsequent to Acquisition 968      
Carrying Amount of Land 1,723      
Carrying Amount of Buildings and Improvements 51,010      
Accumulated Depreciation $ 6,411      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1997      
Seniors Housing Operating [Member] | Henderson, NV, HNR3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 880      
Initial Cost of Buildings & Improvements 29,809      
Cost Capitalized Subsequent to Acquisition 645      
Carrying Amount of Land 897      
Carrying Amount of Buildings and Improvements 30,437      
Accumulated Depreciation $ 5,605      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Henderson, NV, HNR4 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,190      
Initial Cost of Buildings & Improvements 11,600      
Cost Capitalized Subsequent to Acquisition 774      
Carrying Amount of Land 1,252      
Carrying Amount of Buildings and Improvements 12,312      
Accumulated Depreciation $ 3,374      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2008      
Seniors Housing Operating [Member] | High Wycombe, UKJ, HWB Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,784      
Initial Cost of Buildings & Improvements 14,191      
Cost Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 3,784      
Carrying Amount of Buildings and Improvements 14,191      
Accumulated Depreciation $ 241      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2017      
Seniors Housing Operating [Member] | Highland Park, IL, HDP2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,250      
Initial Cost of Buildings & Improvements 25,313      
Cost Capitalized Subsequent to Acquisition 1,223      
Carrying Amount of Land 2,265      
Carrying Amount of Buildings and Improvements 26,521      
Accumulated Depreciation $ 5,662      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2005      
Seniors Housing Operating [Member] | Hingham, MA, HGM Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,440      
Initial Cost of Buildings & Improvements 32,292      
Cost Capitalized Subsequent to Acquisition 176      
Carrying Amount of Land 1,440      
Carrying Amount of Buildings and Improvements 32,467      
Accumulated Depreciation $ 3,666      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2012      
Seniors Housing Operating [Member] | Holbrook, NY, HBK Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,957      
Initial Cost of Buildings & Improvements 35,337      
Cost Capitalized Subsequent to Acquisition 1,109      
Carrying Amount of Land 4,021      
Carrying Amount of Buildings and Improvements 36,382      
Accumulated Depreciation $ 6,615      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2001      
Seniors Housing Operating [Member] | Horley, UKJ, HLE Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,332      
Initial Cost of Buildings & Improvements 12,144      
Cost Capitalized Subsequent to Acquisition 1,521      
Carrying Amount of Land 2,565      
Carrying Amount of Buildings and Improvements 13,432      
Accumulated Depreciation $ 1,981      
Year Acquired Jan. 01, 2014      
Year Built Jan. 01, 2014      
Seniors Housing Operating [Member] | Houston, TX, HOU10 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,830      
Initial Cost of Buildings & Improvements 55,674      
Cost Capitalized Subsequent to Acquisition 6,489      
Carrying Amount of Land 3,830      
Carrying Amount of Buildings and Improvements 62,163      
Accumulated Depreciation $ 13,392      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Houston, TX, HOU11 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 16,922      
Initial Cost of Land 1,040      
Initial Cost of Buildings & Improvements 31,965      
Cost Capitalized Subsequent to Acquisition 5,561      
Carrying Amount of Land 1,049      
Carrying Amount of Buildings and Improvements 37,517      
Accumulated Depreciation $ 7,104      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Houston, TX, HOU12 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,750      
Initial Cost of Buildings & Improvements 15,603      
Cost Capitalized Subsequent to Acquisition 1,264      
Carrying Amount of Land 1,750      
Carrying Amount of Buildings and Improvements 16,867      
Accumulated Depreciation $ 738      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 2014      
Seniors Housing Operating [Member] | Huntington Beach, CA, HGB Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,808      
Initial Cost of Buildings & Improvements 31,172      
Cost Capitalized Subsequent to Acquisition 2,429      
Carrying Amount of Land 3,886      
Carrying Amount of Buildings and Improvements 33,523      
Accumulated Depreciation $ 7,290      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2004      
Seniors Housing Operating [Member] | Irving, TX, IRV Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,030      
Initial Cost of Buildings & Improvements 6,823      
Cost Capitalized Subsequent to Acquisition 1,508      
Carrying Amount of Land 1,030      
Carrying Amount of Buildings and Improvements 8,331      
Accumulated Depreciation $ 2,428      
Year Acquired Jan. 01, 2007      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Johns Creek, GA, JCR Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,580      
Initial Cost of Buildings & Improvements 23,285      
Cost Capitalized Subsequent to Acquisition 586      
Carrying Amount of Land 1,588      
Carrying Amount of Buildings and Improvements 23,863      
Accumulated Depreciation $ 4,448      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Kanata, ON, KNA Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,689      
Initial Cost of Buildings & Improvements 28,670      
Cost Capitalized Subsequent to Acquisition 2,642      
Carrying Amount of Land 1,812      
Carrying Amount of Buildings and Improvements 31,189      
Accumulated Depreciation $ 5,491      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2005      
Seniors Housing Operating [Member] | Kansas City, MO, KNS2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,820      
Initial Cost of Buildings & Improvements 34,898      
Cost Capitalized Subsequent to Acquisition 4,570      
Carrying Amount of Land 1,845      
Carrying Amount of Buildings and Improvements 39,443      
Accumulated Depreciation $ 10,363      
Year Acquired Jan. 01, 2010      
Year Built Jan. 01, 1980      
Seniors Housing Operating [Member] | Kansas City, MO, KNS3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 5,620      
Initial Cost of Land 1,930      
Initial Cost of Buildings & Improvements 39,997      
Cost Capitalized Subsequent to Acquisition 4,369      
Carrying Amount of Land 1,963      
Carrying Amount of Buildings and Improvements 44,333      
Accumulated Depreciation $ 11,808      
Year Acquired Jan. 01, 2010      
Year Built Jan. 01, 1986      
Seniors Housing Operating [Member] | Kansas City, MO, KNS6 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 541      
Initial Cost of Buildings & Improvements 23,962      
Cost Capitalized Subsequent to Acquisition 173      
Carrying Amount of Land 545      
Carrying Amount of Buildings and Improvements 24,131      
Accumulated Depreciation $ 2,418      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2014      
Seniors Housing Operating [Member] | Kelowna, BC, KEL Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 5,942      
Initial Cost of Land 2,688      
Initial Cost of Buildings & Improvements 13,647      
Cost Capitalized Subsequent to Acquisition 2,103      
Carrying Amount of Land 2,984      
Carrying Amount of Buildings and Improvements 15,453      
Accumulated Depreciation $ 3,689      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Kennebunk, ME, KBK Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,700      
Initial Cost of Buildings & Improvements 30,204      
Cost Capitalized Subsequent to Acquisition 4,739      
Carrying Amount of Land 3,200      
Carrying Amount of Buildings and Improvements 34,442      
Accumulated Depreciation $ 11,037      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2006      
Seniors Housing Operating [Member] | Kingston, ON, KST Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 4,767      
Initial Cost of Land 1,030      
Initial Cost of Buildings & Improvements 11,416      
Cost Capitalized Subsequent to Acquisition 1,637      
Carrying Amount of Land 1,154      
Carrying Amount of Buildings and Improvements 12,928      
Accumulated Depreciation $ 1,574      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1983      
Seniors Housing Operating [Member] | Kingwood, TX, KNG2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 480      
Initial Cost of Buildings & Improvements 9,777      
Cost Capitalized Subsequent to Acquisition 1,080      
Carrying Amount of Land 480      
Carrying Amount of Buildings and Improvements 10,857      
Accumulated Depreciation $ 2,524      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Kingwood, TX, KNG4 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,683      
Initial Cost of Buildings & Improvements 24,207      
Cost Capitalized Subsequent to Acquisition 2,448      
Carrying Amount of Land 1,683      
Carrying Amount of Buildings and Improvements 26,655      
Accumulated Depreciation $ 496      
Year Acquired Jan. 01, 2017      
Year Built Jan. 01, 2012      
Seniors Housing Operating [Member] | Kirkland, WA, KRK2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 24,600      
Initial Cost of Land 3,450      
Initial Cost of Buildings & Improvements 38,709      
Cost Capitalized Subsequent to Acquisition 848      
Carrying Amount of Land 3,515      
Carrying Amount of Buildings and Improvements 39,491      
Accumulated Depreciation $ 7,883      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Kitchener, ON, KCH Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 1,514      
Initial Cost of Land 708      
Initial Cost of Buildings & Improvements 2,744      
Cost Capitalized Subsequent to Acquisition 393      
Carrying Amount of Land 708      
Carrying Amount of Buildings and Improvements 3,138      
Accumulated Depreciation $ 727      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1979      
Seniors Housing Operating [Member] | Kitchener, ON, KCH2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 4,833      
Initial Cost of Land 1,130      
Initial Cost of Buildings & Improvements 9,939      
Cost Capitalized Subsequent to Acquisition 1,367      
Carrying Amount of Land 1,267      
Carrying Amount of Buildings and Improvements 11,169      
Accumulated Depreciation $ 2,307      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1988      
Seniors Housing Operating [Member] | Kitchener, ON, KCH3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 3,682      
Initial Cost of Land 1,093      
Initial Cost of Buildings & Improvements 7,327      
Cost Capitalized Subsequent to Acquisition 1,030      
Carrying Amount of Land 1,212      
Carrying Amount of Buildings and Improvements 8,239      
Accumulated Depreciation $ 2,164      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1964      
Seniors Housing Operating [Member] | Kitchener, ON, KCH4 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 13,681      
Initial Cost of Land 1,341      
Initial Cost of Buildings & Improvements 13,939      
Cost Capitalized Subsequent to Acquisition 4,064      
Carrying Amount of Land 1,443      
Carrying Amount of Buildings and Improvements 17,901      
Accumulated Depreciation $ 1,974      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 2003      
Seniors Housing Operating [Member] | La Palma, CA, LPM Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,950      
Initial Cost of Buildings & Improvements 16,591      
Cost Capitalized Subsequent to Acquisition 822      
Carrying Amount of Land 2,966      
Carrying Amount of Buildings and Improvements 17,398      
Accumulated Depreciation $ 3,346      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2003      
Seniors Housing Operating [Member] | Lafayette Hill, PA, LFH Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,750      
Initial Cost of Buildings & Improvements 11,848      
Cost Capitalized Subsequent to Acquisition 2,214      
Carrying Amount of Land 1,867      
Carrying Amount of Buildings and Improvements 13,945      
Accumulated Depreciation $ 3,430      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Laguna Hills, CA, LHL Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 12,820      
Initial Cost of Buildings & Improvements 75,926      
Cost Capitalized Subsequent to Acquisition 11,912      
Carrying Amount of Land 12,820      
Carrying Amount of Buildings and Improvements 87,838      
Accumulated Depreciation $ 6,020      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 1988      
Seniors Housing Operating [Member] | Laguna Woods, CA, LDS Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 11,280      
Initial Cost of Buildings & Improvements 76,485      
Cost Capitalized Subsequent to Acquisition 9,929      
Carrying Amount of Land 11,280      
Carrying Amount of Buildings and Improvements 86,414      
Accumulated Depreciation $ 6,754      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 1987      
Seniors Housing Operating [Member] | Laguna Woods, CA, LDS2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 9,150      
Initial Cost of Buildings & Improvements 57,842      
Cost Capitalized Subsequent to Acquisition 6,364      
Carrying Amount of Land 9,150      
Carrying Amount of Buildings and Improvements 64,206      
Accumulated Depreciation $ 5,550      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 1986      
Seniors Housing Operating [Member] | Lake Zurich, IL, LKZ Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,470      
Initial Cost of Buildings & Improvements 9,830      
Cost Capitalized Subsequent to Acquisition 2,940      
Carrying Amount of Land 1,470      
Carrying Amount of Buildings and Improvements 12,770      
Accumulated Depreciation $ 4,074      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 2007      
Seniors Housing Operating [Member] | Lawrenceville, GA, LWV3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,500      
Initial Cost of Buildings & Improvements 29,003      
Cost Capitalized Subsequent to Acquisition 677      
Carrying Amount of Land 1,508      
Carrying Amount of Buildings and Improvements 29,672      
Accumulated Depreciation $ 5,615      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2008      
Seniors Housing Operating [Member] | Leatherhead, UKJ, LTD Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 4,967      
Initial Cost of Buildings & Improvements 18,859      
Cost Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 4,967      
Carrying Amount of Buildings and Improvements 18,859      
Accumulated Depreciation $ 226      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2017      
Seniors Housing Operating [Member] | Leawood, KS, LEA Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 15,021      
Initial Cost of Land 2,490      
Initial Cost of Buildings & Improvements 32,493      
Cost Capitalized Subsequent to Acquisition 3,799      
Carrying Amount of Land 5,690      
Carrying Amount of Buildings and Improvements 33,091      
Accumulated Depreciation $ 7,993      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Lenexa, KS, LEN2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 9,396      
Initial Cost of Land 826      
Initial Cost of Buildings & Improvements 26,251      
Cost Capitalized Subsequent to Acquisition 947      
Carrying Amount of Land 850      
Carrying Amount of Buildings and Improvements 27,173      
Accumulated Depreciation $ 5,665      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2006      
Seniors Housing Operating [Member] | Leominster, MA, LMT3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 944      
Initial Cost of Buildings & Improvements 23,164      
Cost Capitalized Subsequent to Acquisition 647      
Carrying Amount of Land 992      
Carrying Amount of Buildings and Improvements 23,763      
Accumulated Depreciation $ 2,958      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Lincroft, NJ, LIN Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 9      
Initial Cost of Buildings & Improvements 19,958      
Cost Capitalized Subsequent to Acquisition 1,453      
Carrying Amount of Land 29      
Carrying Amount of Buildings and Improvements 21,391      
Accumulated Depreciation $ 3,979      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2002      
Seniors Housing Operating [Member] | Lombard, IL, LMB Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 16,297      
Initial Cost of Land 2,130      
Initial Cost of Buildings & Improvements 59,943      
Cost Capitalized Subsequent to Acquisition 1,390      
Carrying Amount of Land 2,147      
Carrying Amount of Buildings and Improvements 61,316      
Accumulated Depreciation $ 10,789      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | London, UKI, LDN Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,121      
Initial Cost of Buildings & Improvements 10,027      
Cost Capitalized Subsequent to Acquisition 1,459      
Carrying Amount of Land 3,428      
Carrying Amount of Buildings and Improvements 11,179      
Accumulated Depreciation $ 1,391      
Year Acquired Jan. 01, 2014      
Year Built Jan. 01, 2012      
Seniors Housing Operating [Member] | London, ON, LND2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 476      
Initial Cost of Land 987      
Initial Cost of Buildings & Improvements 8,228      
Cost Capitalized Subsequent to Acquisition 1,425      
Carrying Amount of Land 1,122      
Carrying Amount of Buildings and Improvements 9,517      
Accumulated Depreciation $ 1,321      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1989      
Seniors Housing Operating [Member] | London, ON, LND3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 12,381      
Initial Cost of Land 1,969      
Initial Cost of Buildings & Improvements 16,985      
Cost Capitalized Subsequent to Acquisition 2,873      
Carrying Amount of Land 2,177      
Carrying Amount of Buildings and Improvements 19,650      
Accumulated Depreciation $ 2,795      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1953      
Seniors Housing Operating [Member] | London, ON, LND4 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,445      
Initial Cost of Buildings & Improvements 13,631      
Cost Capitalized Subsequent to Acquisition 1,944      
Carrying Amount of Land 1,689      
Carrying Amount of Buildings and Improvements 15,331      
Accumulated Depreciation $ 1,917      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1950      
Seniors Housing Operating [Member] | Longueuil, QC, LGL2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 10,257      
Initial Cost of Land 3,992      
Initial Cost of Buildings & Improvements 23,711      
Cost Capitalized Subsequent to Acquisition 4,195      
Carrying Amount of Land 4,469      
Carrying Amount of Buildings and Improvements 27,428      
Accumulated Depreciation $ 3,623      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1989      
Seniors Housing Operating [Member] | Los Angeles, CA, LOA Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 0      
Initial Cost of Buildings & Improvements 11,430      
Cost Capitalized Subsequent to Acquisition 2,124      
Carrying Amount of Land 0      
Carrying Amount of Buildings and Improvements 13,554      
Accumulated Depreciation $ 3,397      
Year Acquired Jan. 01, 2008      
Year Built Jan. 01, 1971      
Seniors Housing Operating [Member] | Los Angeles, CA, LOA2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 61,460      
Initial Cost of Land 0      
Initial Cost of Buildings & Improvements 114,438      
Cost Capitalized Subsequent to Acquisition 1,908      
Carrying Amount of Land 0      
Carrying Amount of Buildings and Improvements 116,346      
Accumulated Depreciation $ 25,572      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Los Angeles, CA, LOA3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,540      
Initial Cost of Buildings & Improvements 19,007      
Cost Capitalized Subsequent to Acquisition 2,250      
Carrying Amount of Land 3,540      
Carrying Amount of Buildings and Improvements 21,257      
Accumulated Depreciation $ 4,179      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2001      
Seniors Housing Operating [Member] | Los Angeles, CA, LOA4 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 0      
Initial Cost of Buildings & Improvements 28,050      
Cost Capitalized Subsequent to Acquisition 1,960      
Carrying Amount of Land 0      
Carrying Amount of Buildings and Improvements 30,010      
Accumulated Depreciation $ 2,169      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 2006      
Seniors Housing Operating [Member] | Louisville, KY, LOU3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,420      
Initial Cost of Buildings & Improvements 20,816      
Cost Capitalized Subsequent to Acquisition 1,505      
Carrying Amount of Land 2,420      
Carrying Amount of Buildings and Improvements 22,321      
Accumulated Depreciation $ 4,614      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Louisville, KY, LOU4 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 10,775      
Initial Cost of Land 1,600      
Initial Cost of Buildings & Improvements 20,326      
Cost Capitalized Subsequent to Acquisition 647      
Carrying Amount of Land 1,600      
Carrying Amount of Buildings and Improvements 20,973      
Accumulated Depreciation $ 4,334      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2010      
Seniors Housing Operating [Member] | Lynnfield, MA, LYN Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,165      
Initial Cost of Buildings & Improvements 45,200      
Cost Capitalized Subsequent to Acquisition 2,027      
Carrying Amount of Land 3,165      
Carrying Amount of Buildings and Improvements 47,226      
Accumulated Depreciation $ 8,848      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2006      
Seniors Housing Operating [Member] | Malvern, PA, MVN Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,651      
Initial Cost of Buildings & Improvements 17,194      
Cost Capitalized Subsequent to Acquisition 1,803      
Carrying Amount of Land 1,739      
Carrying Amount of Buildings and Improvements 18,910      
Accumulated Depreciation $ 4,875      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Mansfield, MA, MAS Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,320      
Initial Cost of Buildings & Improvements 57,011      
Cost Capitalized Subsequent to Acquisition 8,265      
Carrying Amount of Land 3,447      
Carrying Amount of Buildings and Improvements 65,149      
Accumulated Depreciation $ 15,871      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Maple Ridge, BC, MPR Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 9,158      
Initial Cost of Land 2,875      
Initial Cost of Buildings & Improvements 11,922      
Cost Capitalized Subsequent to Acquisition 1,158      
Carrying Amount of Land 3,095      
Carrying Amount of Buildings and Improvements 12,860      
Accumulated Depreciation $ 1,306      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Marieville, QC, MVI Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 7,008      
Initial Cost of Land 1,278      
Initial Cost of Buildings & Improvements 12,113      
Cost Capitalized Subsequent to Acquisition 1,138      
Carrying Amount of Land 1,419      
Carrying Amount of Buildings and Improvements 13,110      
Accumulated Depreciation $ 1,453      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2002      
Seniors Housing Operating [Member] | Markham, ON, MKH Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 41,037      
Initial Cost of Land 3,727      
Initial Cost of Buildings & Improvements 48,939      
Cost Capitalized Subsequent to Acquisition 6,060      
Carrying Amount of Land 4,161      
Carrying Amount of Buildings and Improvements 54,564      
Accumulated Depreciation $ 13,923      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1981      
Seniors Housing Operating [Member] | Marlboro, NJ, MBO Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,222      
Initial Cost of Buildings & Improvements 14,888      
Cost Capitalized Subsequent to Acquisition 1,058      
Carrying Amount of Land 2,250      
Carrying Amount of Buildings and Improvements 15,918      
Accumulated Depreciation $ 3,273      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2002      
Seniors Housing Operating [Member] | Medicine Hat, AB, MEH2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 11,543      
Initial Cost of Land 1,432      
Initial Cost of Buildings & Improvements 14,141      
Cost Capitalized Subsequent to Acquisition 1,390      
Carrying Amount of Land 1,591      
Carrying Amount of Buildings and Improvements 15,372      
Accumulated Depreciation $ 2,746      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Melbourne, FL, MEL Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 7,070      
Initial Cost of Buildings & Improvements 48,257      
Cost Capitalized Subsequent to Acquisition 28,853      
Carrying Amount of Land 7,070      
Carrying Amount of Buildings and Improvements 77,110      
Accumulated Depreciation $ 14,328      
Year Acquired Jan. 01, 2007      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Memphis, TN, MPS5 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,800      
Initial Cost of Buildings & Improvements 17,744      
Cost Capitalized Subsequent to Acquisition 1,477      
Carrying Amount of Land 1,800      
Carrying Amount of Buildings and Improvements 19,221      
Accumulated Depreciation $ 4,957      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Meriden, CT, MEI Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,500      
Initial Cost of Buildings & Improvements 14,874      
Cost Capitalized Subsequent to Acquisition 1,103      
Carrying Amount of Land 1,538      
Carrying Amount of Buildings and Improvements 15,940      
Accumulated Depreciation $ 5,185      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 2001      
Seniors Housing Operating [Member] | Metairie, LA, MET Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 12,773      
Initial Cost of Land 725      
Initial Cost of Buildings & Improvements 27,708      
Cost Capitalized Subsequent to Acquisition 663      
Carrying Amount of Land 725      
Carrying Amount of Buildings and Improvements 28,372      
Accumulated Depreciation $ 4,812      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Middletown, CT, MIN Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,430      
Initial Cost of Buildings & Improvements 24,242      
Cost Capitalized Subsequent to Acquisition 1,487      
Carrying Amount of Land 1,441      
Carrying Amount of Buildings and Improvements 25,717      
Accumulated Depreciation $ 6,965      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Middletown, RI, MIT Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,480      
Initial Cost of Buildings & Improvements 24,628      
Cost Capitalized Subsequent to Acquisition 1,777      
Carrying Amount of Land 2,511      
Carrying Amount of Buildings and Improvements 26,373      
Accumulated Depreciation $ 7,065      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Milford, CT, MIF Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,210      
Initial Cost of Buildings & Improvements 17,364      
Cost Capitalized Subsequent to Acquisition 1,835      
Carrying Amount of Land 3,233      
Carrying Amount of Buildings and Improvements 19,176      
Accumulated Depreciation $ 5,738      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Milton, ON, MTO Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 15,391      
Initial Cost of Land 4,542      
Initial Cost of Buildings & Improvements 25,321      
Cost Capitalized Subsequent to Acquisition 4,512      
Carrying Amount of Land 5,039      
Carrying Amount of Buildings and Improvements 29,335      
Accumulated Depreciation $ 3,036      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2012      
Seniors Housing Operating [Member] | Minnetonka, MN, MTK Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 13,654      
Initial Cost of Land 2,080      
Initial Cost of Buildings & Improvements 24,360      
Cost Capitalized Subsequent to Acquisition 2,289      
Carrying Amount of Land 2,376      
Carrying Amount of Buildings and Improvements 26,353      
Accumulated Depreciation $ 5,430      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Minnetonka, MN, MTK2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 15,651      
Initial Cost of Land 920      
Initial Cost of Buildings & Improvements 29,344      
Cost Capitalized Subsequent to Acquisition 803      
Carrying Amount of Land 954      
Carrying Amount of Buildings and Improvements 30,112      
Accumulated Depreciation $ 5,056      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2006      
Seniors Housing Operating [Member] | Mission Viejo, CA, MVJ Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 14,118      
Initial Cost of Land 6,600      
Initial Cost of Buildings & Improvements 52,118      
Cost Capitalized Subsequent to Acquisition 5,565      
Carrying Amount of Land 6,600      
Carrying Amount of Buildings and Improvements 57,683      
Accumulated Depreciation $ 4,621      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Mississauga, ON, MSS Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 9,409      
Initial Cost of Land 1,602      
Initial Cost of Buildings & Improvements 17,996      
Cost Capitalized Subsequent to Acquisition 2,334      
Carrying Amount of Land 1,771      
Carrying Amount of Buildings and Improvements 20,161      
Accumulated Depreciation $ 4,016      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1984      
Seniors Housing Operating [Member] | Mississauga, ON, MSS2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 3,169      
Initial Cost of Land 873      
Initial Cost of Buildings & Improvements 4,655      
Cost Capitalized Subsequent to Acquisition 728      
Carrying Amount of Land 966      
Carrying Amount of Buildings and Improvements 5,290      
Accumulated Depreciation $ 1,091      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1978      
Seniors Housing Operating [Member] | Mississauga, ON, MSS3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 30,008      
Initial Cost of Land 3,649      
Initial Cost of Buildings & Improvements 35,137      
Cost Capitalized Subsequent to Acquisition 4,715      
Carrying Amount of Land 4,053      
Carrying Amount of Buildings and Improvements 39,449      
Accumulated Depreciation $ 7,892      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1988      
Seniors Housing Operating [Member] | Mississauga, ON, MSS4 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 6,471      
Initial Cost of Land 2,548      
Initial Cost of Buildings & Improvements 15,158      
Cost Capitalized Subsequent to Acquisition 3,195      
Carrying Amount of Land 2,817      
Carrying Amount of Buildings and Improvements 18,085      
Accumulated Depreciation $ 2,977      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1989      
Seniors Housing Operating [Member] | Mobberley, UKD, MBB Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 5,146      
Initial Cost of Buildings & Improvements 26,665      
Cost Capitalized Subsequent to Acquisition 3,417      
Carrying Amount of Land 5,654      
Carrying Amount of Buildings and Improvements 29,573      
Accumulated Depreciation $ 6,980      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2007      
Seniors Housing Operating [Member] | Monterey, CA, MTY Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 6,440      
Initial Cost of Buildings & Improvements 29,101      
Cost Capitalized Subsequent to Acquisition 942      
Carrying Amount of Land 6,440      
Carrying Amount of Buildings and Improvements 30,043      
Accumulated Depreciation $ 5,624      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Montgomery Village, MD, MVG Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,530      
Initial Cost of Buildings & Improvements 18,246      
Cost Capitalized Subsequent to Acquisition 6,448      
Carrying Amount of Land 4,187      
Carrying Amount of Buildings and Improvements 24,037      
Accumulated Depreciation $ 7,944      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1993      
Seniors Housing Operating [Member] | Moose Jaw, SK, MJW Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 2,476      
Initial Cost of Land 582      
Initial Cost of Buildings & Improvements 12,973      
Cost Capitalized Subsequent to Acquisition 1,925      
Carrying Amount of Land 643      
Carrying Amount of Buildings and Improvements 14,837      
Accumulated Depreciation $ 2,931      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2001      
Seniors Housing Operating [Member] | Murphy, TX, MPH Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,950      
Initial Cost of Buildings & Improvements 19,182      
Cost Capitalized Subsequent to Acquisition 778      
Carrying Amount of Land 1,950      
Carrying Amount of Buildings and Improvements 19,960      
Accumulated Depreciation $ 1,214      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2012      
Seniors Housing Operating [Member] | Mystic, CT, MYS Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,400      
Initial Cost of Buildings & Improvements 18,274      
Cost Capitalized Subsequent to Acquisition 954      
Carrying Amount of Land 1,427      
Carrying Amount of Buildings and Improvements 19,201      
Accumulated Depreciation $ 5,096      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 2001      
Seniors Housing Operating [Member] | Naperville, IL, NPR3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,550      
Initial Cost of Buildings & Improvements 12,237      
Cost Capitalized Subsequent to Acquisition 2,283      
Carrying Amount of Land 1,550      
Carrying Amount of Buildings and Improvements 14,520      
Accumulated Depreciation $ 3,380      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2013      
Seniors Housing Operating [Member] | Naperville, IL, NPR4 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,540      
Initial Cost of Buildings & Improvements 28,204      
Cost Capitalized Subsequent to Acquisition 1,178      
Carrying Amount of Land 1,546      
Carrying Amount of Buildings and Improvements 29,377      
Accumulated Depreciation $ 5,687      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2002      
Seniors Housing Operating [Member] | Naples, FL, NPL3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 57,022      
Initial Cost of Land 8,989      
Initial Cost of Buildings & Improvements 119,398      
Cost Capitalized Subsequent to Acquisition 4,088      
Carrying Amount of Land 9,074      
Carrying Amount of Buildings and Improvements 123,401      
Accumulated Depreciation $ 15,758      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2000      
Seniors Housing Operating [Member] | Nashua, NH, NSH Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,264      
Initial Cost of Buildings & Improvements 43,026      
Cost Capitalized Subsequent to Acquisition 611      
Carrying Amount of Land 1,264      
Carrying Amount of Buildings and Improvements 43,637      
Accumulated Depreciation $ 4,311      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Nashville, TN, NSV5 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,900      
Initial Cost of Buildings & Improvements 35,788      
Cost Capitalized Subsequent to Acquisition 2,198      
Carrying Amount of Land 3,900      
Carrying Amount of Buildings and Improvements 37,986      
Accumulated Depreciation $ 9,120      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Needham, MA, NED3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,240      
Initial Cost of Buildings & Improvements 32,992      
Cost Capitalized Subsequent to Acquisition 1,186      
Carrying Amount of Land 1,240      
Carrying Amount of Buildings and Improvements 34,178      
Accumulated Depreciation $ 1,952      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 2011      
Seniors Housing Operating [Member] | Nepean, ON, NPN Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 6,045      
Initial Cost of Land 1,575      
Initial Cost of Buildings & Improvements 5,770      
Cost Capitalized Subsequent to Acquisition 1,038      
Carrying Amount of Land 1,757      
Carrying Amount of Buildings and Improvements 6,626      
Accumulated Depreciation $ 1,377      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1988      
Seniors Housing Operating [Member] | New Braunfels, TX, NBR Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,200      
Initial Cost of Buildings & Improvements 19,800      
Cost Capitalized Subsequent to Acquisition 10,296      
Carrying Amount of Land 2,729      
Carrying Amount of Buildings and Improvements 28,567      
Accumulated Depreciation $ 4,142      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Newbury, UKJ, NWY Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,850      
Initial Cost of Buildings & Improvements 12,796      
Cost Capitalized Subsequent to Acquisition 1,591      
Carrying Amount of Land 3,125      
Carrying Amount of Buildings and Improvements 14,111      
Accumulated Depreciation $ 467      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2016      
Seniors Housing Operating [Member] | Newburyport, MA, NBP2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,750      
Initial Cost of Buildings & Improvements 29,187      
Cost Capitalized Subsequent to Acquisition 1,162      
Carrying Amount of Land 1,750      
Carrying Amount of Buildings and Improvements 30,350      
Accumulated Depreciation $ 1,855      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 2015      
Seniors Housing Operating [Member] | Newmarket, UKH, NWM Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 4,071      
Initial Cost of Buildings & Improvements 11,902      
Cost Capitalized Subsequent to Acquisition 1,806      
Carrying Amount of Land 4,471      
Carrying Amount of Buildings and Improvements 13,308      
Accumulated Depreciation $ 1,702      
Year Acquired Jan. 01, 2014      
Year Built Jan. 01, 2011      
Seniors Housing Operating [Member] | Newton, MA, NEW Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,250      
Initial Cost of Buildings & Improvements 43,614      
Cost Capitalized Subsequent to Acquisition 1,116      
Carrying Amount of Land 2,263      
Carrying Amount of Buildings and Improvements 44,717      
Accumulated Depreciation $ 10,785      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1996      
Seniors Housing Operating [Member] | Newton, MA, NEW2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 15,227      
Initial Cost of Land 2,500      
Initial Cost of Buildings & Improvements 30,681      
Cost Capitalized Subsequent to Acquisition 2,367      
Carrying Amount of Land 2,521      
Carrying Amount of Buildings and Improvements 33,027      
Accumulated Depreciation $ 8,396      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1996      
Seniors Housing Operating [Member] | Newton, MA, NEW3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,360      
Initial Cost of Buildings & Improvements 25,099      
Cost Capitalized Subsequent to Acquisition 1,618      
Carrying Amount of Land 3,385      
Carrying Amount of Buildings and Improvements 26,692      
Accumulated Depreciation $ 7,199      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1994      
Seniors Housing Operating [Member] | Newtown Square, PA, NTS Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,930      
Initial Cost of Buildings & Improvements 14,420      
Cost Capitalized Subsequent to Acquisition 1,041      
Carrying Amount of Land 1,941      
Carrying Amount of Buildings and Improvements 15,450      
Accumulated Depreciation $ 4,093      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2004      
Seniors Housing Operating [Member] | Niagara Falls, ON, NFL Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 7,109      
Initial Cost of Land 1,225      
Initial Cost of Buildings & Improvements 7,963      
Cost Capitalized Subsequent to Acquisition 1,272      
Carrying Amount of Land 1,355      
Carrying Amount of Buildings and Improvements 9,105      
Accumulated Depreciation $ 1,340      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1991      
Seniors Housing Operating [Member] | Niantic, CT, NIA Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,320      
Initial Cost of Buildings & Improvements 25,986      
Cost Capitalized Subsequent to Acquisition 4,432      
Carrying Amount of Land 1,334      
Carrying Amount of Buildings and Improvements 30,404      
Accumulated Depreciation $ 6,405      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 2001      
Seniors Housing Operating [Member] | North Andover, MA, NAN Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,960      
Initial Cost of Buildings & Improvements 34,976      
Cost Capitalized Subsequent to Acquisition 1,780      
Carrying Amount of Land 2,092      
Carrying Amount of Buildings and Improvements 36,624      
Accumulated Depreciation $ 8,965      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1995      
Seniors Housing Operating [Member] | North Chelmsford, MA, CHM2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 880      
Initial Cost of Buildings & Improvements 18,478      
Cost Capitalized Subsequent to Acquisition 935      
Carrying Amount of Land 951      
Carrying Amount of Buildings and Improvements 19,342      
Accumulated Depreciation $ 4,544      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | North Dartmouth, MA, DTM Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,700      
Initial Cost of Buildings & Improvements 35,337      
Cost Capitalized Subsequent to Acquisition 1,628      
Carrying Amount of Land 1,700      
Carrying Amount of Buildings and Improvements 36,965      
Accumulated Depreciation $ 2,298      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 1997      
Seniors Housing Operating [Member] | North Tustin, CA, NTT Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,880      
Initial Cost of Buildings & Improvements 18,059      
Cost Capitalized Subsequent to Acquisition 825      
Carrying Amount of Land 2,975      
Carrying Amount of Buildings and Improvements 18,788      
Accumulated Depreciation $ 3,056      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2000      
Seniors Housing Operating [Member] | Oak Park, IL, OKP Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,250      
Initial Cost of Buildings & Improvements 40,383      
Cost Capitalized Subsequent to Acquisition 1,496      
Carrying Amount of Land 1,250      
Carrying Amount of Buildings and Improvements 41,879      
Accumulated Depreciation $ 8,350      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2004      
Seniors Housing Operating [Member] | Oakland, CA, OAK Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,877      
Initial Cost of Buildings & Improvements 47,508      
Cost Capitalized Subsequent to Acquisition 2,965      
Carrying Amount of Land 3,901      
Carrying Amount of Buildings and Improvements 50,449      
Accumulated Depreciation $ 9,458      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Oakton, VA, OKN Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,250      
Initial Cost of Buildings & Improvements 37,576      
Cost Capitalized Subsequent to Acquisition 1,983      
Carrying Amount of Land 2,300      
Carrying Amount of Buildings and Improvements 39,509      
Accumulated Depreciation $ 7,200      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1997      
Seniors Housing Operating [Member] | Oakville, ON, OKV Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 6,158      
Initial Cost of Land 1,252      
Initial Cost of Buildings & Improvements 7,382      
Cost Capitalized Subsequent to Acquisition 996      
Carrying Amount of Land 1,392      
Carrying Amount of Buildings and Improvements 8,239      
Accumulated Depreciation $ 1,733      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1982      
Seniors Housing Operating [Member] | Oakville, ON, OKV2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 10,439      
Initial Cost of Land 2,134      
Initial Cost of Buildings & Improvements 29,963      
Cost Capitalized Subsequent to Acquisition 4,098      
Carrying Amount of Land 2,363      
Carrying Amount of Buildings and Improvements 33,832      
Accumulated Depreciation $ 7,199      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1994      
Seniors Housing Operating [Member] | Oakville, ON, OKV3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 5,462      
Initial Cost of Land 1,271      
Initial Cost of Buildings & Improvements 13,754      
Cost Capitalized Subsequent to Acquisition 1,924      
Carrying Amount of Land 1,405      
Carrying Amount of Buildings and Improvements 15,543      
Accumulated Depreciation $ 2,791      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1988      
Seniors Housing Operating [Member] | Oceanside, CA, OSD Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,160      
Initial Cost of Buildings & Improvements 18,352      
Cost Capitalized Subsequent to Acquisition 3,776      
Carrying Amount of Land 2,210      
Carrying Amount of Buildings and Improvements 22,078      
Accumulated Depreciation $ 5,314      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 2005      
Seniors Housing Operating [Member] | Okotoks, AB, OKO Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 19,493      
Initial Cost of Land 714      
Initial Cost of Buildings & Improvements 20,943      
Cost Capitalized Subsequent to Acquisition 2,475      
Carrying Amount of Land 789      
Carrying Amount of Buildings and Improvements 23,342      
Accumulated Depreciation $ 3,412      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2010      
Seniors Housing Operating [Member] | Oshawa, ON, OHW Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 3,144      
Initial Cost of Land 841      
Initial Cost of Buildings & Improvements 7,570      
Cost Capitalized Subsequent to Acquisition 1,252      
Carrying Amount of Land 963      
Carrying Amount of Buildings and Improvements 8,700      
Accumulated Depreciation $ 1,774      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1991      
Seniors Housing Operating [Member] | Ottawa, ON, NPN2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 10,658      
Initial Cost of Land 1,341      
Initial Cost of Buildings & Improvements 15,425      
Cost Capitalized Subsequent to Acquisition 2,752      
Carrying Amount of Land 1,520      
Carrying Amount of Buildings and Improvements 17,998      
Accumulated Depreciation $ 1,930      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2001      
Seniors Housing Operating [Member] | Ottawa, ON, OTT10 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 19,984      
Initial Cost of Land 3,454      
Initial Cost of Buildings & Improvements 23,309      
Cost Capitalized Subsequent to Acquisition 3,639      
Carrying Amount of Land 3,872      
Carrying Amount of Buildings and Improvements 26,530      
Accumulated Depreciation $ 6,517      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1966      
Seniors Housing Operating [Member] | Ottawa, ON, OTT11 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 22,945      
Initial Cost of Land 4,305      
Initial Cost of Buildings & Improvements 39,106      
Cost Capitalized Subsequent to Acquisition 3,494      
Carrying Amount of Land 4,632      
Carrying Amount of Buildings and Improvements 42,274      
Accumulated Depreciation $ 5,449      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2005      
Seniors Housing Operating [Member] | Ottawa, ON, OTT12 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 7,940      
Initial Cost of Land 2,103      
Initial Cost of Buildings & Improvements 18,421      
Cost Capitalized Subsequent to Acquisition 4,560      
Carrying Amount of Land 2,345      
Carrying Amount of Buildings and Improvements 22,739      
Accumulated Depreciation $ 2,719      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1989      
Seniors Housing Operating [Member] | Ottawa, ON, OTT13 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 15,092      
Initial Cost of Land 2,963      
Initial Cost of Buildings & Improvements 26,424      
Cost Capitalized Subsequent to Acquisition 4,480      
Carrying Amount of Land 3,294      
Carrying Amount of Buildings and Improvements 30,571      
Accumulated Depreciation $ 3,225      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2008      
Seniors Housing Operating [Member] | Ottawa, ON, OTT14 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 11,412      
Initial Cost of Land 1,561      
Initial Cost of Buildings & Improvements 18,170      
Cost Capitalized Subsequent to Acquisition 2,770      
Carrying Amount of Land 1,762      
Carrying Amount of Buildings and Improvements 20,738      
Accumulated Depreciation $ 2,116      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2006      
Seniors Housing Operating [Member] | Ottawa, ON, OTT15 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 14,405      
Initial Cost of Land 3,403      
Initial Cost of Buildings & Improvements 31,090      
Cost Capitalized Subsequent to Acquisition 4,983      
Carrying Amount of Land 3,775      
Carrying Amount of Buildings and Improvements 35,702      
Accumulated Depreciation $ 3,631      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Ottawa, ON, OTT16 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 19,417      
Initial Cost of Land 3,411      
Initial Cost of Buildings & Improvements 28,335      
Cost Capitalized Subsequent to Acquisition 7,128      
Carrying Amount of Land 3,799      
Carrying Amount of Buildings and Improvements 35,075      
Accumulated Depreciation $ 4,910      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Ottawa, ON, OTT4 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 3,112      
Initial Cost of Land 724      
Initial Cost of Buildings & Improvements 4,710      
Cost Capitalized Subsequent to Acquisition 705      
Carrying Amount of Land 801      
Carrying Amount of Buildings and Improvements 5,339      
Accumulated Depreciation $ 1,122      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1995      
Seniors Housing Operating [Member] | Ottawa, ON, OTT5 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 2,266      
Initial Cost of Land 818      
Initial Cost of Buildings & Improvements 2,165      
Cost Capitalized Subsequent to Acquisition 1,502      
Carrying Amount of Land 753      
Carrying Amount of Buildings and Improvements 3,732      
Accumulated Depreciation $ 853      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1993      
Seniors Housing Operating [Member] | Ottawa, ON, OTT6 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 10,914      
Initial Cost of Land 2,809      
Initial Cost of Buildings & Improvements 27,299      
Cost Capitalized Subsequent to Acquisition 3,891      
Carrying Amount of Land 3,109      
Carrying Amount of Buildings and Improvements 30,890      
Accumulated Depreciation $ 7,089      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Ottawa, ON, OTT7 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 4,994      
Initial Cost of Land 1,156      
Initial Cost of Buildings & Improvements 9,758      
Cost Capitalized Subsequent to Acquisition 1,408      
Carrying Amount of Land 1,336      
Carrying Amount of Buildings and Improvements 10,987      
Accumulated Depreciation $ 2,038      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Ottawa, ON, OTT8 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 6,500      
Initial Cost of Land 746      
Initial Cost of Buildings & Improvements 7,800      
Cost Capitalized Subsequent to Acquisition 1,211      
Carrying Amount of Land 831      
Carrying Amount of Buildings and Improvements 8,926      
Accumulated Depreciation $ 1,739      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Ottawa, ON, OTT9 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 9,796      
Initial Cost of Land 1,176      
Initial Cost of Buildings & Improvements 12,764      
Cost Capitalized Subsequent to Acquisition 1,941      
Carrying Amount of Land 1,320      
Carrying Amount of Buildings and Improvements 14,560      
Accumulated Depreciation $ 1,649      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1987      
Seniors Housing Operating [Member] | Overland Park, KS, OVP4 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 3,336      
Initial Cost of Land 1,540      
Initial Cost of Buildings & Improvements 16,269      
Cost Capitalized Subsequent to Acquisition 1,331      
Carrying Amount of Land 1,728      
Carrying Amount of Buildings and Improvements 17,413      
Accumulated Depreciation $ 3,549      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Palo Alto, CA, PAO Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 16,217      
Initial Cost of Land 0      
Initial Cost of Buildings & Improvements 39,639      
Cost Capitalized Subsequent to Acquisition 2,696      
Carrying Amount of Land 24      
Carrying Amount of Buildings and Improvements 42,311      
Accumulated Depreciation $ 7,559      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2007      
Seniors Housing Operating [Member] | Paramus, NJ, PAM Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,840      
Initial Cost of Buildings & Improvements 35,728      
Cost Capitalized Subsequent to Acquisition 1,566      
Carrying Amount of Land 2,903      
Carrying Amount of Buildings and Improvements 37,231      
Accumulated Depreciation $ 6,566      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Parkland, FL, PKL Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 56,604      
Initial Cost of Land 4,880      
Initial Cost of Buildings & Improvements 111,481      
Cost Capitalized Subsequent to Acquisition 3,276      
Carrying Amount of Land 4,885      
Carrying Amount of Buildings and Improvements 114,751      
Accumulated Depreciation $ 15,436      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2000      
Seniors Housing Operating [Member] | Peabody, MA, PBD2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 6,117      
Initial Cost of Land 2,250      
Initial Cost of Buildings & Improvements 16,071      
Cost Capitalized Subsequent to Acquisition 995      
Carrying Amount of Land 2,324      
Carrying Amount of Buildings and Improvements 16,992      
Accumulated Depreciation $ 2,353      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1994      
Seniors Housing Operating [Member] | Pembroke, ON, PBK Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,931      
Initial Cost of Buildings & Improvements 9,427      
Cost Capitalized Subsequent to Acquisition 1,075      
Carrying Amount of Land 2,071      
Carrying Amount of Buildings and Improvements 10,362      
Accumulated Depreciation $ 1,804      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Pittsburgh, PA, PSB2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,580      
Initial Cost of Buildings & Improvements 18,017      
Cost Capitalized Subsequent to Acquisition 807      
Carrying Amount of Land 1,587      
Carrying Amount of Buildings and Improvements 18,817      
Accumulated Depreciation $ 3,881      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Placentia, CA, PLC2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 8,480      
Initial Cost of Buildings & Improvements 17,076      
Cost Capitalized Subsequent to Acquisition 2,448      
Carrying Amount of Land 8,480      
Carrying Amount of Buildings and Improvements 19,525      
Accumulated Depreciation $ 2,402      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 1987      
Seniors Housing Operating [Member] | Plainview, NY, PLV2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,066      
Initial Cost of Buildings & Improvements 19,901      
Cost Capitalized Subsequent to Acquisition 764      
Carrying Amount of Land 3,182      
Carrying Amount of Buildings and Improvements 20,549      
Accumulated Depreciation $ 3,521      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2001      
Seniors Housing Operating [Member] | Plano, TX, PLO5 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 27,671      
Initial Cost of Land 3,120      
Initial Cost of Buildings & Improvements 59,950      
Cost Capitalized Subsequent to Acquisition 2,205      
Carrying Amount of Land 3,173      
Carrying Amount of Buildings and Improvements 62,102      
Accumulated Depreciation $ 14,899      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2006      
Seniors Housing Operating [Member] | Plano, TX, PLO7 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,750      
Initial Cost of Buildings & Improvements 15,390      
Cost Capitalized Subsequent to Acquisition 1,660      
Carrying Amount of Land 1,750      
Carrying Amount of Buildings and Improvements 17,051      
Accumulated Depreciation $ 1,053      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 2014      
Seniors Housing Operating [Member] | Playa Vista, CA, PYV Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,580      
Initial Cost of Buildings & Improvements 40,531      
Cost Capitalized Subsequent to Acquisition 1,029      
Carrying Amount of Land 1,605      
Carrying Amount of Buildings and Improvements 41,536      
Accumulated Depreciation $ 7,854      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2006      
Seniors Housing Operating [Member] | Plymouth, MA, PLY3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,444      
Initial Cost of Buildings & Improvements 34,951      
Cost Capitalized Subsequent to Acquisition 697      
Carrying Amount of Land 1,444      
Carrying Amount of Buildings and Improvements 35,648      
Accumulated Depreciation $ 4,039      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Plymouth, MA, PLY4 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 13,462      
Initial Cost of Land 2,550      
Initial Cost of Buildings & Improvements 35,055      
Cost Capitalized Subsequent to Acquisition 2,123      
Carrying Amount of Land 2,550      
Carrying Amount of Buildings and Improvements 37,178      
Accumulated Depreciation $ 2,440      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 1970      
Seniors Housing Operating [Member] | Port Perry, ON, PPY Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 9,905      
Initial Cost of Land 3,685      
Initial Cost of Buildings & Improvements 26,788      
Cost Capitalized Subsequent to Acquisition 5,059      
Carrying Amount of Land 4,079      
Carrying Amount of Buildings and Improvements 31,453      
Accumulated Depreciation $ 2,988      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Port St. Lucie, FL, PSL Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 8,700      
Initial Cost of Buildings & Improvements 47,230      
Cost Capitalized Subsequent to Acquisition 20,372      
Carrying Amount of Land 8,700      
Carrying Amount of Buildings and Improvements 67,602      
Accumulated Depreciation $ 11,380      
Year Acquired Jan. 01, 2008      
Year Built Jan. 01, 2010      
Seniors Housing Operating [Member] | Providence, RI, PRO Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,655      
Initial Cost of Buildings & Improvements 21,910      
Cost Capitalized Subsequent to Acquisition 320      
Carrying Amount of Land 2,655      
Carrying Amount of Buildings and Improvements 22,230      
Accumulated Depreciation $ 8,980      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Purley, UKI, PUR Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 7,365      
Initial Cost of Buildings & Improvements 35,161      
Cost Capitalized Subsequent to Acquisition 4,583      
Carrying Amount of Land 8,077      
Carrying Amount of Buildings and Improvements 39,033      
Accumulated Depreciation $ 8,201      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2005      
Seniors Housing Operating [Member] | Queensbury, NY, QSB Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,260      
Initial Cost of Buildings & Improvements 21,744      
Cost Capitalized Subsequent to Acquisition 964      
Carrying Amount of Land 1,260      
Carrying Amount of Buildings and Improvements 22,708      
Accumulated Depreciation $ 2,401      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Quincy, MA, QCY3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,350      
Initial Cost of Buildings & Improvements 12,584      
Cost Capitalized Subsequent to Acquisition 831      
Carrying Amount of Land 1,428      
Carrying Amount of Buildings and Improvements 13,337      
Accumulated Depreciation $ 3,635      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Rancho Cucamonga, CA, RCG Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,480      
Initial Cost of Buildings & Improvements 10,055      
Cost Capitalized Subsequent to Acquisition 1,141      
Carrying Amount of Land 1,567      
Carrying Amount of Buildings and Improvements 11,109      
Accumulated Depreciation $ 2,568      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2001      
Seniors Housing Operating [Member] | Rancho Palos Verdes, CA, RPV Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 5,450      
Initial Cost of Buildings & Improvements 60,034      
Cost Capitalized Subsequent to Acquisition 2,023      
Carrying Amount of Land 5,450      
Carrying Amount of Buildings and Improvements 62,057      
Accumulated Depreciation $ 12,432      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2004      
Seniors Housing Operating [Member] | Randolph, NJ, RDP Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,540      
Initial Cost of Buildings & Improvements 46,934      
Cost Capitalized Subsequent to Acquisition 799      
Carrying Amount of Land 1,570      
Carrying Amount of Buildings and Improvements 47,703      
Accumulated Depreciation $ 8,586      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2006      
Seniors Housing Operating [Member] | Red Deer, AB, RDR Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 13,102      
Initial Cost of Land 1,247      
Initial Cost of Buildings & Improvements 19,283      
Cost Capitalized Subsequent to Acquisition 2,324      
Carrying Amount of Land 1,379      
Carrying Amount of Buildings and Improvements 21,476      
Accumulated Depreciation $ 2,820      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2004      
Seniors Housing Operating [Member] | Red Deer, AB, RDR2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 15,419      
Initial Cost of Land 1,199      
Initial Cost of Buildings & Improvements 22,339      
Cost Capitalized Subsequent to Acquisition 2,756      
Carrying Amount of Land 1,328      
Carrying Amount of Buildings and Improvements 24,966      
Accumulated Depreciation $ 3,330      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2004      
Seniors Housing Operating [Member] | Redondo Beach, CA, RED Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 0      
Initial Cost of Buildings & Improvements 9,557      
Cost Capitalized Subsequent to Acquisition 878      
Carrying Amount of Land 0      
Carrying Amount of Buildings and Improvements 10,435      
Accumulated Depreciation $ 5,609      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1957      
Seniors Housing Operating [Member] | Regina, SK, RGN Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 7,115      
Initial Cost of Land 1,485      
Initial Cost of Buildings & Improvements 21,148      
Cost Capitalized Subsequent to Acquisition 2,618      
Carrying Amount of Land 1,662      
Carrying Amount of Buildings and Improvements 23,590      
Accumulated Depreciation $ 5,180      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Regina, SK, RGN2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 6,980      
Initial Cost of Land 1,244      
Initial Cost of Buildings & Improvements 21,036      
Cost Capitalized Subsequent to Acquisition 2,720      
Carrying Amount of Land 1,380      
Carrying Amount of Buildings and Improvements 23,620      
Accumulated Depreciation $ 4,380      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2004      
Seniors Housing Operating [Member] | Regina, SK, RGN3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 16,884      
Initial Cost of Land 1,539      
Initial Cost of Buildings & Improvements 24,053      
Cost Capitalized Subsequent to Acquisition 4,834      
Carrying Amount of Land 1,704      
Carrying Amount of Buildings and Improvements 28,722      
Accumulated Depreciation $ 3,385      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1992      
Seniors Housing Operating [Member] | Renton, WA, RNT Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 20,790      
Initial Cost of Land 3,080      
Initial Cost of Buildings & Improvements 51,824      
Cost Capitalized Subsequent to Acquisition 1,123      
Carrying Amount of Land 3,119      
Carrying Amount of Buildings and Improvements 52,908      
Accumulated Depreciation $ 10,446      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 2007      
Seniors Housing Operating [Member] | Ridgefield, CT, RDF Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,100      
Initial Cost of Buildings & Improvements 80,614      
Cost Capitalized Subsequent to Acquisition 4,737      
Carrying Amount of Land 3,150      
Carrying Amount of Buildings and Improvements 85,302      
Accumulated Depreciation $ 11,313      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Riviere-du-Loup, QC, RDL Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 3,326      
Initial Cost of Land 592      
Initial Cost of Buildings & Improvements 7,601      
Cost Capitalized Subsequent to Acquisition 938      
Carrying Amount of Land 642      
Carrying Amount of Buildings and Improvements 8,489      
Accumulated Depreciation $ 895      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1956      
Seniors Housing Operating [Member] | Riviere-du-Loup, QC, RDL2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 9,515      
Initial Cost of Land 1,454      
Initial Cost of Buildings & Improvements 16,848      
Cost Capitalized Subsequent to Acquisition 4,901      
Carrying Amount of Land 1,700      
Carrying Amount of Buildings and Improvements 21,503      
Accumulated Depreciation $ 2,890      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1993      
Seniors Housing Operating [Member] | Rocky Hill, CT, RKH3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 810      
Initial Cost of Buildings & Improvements 16,351      
Cost Capitalized Subsequent to Acquisition 744      
Carrying Amount of Land 909      
Carrying Amount of Buildings and Improvements 16,995      
Accumulated Depreciation $ 4,150      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 2000      
Seniors Housing Operating [Member] | Romeoville, IL, RMV Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 854      
Initial Cost of Buildings & Improvements 12,646      
Cost Capitalized Subsequent to Acquisition 60,571      
Carrying Amount of Land 6,174      
Carrying Amount of Buildings and Improvements 67,897      
Accumulated Depreciation $ 14,427      
Year Acquired Jan. 01, 2006      
Year Built Jan. 01, 2010      
Seniors Housing Operating [Member] | Roseville, MN, RSV Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,540      
Initial Cost of Buildings & Improvements 35,877      
Cost Capitalized Subsequent to Acquisition 932      
Carrying Amount of Land 1,607      
Carrying Amount of Buildings and Improvements 36,741      
Accumulated Depreciation $ 6,269      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2002      
Seniors Housing Operating [Member] | Roseville, CA, RVL Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,300      
Initial Cost of Buildings & Improvements 41,652      
Cost Capitalized Subsequent to Acquisition 3,235      
Carrying Amount of Land 3,300      
Carrying Amount of Buildings and Improvements 44,886      
Accumulated Depreciation $ 3,868      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 2000      
Seniors Housing Operating [Member] | Roswell, GA, RWL3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,080      
Initial Cost of Buildings & Improvements 6,486      
Cost Capitalized Subsequent to Acquisition 1,558      
Carrying Amount of Land 2,385      
Carrying Amount of Buildings and Improvements 7,739      
Accumulated Depreciation $ 1,891      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 1997      
Seniors Housing Operating [Member] | Sacramento, CA, SAC3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,300      
Initial Cost of Buildings & Improvements 23,394      
Cost Capitalized Subsequent to Acquisition 1,226      
Carrying Amount of Land 1,334      
Carrying Amount of Buildings and Improvements 24,587      
Accumulated Depreciation $ 4,343      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2004      
Seniors Housing Operating [Member] | Saint-Lambert, QC, SLA Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 37,529      
Initial Cost of Land 10,259      
Initial Cost of Buildings & Improvements 61,903      
Cost Capitalized Subsequent to Acquisition 5,961      
Carrying Amount of Land 11,414      
Carrying Amount of Buildings and Improvements 66,709      
Accumulated Depreciation $ 10,015      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1989      
Seniors Housing Operating [Member] | Salem, NH, SAE Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 980      
Initial Cost of Buildings & Improvements 32,721      
Cost Capitalized Subsequent to Acquisition 4,181      
Carrying Amount of Land 1,054      
Carrying Amount of Buildings and Improvements 36,828      
Accumulated Depreciation $ 7,726      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 2000      
Seniors Housing Operating [Member] | Salinas, CA, SLS Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 5,110      
Initial Cost of Buildings & Improvements 41,424      
Cost Capitalized Subsequent to Acquisition 5,493      
Carrying Amount of Land 5,110      
Carrying Amount of Buildings and Improvements 46,916      
Accumulated Depreciation $ 4,462      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 1990      
Seniors Housing Operating [Member] | Salisbury, UKK, SSB Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,720      
Initial Cost of Buildings & Improvements 15,269      
Cost Capitalized Subsequent to Acquisition 1,820      
Carrying Amount of Land 2,983      
Carrying Amount of Buildings and Improvements 16,826      
Accumulated Depreciation $ 1,636      
Year Acquired Jan. 01, 2014      
Year Built Jan. 01, 2013      
Seniors Housing Operating [Member] | Salt Lake City, UT, SLC Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,360      
Initial Cost of Buildings & Improvements 19,691      
Cost Capitalized Subsequent to Acquisition 1,949      
Carrying Amount of Land 1,360      
Carrying Amount of Buildings and Improvements 21,640      
Accumulated Depreciation $ 6,685      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1986      
Seniors Housing Operating [Member] | San Antonio, TX, SNN11 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 6,120      
Initial Cost of Buildings & Improvements 28,169      
Cost Capitalized Subsequent to Acquisition 2,482      
Carrying Amount of Land 6,120      
Carrying Amount of Buildings and Improvements 30,651      
Accumulated Depreciation $ 5,207      
Year Acquired Jan. 01, 2010      
Year Built Jan. 01, 2011      
Seniors Housing Operating [Member] | San Antonio, TX, SNN12 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 5,045      
Initial Cost of Buildings & Improvements 58,048      
Cost Capitalized Subsequent to Acquisition 3,129      
Carrying Amount of Land 5,045      
Carrying Amount of Buildings and Improvements 61,177      
Accumulated Depreciation $ 656      
Year Acquired Jan. 01, 2017      
Year Built Jan. 01, 2015      
Seniors Housing Operating [Member] | San Diego, CA, SDG2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 4,200      
Initial Cost of Buildings & Improvements 30,707      
Cost Capitalized Subsequent to Acquisition 513      
Carrying Amount of Land 4,243      
Carrying Amount of Buildings and Improvements 31,177      
Accumulated Depreciation $ 4,952      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 2011      
Seniors Housing Operating [Member] | San Diego, CA, SDG3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 5,810      
Initial Cost of Buildings & Improvements 63,078      
Cost Capitalized Subsequent to Acquisition 2,329      
Carrying Amount of Land 5,810      
Carrying Amount of Buildings and Improvements 65,407      
Accumulated Depreciation $ 15,249      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2001      
Seniors Housing Operating [Member] | San Diego, CA, SDG4 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,000      
Initial Cost of Buildings & Improvements 27,164      
Cost Capitalized Subsequent to Acquisition 763      
Carrying Amount of Land 3,000      
Carrying Amount of Buildings and Improvements 27,927      
Accumulated Depreciation $ 4,709      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2003      
Seniors Housing Operating [Member] | San Francisco, CA, SFC Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 5,920      
Initial Cost of Buildings & Improvements 91,639      
Cost Capitalized Subsequent to Acquisition 11,529      
Carrying Amount of Land 5,920      
Carrying Amount of Buildings and Improvements 103,168      
Accumulated Depreciation $ 7,666      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | San Francisco, CA, SFC2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 11,800      
Initial Cost of Buildings & Improvements 77,214      
Cost Capitalized Subsequent to Acquisition 9,132      
Carrying Amount of Land 11,800      
Carrying Amount of Buildings and Improvements 86,346      
Accumulated Depreciation $ 6,679      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 1923      
Seniors Housing Operating [Member] | San Gabriel, CA, SGB Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,120      
Initial Cost of Buildings & Improvements 15,566      
Cost Capitalized Subsequent to Acquisition 860      
Carrying Amount of Land 3,138      
Carrying Amount of Buildings and Improvements 16,407      
Accumulated Depreciation $ 3,283      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2005      
Seniors Housing Operating [Member] | San Jose, CA, SNJ Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,850      
Initial Cost of Buildings & Improvements 35,098      
Cost Capitalized Subsequent to Acquisition 600      
Carrying Amount of Land 2,858      
Carrying Amount of Buildings and Improvements 35,690      
Accumulated Depreciation $ 7,052      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | San Jose, CA, SNJ2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,280      
Initial Cost of Buildings & Improvements 46,823      
Cost Capitalized Subsequent to Acquisition 2,355      
Carrying Amount of Land 3,280      
Carrying Amount of Buildings and Improvements 49,178      
Accumulated Depreciation $ 9,756      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2002      
Seniors Housing Operating [Member] | San Jose, CA, SNJ3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 11,900      
Initial Cost of Buildings & Improvements 27,647      
Cost Capitalized Subsequent to Acquisition 3,271      
Carrying Amount of Land 11,900      
Carrying Amount of Buildings and Improvements 30,918      
Accumulated Depreciation $ 3,497      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 2002      
Seniors Housing Operating [Member] | San Juan Capistrano, CA, SJC Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,390      
Initial Cost of Buildings & Improvements 6,942      
Cost Capitalized Subsequent to Acquisition 1,491      
Carrying Amount of Land 1,390      
Carrying Amount of Buildings and Improvements 8,433      
Accumulated Depreciation $ 3,634      
Year Acquired Jan. 01, 2000      
Year Built Jan. 01, 2001      
Seniors Housing Operating [Member] | San Rafael, CA, SRF Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,620      
Initial Cost of Buildings & Improvements 27,392      
Cost Capitalized Subsequent to Acquisition 1,960      
Carrying Amount of Land 1,635      
Carrying Amount of Buildings and Improvements 29,337      
Accumulated Depreciation $ 2,597      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 2001      
Seniors Housing Operating [Member] | San Ramon, CA, SAR2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 8,700      
Initial Cost of Buildings & Improvements 72,223      
Cost Capitalized Subsequent to Acquisition 6,745      
Carrying Amount of Land 8,700      
Carrying Amount of Buildings and Improvements 78,968      
Accumulated Depreciation $ 6,181      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 1992      
Seniors Housing Operating [Member] | Sandy Springs, GA, SDS Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,214      
Initial Cost of Buildings & Improvements 8,360      
Cost Capitalized Subsequent to Acquisition 676      
Carrying Amount of Land 2,220      
Carrying Amount of Buildings and Improvements 9,030      
Accumulated Depreciation $ 2,404      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 1997      
Seniors Housing Operating [Member] | Santa Maria, CA, STM Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 6,050      
Initial Cost of Buildings & Improvements 50,658      
Cost Capitalized Subsequent to Acquisition 2,966      
Carrying Amount of Land 6,089      
Carrying Amount of Buildings and Improvements 53,585      
Accumulated Depreciation $ 13,408      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 2001      
Seniors Housing Operating [Member] | Santa Monica, CA, SMC Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 19,149      
Initial Cost of Land 5,250      
Initial Cost of Buildings & Improvements 28,340      
Cost Capitalized Subsequent to Acquisition 869      
Carrying Amount of Land 5,263      
Carrying Amount of Buildings and Improvements 29,196      
Accumulated Depreciation $ 5,352      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2004      
Seniors Housing Operating [Member] | Santa Rosa, CA, SNR2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,250      
Initial Cost of Buildings & Improvements 26,273      
Cost Capitalized Subsequent to Acquisition 2,094      
Carrying Amount of Land 2,250      
Carrying Amount of Buildings and Improvements 28,367      
Accumulated Depreciation $ 2,623      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 2001      
Seniors Housing Operating [Member] | Saskatoon, SK, SSK Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 4,390      
Initial Cost of Land 981      
Initial Cost of Buildings & Improvements 13,905      
Cost Capitalized Subsequent to Acquisition 1,778      
Carrying Amount of Land 1,084      
Carrying Amount of Buildings and Improvements 15,580      
Accumulated Depreciation $ 2,760      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Saskatoon, SK, SSK2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 14,740      
Initial Cost of Land 1,382      
Initial Cost of Buildings & Improvements 17,609      
Cost Capitalized Subsequent to Acquisition 2,272      
Carrying Amount of Land 1,528      
Carrying Amount of Buildings and Improvements 19,735      
Accumulated Depreciation $ 3,435      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2004      
Seniors Housing Operating [Member] | Schaumburg, IL, SHG Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,460      
Initial Cost of Buildings & Improvements 22,863      
Cost Capitalized Subsequent to Acquisition 1,060      
Carrying Amount of Land 2,486      
Carrying Amount of Buildings and Improvements 23,896      
Accumulated Depreciation $ 5,198      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2001      
Seniors Housing Operating [Member] | Scottsdale, AZ, SCT2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,500      
Initial Cost of Buildings & Improvements 3,890      
Cost Capitalized Subsequent to Acquisition 1,704      
Carrying Amount of Land 2,500      
Carrying Amount of Buildings and Improvements 5,594      
Accumulated Depreciation $ 1,583      
Year Acquired Jan. 01, 2008      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Seal Beach, CA, SBC Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 6,204      
Initial Cost of Buildings & Improvements 72,954      
Cost Capitalized Subsequent to Acquisition 1,757      
Carrying Amount of Land 6,271      
Carrying Amount of Buildings and Improvements 74,644      
Accumulated Depreciation $ 17,334      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2004      
Seniors Housing Operating [Member] | Seattle, WA, SEA6 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 48,540      
Initial Cost of Land 6,790      
Initial Cost of Buildings & Improvements 85,369      
Cost Capitalized Subsequent to Acquisition 2,520      
Carrying Amount of Land 6,825      
Carrying Amount of Buildings and Improvements 87,854      
Accumulated Depreciation $ 17,947      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Seattle, WA, SEA7 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,150      
Initial Cost of Buildings & Improvements 19,887      
Cost Capitalized Subsequent to Acquisition 1,032      
Carrying Amount of Land 1,150      
Carrying Amount of Buildings and Improvements 20,919      
Accumulated Depreciation $ 2,119      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1995      
Seniors Housing Operating [Member] | Sevenoaks, UKJ, SVK Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 6,181      
Initial Cost of Buildings & Improvements 40,240      
Cost Capitalized Subsequent to Acquisition 5,956      
Carrying Amount of Land 6,778      
Carrying Amount of Buildings and Improvements 45,599      
Accumulated Depreciation $ 9,281      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Severna Park, MD, SEV2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 0      
Initial Cost of Buildings & Improvements 67,623      
Cost Capitalized Subsequent to Acquisition 5,264      
Carrying Amount of Land 6      
Carrying Amount of Buildings and Improvements 72,882      
Accumulated Depreciation $ 7,069      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 1997      
Seniors Housing Operating [Member] | Shelburne, VT, SHU Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 720      
Initial Cost of Buildings & Improvements 31,041      
Cost Capitalized Subsequent to Acquisition 1,921      
Carrying Amount of Land 777      
Carrying Amount of Buildings and Improvements 32,904      
Accumulated Depreciation $ 7,180      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1988      
Seniors Housing Operating [Member] | Shelby Township, MI, STS Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 15,894      
Initial Cost of Land 1,040      
Initial Cost of Buildings & Improvements 26,344      
Cost Capitalized Subsequent to Acquisition 1,170      
Carrying Amount of Land 1,100      
Carrying Amount of Buildings and Improvements 27,453      
Accumulated Depreciation $ 4,716      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2006      
Seniors Housing Operating [Member] | Shelton, CT, SLT Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,246      
Initial Cost of Buildings & Improvements 33,967      
Cost Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 2,246      
Carrying Amount of Buildings and Improvements 33,967      
Accumulated Depreciation $ 1,839      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2014      
Seniors Housing Operating [Member] | Shrewsbury, MA, SRW Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 950      
Initial Cost of Buildings & Improvements 26,824      
Cost Capitalized Subsequent to Acquisition 1,315      
Carrying Amount of Land 950      
Carrying Amount of Buildings and Improvements 28,139      
Accumulated Depreciation $ 3,286      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1997      
Seniors Housing Operating [Member] | Sidcup, UKI, SID Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 7,446      
Initial Cost of Buildings & Improvements 56,570      
Cost Capitalized Subsequent to Acquisition 6,802      
Carrying Amount of Land 8,183      
Carrying Amount of Buildings and Improvements 62,636      
Accumulated Depreciation $ 14,212      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2000      
Seniors Housing Operating [Member] | Simi Valley, CA, SVY Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,200      
Initial Cost of Buildings & Improvements 16,664      
Cost Capitalized Subsequent to Acquisition 898      
Carrying Amount of Land 3,238      
Carrying Amount of Buildings and Improvements 17,524      
Accumulated Depreciation $ 4,377      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Simi Valley, CA, SVY2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 5,510      
Initial Cost of Buildings & Improvements 51,406      
Cost Capitalized Subsequent to Acquisition 6,469      
Carrying Amount of Land 5,510      
Carrying Amount of Buildings and Improvements 57,875      
Accumulated Depreciation $ 4,891      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 2003      
Seniors Housing Operating [Member] | Solihull, UKG, KNL Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 5,070      
Initial Cost of Buildings & Improvements 43,297      
Cost Capitalized Subsequent to Acquisition 5,457      
Carrying Amount of Land 5,560      
Carrying Amount of Buildings and Improvements 48,264      
Accumulated Depreciation $ 9,412      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Solihull, UKG, SOL Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,571      
Initial Cost of Buildings & Improvements 26,053      
Cost Capitalized Subsequent to Acquisition 3,191      
Carrying Amount of Land 3,917      
Carrying Amount of Buildings and Improvements 28,899      
Accumulated Depreciation $ 5,786      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2007      
Seniors Housing Operating [Member] | Solihull, UKG, SOL2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,851      
Initial Cost of Buildings & Improvements 10,585      
Cost Capitalized Subsequent to Acquisition 1,263      
Carrying Amount of Land 2,029      
Carrying Amount of Buildings and Improvements 11,670      
Accumulated Depreciation $ 494      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2016      
Seniors Housing Operating [Member] | Sonning, UKJ, SNG Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 5,644      
Initial Cost of Buildings & Improvements 42,155      
Cost Capitalized Subsequent to Acquisition 5,197      
Carrying Amount of Land 6,189      
Carrying Amount of Buildings and Improvements 46,807      
Accumulated Depreciation $ 8,529      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2009      
Seniors Housing Operating [Member] | Sonoma, CA, SON2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,820      
Initial Cost of Buildings & Improvements 21,890      
Cost Capitalized Subsequent to Acquisition 1,879      
Carrying Amount of Land 2,820      
Carrying Amount of Buildings and Improvements 23,769      
Accumulated Depreciation $ 2,202      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 2005      
Seniors Housing Operating [Member] | South Windsor, CT, SWD2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,000      
Initial Cost of Buildings & Improvements 29,295      
Cost Capitalized Subsequent to Acquisition 2,870      
Carrying Amount of Land 3,104      
Carrying Amount of Buildings and Improvements 32,061      
Accumulated Depreciation $ 8,587      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Spokane, WA, SKN Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,200      
Initial Cost of Buildings & Improvements 25,064      
Cost Capitalized Subsequent to Acquisition 619      
Carrying Amount of Land 3,271      
Carrying Amount of Buildings and Improvements 25,612      
Accumulated Depreciation $ 6,718      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2001      
Seniors Housing Operating [Member] | Spokane, WA, SKN2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,580      
Initial Cost of Buildings & Improvements 25,342      
Cost Capitalized Subsequent to Acquisition 399      
Carrying Amount of Land 2,639      
Carrying Amount of Buildings and Improvements 25,682      
Accumulated Depreciation $ 5,571      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | St. Albert, AB, SAT Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 8,701      
Initial Cost of Land 1,145      
Initial Cost of Buildings & Improvements 17,863      
Cost Capitalized Subsequent to Acquisition 3,003      
Carrying Amount of Land 1,266      
Carrying Amount of Buildings and Improvements 20,745      
Accumulated Depreciation $ 5,136      
Year Acquired Jan. 01, 2014      
Year Built Jan. 01, 2005      
Seniors Housing Operating [Member] | St. John's, NL, SJN Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 6,222      
Initial Cost of Land 706      
Initial Cost of Buildings & Improvements 11,765      
Cost Capitalized Subsequent to Acquisition 1,081      
Carrying Amount of Land 757      
Carrying Amount of Buildings and Improvements 12,795      
Accumulated Depreciation $ 1,308      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2005      
Seniors Housing Operating [Member] | Stittsville, ON, SSL Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 4,848      
Initial Cost of Land 1,175      
Initial Cost of Buildings & Improvements 17,397      
Cost Capitalized Subsequent to Acquisition 2,286      
Carrying Amount of Land 1,299      
Carrying Amount of Buildings and Improvements 19,559      
Accumulated Depreciation $ 3,456      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1996      
Seniors Housing Operating [Member] | Stockport, UKD, SKP Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 4,369      
Initial Cost of Buildings & Improvements 25,018      
Cost Capitalized Subsequent to Acquisition 3,041      
Carrying Amount of Land 4,791      
Carrying Amount of Buildings and Improvements 27,637      
Accumulated Depreciation $ 6,015      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2008      
Seniors Housing Operating [Member] | Studio City, CA, SDC Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 4,006      
Initial Cost of Buildings & Improvements 25,307      
Cost Capitalized Subsequent to Acquisition 988      
Carrying Amount of Land 4,071      
Carrying Amount of Buildings and Improvements 26,230      
Accumulated Depreciation $ 5,707      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2004      
Seniors Housing Operating [Member] | Sugar Land, TX, SUG Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 960      
Initial Cost of Buildings & Improvements 31,423      
Cost Capitalized Subsequent to Acquisition 1,723      
Carrying Amount of Land 960      
Carrying Amount of Buildings and Improvements 33,146      
Accumulated Depreciation $ 8,437      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1996      
Seniors Housing Operating [Member] | Sugar Land, TX, SUG2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 4,272      
Initial Cost of Buildings & Improvements 60,493      
Cost Capitalized Subsequent to Acquisition 6,497      
Carrying Amount of Land 4,272      
Carrying Amount of Buildings and Improvements 66,989      
Accumulated Depreciation $ 970      
Year Acquired Jan. 01, 2017      
Year Built Jan. 01, 2015      
Seniors Housing Operating [Member] | Sun City, FL, SUR Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 21,294      
Initial Cost of Land 6,521      
Initial Cost of Buildings & Improvements 48,476      
Cost Capitalized Subsequent to Acquisition 3,655      
Carrying Amount of Land 6,622      
Carrying Amount of Buildings and Improvements 52,030      
Accumulated Depreciation $ 8,661      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1995      
Seniors Housing Operating [Member] | Sun City, FL, SUR2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 23,992      
Initial Cost of Land 5,040      
Initial Cost of Buildings & Improvements 50,923      
Cost Capitalized Subsequent to Acquisition 3,365      
Carrying Amount of Land 5,338      
Carrying Amount of Buildings and Improvements 53,990      
Accumulated Depreciation $ 8,143      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Sun City West, AZ, SCW Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 11,780      
Initial Cost of Land 1,250      
Initial Cost of Buildings & Improvements 21,778      
Cost Capitalized Subsequent to Acquisition 1,123      
Carrying Amount of Land 1,274      
Carrying Amount of Buildings and Improvements 22,877      
Accumulated Depreciation $ 4,311      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Sunnyvale, CA, SNY Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 5,420      
Initial Cost of Buildings & Improvements 41,682      
Cost Capitalized Subsequent to Acquisition 1,995      
Carrying Amount of Land 5,420      
Carrying Amount of Buildings and Improvements 43,677      
Accumulated Depreciation $ 8,985      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2002      
Seniors Housing Operating [Member] | Surrey, BC, SRY2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 7,228      
Initial Cost of Land 3,605      
Initial Cost of Buildings & Improvements 18,818      
Cost Capitalized Subsequent to Acquisition 2,900      
Carrying Amount of Land 3,985      
Carrying Amount of Buildings and Improvements 21,338      
Accumulated Depreciation $ 5,675      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2000      
Seniors Housing Operating [Member] | Surrey, BC, SRY3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 17,047      
Initial Cost of Land 4,552      
Initial Cost of Buildings & Improvements 22,338      
Cost Capitalized Subsequent to Acquisition 3,780      
Carrying Amount of Land 5,045      
Carrying Amount of Buildings and Improvements 25,625      
Accumulated Depreciation $ 7,201      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1987      
Seniors Housing Operating [Member] | Sutton, UKI, SUO Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 4,096      
Initial Cost of Buildings & Improvements 14,532      
Cost Capitalized Subsequent to Acquisition 1,872      
Carrying Amount of Land 4,492      
Carrying Amount of Buildings and Improvements 16,009      
Accumulated Depreciation $ 464      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2016      
Seniors Housing Operating [Member] | Suwanee, GA, SWE4 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,560      
Initial Cost of Buildings & Improvements 11,538      
Cost Capitalized Subsequent to Acquisition 842      
Carrying Amount of Land 1,560      
Carrying Amount of Buildings and Improvements 12,380      
Accumulated Depreciation $ 2,876      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2000      
Seniors Housing Operating [Member] | Sway, UKJ, SWY Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 4,145      
Initial Cost of Buildings & Improvements 15,508      
Cost Capitalized Subsequent to Acquisition 2,094      
Carrying Amount of Land 4,596      
Carrying Amount of Buildings and Improvements 17,151      
Accumulated Depreciation $ 2,722      
Year Acquired Jan. 01, 2014      
Year Built Jan. 01, 2008      
Seniors Housing Operating [Member] | Swift Current, SK, SCR Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 2,228      
Initial Cost of Land 492      
Initial Cost of Buildings & Improvements 10,119      
Cost Capitalized Subsequent to Acquisition 1,315      
Carrying Amount of Land 550      
Carrying Amount of Buildings and Improvements 11,376      
Accumulated Depreciation $ 2,236      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2001      
Seniors Housing Operating [Member] | Tacoma, WA, TCM Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 17,760      
Initial Cost of Land 2,400      
Initial Cost of Buildings & Improvements 35,053      
Cost Capitalized Subsequent to Acquisition 584      
Carrying Amount of Land 2,459      
Carrying Amount of Buildings and Improvements 35,579      
Accumulated Depreciation $ 7,107      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 2008      
Seniors Housing Operating [Member] | Tacoma, WA, TCM2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,535      
Initial Cost of Buildings & Improvements 6,068      
Cost Capitalized Subsequent to Acquisition 59      
Carrying Amount of Land 1,537      
Carrying Amount of Buildings and Improvements 6,125      
Accumulated Depreciation $ 935      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2012      
Seniors Housing Operating [Member] | Tacoma, WA, TCM4 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 4,170      
Initial Cost of Buildings & Improvements 73,377      
Cost Capitalized Subsequent to Acquisition 8,824      
Carrying Amount of Land 4,170      
Carrying Amount of Buildings and Improvements 82,201      
Accumulated Depreciation $ 6,113      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 1987      
Seniors Housing Operating [Member] | Tampa, FL, TMP4 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 69,330      
Initial Cost of Land 4,910      
Initial Cost of Buildings & Improvements 114,148      
Cost Capitalized Subsequent to Acquisition 3,636      
Carrying Amount of Land 4,962      
Carrying Amount of Buildings and Improvements 117,732      
Accumulated Depreciation $ 15,060      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2001      
Seniors Housing Operating [Member] | Tewksbury, MA, TKB2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,350      
Initial Cost of Buildings & Improvements 24,118      
Cost Capitalized Subsequent to Acquisition 1,985      
Carrying Amount of Land 2,350      
Carrying Amount of Buildings and Improvements 26,104      
Accumulated Depreciation $ 1,826      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 2006      
Seniors Housing Operating [Member] | The Woodlands, TX, WDL Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 480      
Initial Cost of Buildings & Improvements 12,379      
Cost Capitalized Subsequent to Acquisition 824      
Carrying Amount of Land 480      
Carrying Amount of Buildings and Improvements 13,203      
Accumulated Depreciation $ 3,065      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Toledo, OH, TOL2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,040      
Initial Cost of Buildings & Improvements 47,129      
Cost Capitalized Subsequent to Acquisition 3,358      
Carrying Amount of Land 2,144      
Carrying Amount of Buildings and Improvements 50,383      
Accumulated Depreciation $ 13,525      
Year Acquired Jan. 01, 2010      
Year Built Jan. 01, 1985      
Seniors Housing Operating [Member] | Toronto, ON, TRT10 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 18,615      
Initial Cost of Land 2,927      
Initial Cost of Buildings & Improvements 20,713      
Cost Capitalized Subsequent to Acquisition 3,327      
Carrying Amount of Land 3,266      
Carrying Amount of Buildings and Improvements 23,701      
Accumulated Depreciation $ 2,802      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1900      
Seniors Housing Operating [Member] | Toronto, ON, TRT11 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 9,662      
Initial Cost of Land 5,082      
Initial Cost of Buildings & Improvements 25,493      
Cost Capitalized Subsequent to Acquisition 3,817      
Carrying Amount of Land 5,624      
Carrying Amount of Buildings and Improvements 28,767      
Accumulated Depreciation $ 5,008      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1988      
Seniors Housing Operating [Member] | Toronto, ON, TRT12 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 13,959      
Initial Cost of Land 2,040      
Initial Cost of Buildings & Improvements 19,822      
Cost Capitalized Subsequent to Acquisition 1,608      
Carrying Amount of Land 2,188      
Carrying Amount of Buildings and Improvements 21,282      
Accumulated Depreciation $ 2,737      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Toronto, ON, TRT13 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 40,768      
Initial Cost of Land 5,132      
Initial Cost of Buildings & Improvements 41,657      
Cost Capitalized Subsequent to Acquisition 7,208      
Carrying Amount of Land 5,674      
Carrying Amount of Buildings and Improvements 48,322      
Accumulated Depreciation $ 9,699      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1964      
Seniors Housing Operating [Member] | Toronto, ON, TRT14 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 4,650      
Initial Cost of Land 2,480      
Initial Cost of Buildings & Improvements 7,571      
Cost Capitalized Subsequent to Acquisition 1,343      
Carrying Amount of Land 2,742      
Carrying Amount of Buildings and Improvements 8,652      
Accumulated Depreciation $ 1,638      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1971      
Seniors Housing Operating [Member] | Toronto, ON, TRT4 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 1,439      
Initial Cost of Land 1,079      
Initial Cost of Buildings & Improvements 5,364      
Cost Capitalized Subsequent to Acquisition 844      
Carrying Amount of Land 1,193      
Carrying Amount of Buildings and Improvements 6,094      
Accumulated Depreciation $ 1,170      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1982      
Seniors Housing Operating [Member] | Toronto, ON, TRT5 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 8,587      
Initial Cost of Land 2,513      
Initial Cost of Buildings & Improvements 19,695      
Cost Capitalized Subsequent to Acquisition 2,814      
Carrying Amount of Land 2,815      
Carrying Amount of Buildings and Improvements 22,208      
Accumulated Depreciation $ 3,535      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2002      
Seniors Housing Operating [Member] | Toronto, ON, TRT6 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 19,525      
Initial Cost of Land 3,400      
Initial Cost of Buildings & Improvements 32,757      
Cost Capitalized Subsequent to Acquisition 4,524      
Carrying Amount of Land 3,764      
Carrying Amount of Buildings and Improvements 36,917      
Accumulated Depreciation $ 7,504      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1973      
Seniors Housing Operating [Member] | Toronto, ON, TRT7 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 962      
Initial Cost of Land 1,361      
Initial Cost of Buildings & Improvements 2,915      
Cost Capitalized Subsequent to Acquisition 667      
Carrying Amount of Land 1,528      
Carrying Amount of Buildings and Improvements 3,415      
Accumulated Depreciation $ 1,139      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1985      
Seniors Housing Operating [Member] | Toronto, ON, TRT8 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 6,355      
Initial Cost of Land 1,447      
Initial Cost of Buildings & Improvements 3,918      
Cost Capitalized Subsequent to Acquisition 725      
Carrying Amount of Land 1,600      
Carrying Amount of Buildings and Improvements 4,490      
Accumulated Depreciation $ 1,107      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1987      
Seniors Housing Operating [Member] | Toronto, ON, TRT9 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 34,411      
Initial Cost of Land 5,304      
Initial Cost of Buildings & Improvements 53,488      
Cost Capitalized Subsequent to Acquisition 7,151      
Carrying Amount of Land 5,869      
Carrying Amount of Buildings and Improvements 60,074      
Accumulated Depreciation $ 15,630      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1988      
Seniors Housing Operating [Member] | Torrance, CA, TOR3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,497      
Initial Cost of Buildings & Improvements 73,138      
Cost Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 3,497      
Carrying Amount of Buildings and Improvements 73,138      
Accumulated Depreciation $ 972      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 2016      
Seniors Housing Operating [Member] | Trumbull, CT, TRU Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,850      
Initial Cost of Buildings & Improvements 37,685      
Cost Capitalized Subsequent to Acquisition 2,058      
Carrying Amount of Land 2,935      
Carrying Amount of Buildings and Improvements 39,657      
Accumulated Depreciation $ 10,412      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Tucson, AZ, TCS5 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 4,436      
Initial Cost of Land 830      
Initial Cost of Buildings & Improvements 6,179      
Cost Capitalized Subsequent to Acquisition 3,732      
Carrying Amount of Land 913      
Carrying Amount of Buildings and Improvements 9,827      
Accumulated Depreciation $ 1,801      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 1997      
Seniors Housing Operating [Member] | Tulsa, OK, TUL3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,330      
Initial Cost of Buildings & Improvements 21,285      
Cost Capitalized Subsequent to Acquisition 3,767      
Carrying Amount of Land 1,350      
Carrying Amount of Buildings and Improvements 25,032      
Accumulated Depreciation $ 6,186      
Year Acquired Jan. 01, 2010      
Year Built Jan. 01, 1986      
Seniors Housing Operating [Member] | Tulsa, OK, TUL4 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,500      
Initial Cost of Buildings & Improvements 20,861      
Cost Capitalized Subsequent to Acquisition 3,455      
Carrying Amount of Land 1,581      
Carrying Amount of Buildings and Improvements 24,235      
Accumulated Depreciation $ 6,334      
Year Acquired Jan. 01, 2010      
Year Built Jan. 01, 1984      
Seniors Housing Operating [Member] | Tustin, CA, TST Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 840      
Initial Cost of Buildings & Improvements 15,299      
Cost Capitalized Subsequent to Acquisition 716      
Carrying Amount of Land 840      
Carrying Amount of Buildings and Improvements 16,015      
Accumulated Depreciation $ 3,409      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1965      
Seniors Housing Operating [Member] | Upland, CA, UPL Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,160      
Initial Cost of Buildings & Improvements 42,596      
Cost Capitalized Subsequent to Acquisition 14      
Carrying Amount of Land 3,160      
Carrying Amount of Buildings and Improvements 42,610      
Accumulated Depreciation $ 4,098      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2014      
Seniors Housing Operating [Member] | Upper St Claire, PA, USC Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,102      
Initial Cost of Buildings & Improvements 13,455      
Cost Capitalized Subsequent to Acquisition 875      
Carrying Amount of Land 1,102      
Carrying Amount of Buildings and Improvements 14,330      
Accumulated Depreciation $ 3,267      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2005      
Seniors Housing Operating [Member] | Vancouver, BC, VCV Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 7,934      
Initial Cost of Buildings & Improvements 6,875      
Cost Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 7,934      
Carrying Amount of Buildings and Improvements 6,875      
Accumulated Depreciation $ 5,704      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1974      
Seniors Housing Operating [Member] | Vankleek Hill, ON, VKH Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 943      
Initial Cost of Land 389      
Initial Cost of Buildings & Improvements 2,960      
Cost Capitalized Subsequent to Acquisition 553      
Carrying Amount of Land 436      
Carrying Amount of Buildings and Improvements 3,466      
Accumulated Depreciation $ 784      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1987      
Seniors Housing Operating [Member] | Vaudreuil, QC, VDR Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 8,744      
Initial Cost of Land 1,852      
Initial Cost of Buildings & Improvements 14,214      
Cost Capitalized Subsequent to Acquisition 1,844      
Carrying Amount of Land 1,993      
Carrying Amount of Buildings and Improvements 15,917      
Accumulated Depreciation $ 1,932      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1975      
Seniors Housing Operating [Member] | Venice, FL, VNC4 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 64,425      
Initial Cost of Land 6,820      
Initial Cost of Buildings & Improvements 100,501      
Cost Capitalized Subsequent to Acquisition 3,093      
Carrying Amount of Land 6,872      
Carrying Amount of Buildings and Improvements 103,542      
Accumulated Depreciation $ 14,087      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2002      
Seniors Housing Operating [Member] | Vero Beach, FL, VRB4 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,930      
Initial Cost of Buildings & Improvements 40,070      
Cost Capitalized Subsequent to Acquisition 25,412      
Carrying Amount of Land 2,930      
Carrying Amount of Buildings and Improvements 65,482      
Accumulated Depreciation $ 14,513      
Year Acquired Jan. 01, 2007      
Year Built Jan. 01, 2003      
Seniors Housing Operating [Member] | Victoria, BC, VTA2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 7,752      
Initial Cost of Land 2,856      
Initial Cost of Buildings & Improvements 18,038      
Cost Capitalized Subsequent to Acquisition 2,502      
Carrying Amount of Land 3,157      
Carrying Amount of Buildings and Improvements 20,238      
Accumulated Depreciation $ 4,544      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1974      
Seniors Housing Operating [Member] | Victoria, BC, VTA3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 7,147      
Initial Cost of Land 3,681      
Initial Cost of Buildings & Improvements 15,774      
Cost Capitalized Subsequent to Acquisition 2,273      
Carrying Amount of Land 4,070      
Carrying Amount of Buildings and Improvements 17,658      
Accumulated Depreciation $ 4,125      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1988      
Seniors Housing Operating [Member] | Victoria, BC, VTA4 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 8,015      
Initial Cost of Land 2,476      
Initial Cost of Buildings & Improvements 15,379      
Cost Capitalized Subsequent to Acquisition 2,591      
Carrying Amount of Land 2,741      
Carrying Amount of Buildings and Improvements 17,705      
Accumulated Depreciation $ 1,829      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1990      
Seniors Housing Operating [Member] | Virginia Water, UKJ, VGW Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 7,106      
Initial Cost of Buildings & Improvements 29,937      
Cost Capitalized Subsequent to Acquisition 6,182      
Carrying Amount of Land 5,943      
Carrying Amount of Buildings and Improvements 37,281      
Accumulated Depreciation $ 7,286      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2002      
Seniors Housing Operating [Member] | Walnut Creek, CA, WLC Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,700      
Initial Cost of Buildings & Improvements 12,467      
Cost Capitalized Subsequent to Acquisition 1,695      
Carrying Amount of Land 3,794      
Carrying Amount of Buildings and Improvements 14,067      
Accumulated Depreciation $ 3,603      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Walnut Creek, CA, WLC2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 10,320      
Initial Cost of Buildings & Improvements 100,890      
Cost Capitalized Subsequent to Acquisition 10,385      
Carrying Amount of Land 10,320      
Carrying Amount of Buildings and Improvements 111,275      
Accumulated Depreciation $ 8,442      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 1988      
Seniors Housing Operating [Member] | Waltham, MA, WLT2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,462      
Initial Cost of Buildings & Improvements 40,062      
Cost Capitalized Subsequent to Acquisition 1,355      
Carrying Amount of Land 2,536      
Carrying Amount of Buildings and Improvements 41,344      
Accumulated Depreciation $ 5,437      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2000      
Seniors Housing Operating [Member] | Warwick, RI, WAW Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,400      
Initial Cost of Buildings & Improvements 24,635      
Cost Capitalized Subsequent to Acquisition 2,407      
Carrying Amount of Land 2,407      
Carrying Amount of Buildings and Improvements 27,036      
Accumulated Depreciation $ 7,952      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Washington, DC, WSH2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 30,841      
Initial Cost of Land 4,000      
Initial Cost of Buildings & Improvements 69,154      
Cost Capitalized Subsequent to Acquisition 2,023      
Carrying Amount of Land 4,002      
Carrying Amount of Buildings and Improvements 71,175      
Accumulated Depreciation $ 12,670      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2004      
Seniors Housing Operating [Member] | Waterbury, CT, WBY2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,460      
Initial Cost of Buildings & Improvements 39,547      
Cost Capitalized Subsequent to Acquisition 3,283      
Carrying Amount of Land 2,495      
Carrying Amount of Buildings and Improvements 42,795      
Accumulated Depreciation $ 13,963      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Wayland, MA, WAY Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,207      
Initial Cost of Buildings & Improvements 27,462      
Cost Capitalized Subsequent to Acquisition 1,389      
Carrying Amount of Land 1,334      
Carrying Amount of Buildings and Improvements 28,724      
Accumulated Depreciation $ 5,630      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1997      
Seniors Housing Operating [Member] | Webster Groves, MO, WBG Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,790      
Initial Cost of Buildings & Improvements 15,425      
Cost Capitalized Subsequent to Acquisition 2,152      
Carrying Amount of Land 1,790      
Carrying Amount of Buildings and Improvements 17,577      
Accumulated Depreciation $ 3,197      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 2012      
Seniors Housing Operating [Member] | Welland, ON, WLA Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 6,858      
Initial Cost of Land 983      
Initial Cost of Buildings & Improvements 7,530      
Cost Capitalized Subsequent to Acquisition 691      
Carrying Amount of Land 1,055      
Carrying Amount of Buildings and Improvements 8,149      
Accumulated Depreciation $ 954      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2006      
Seniors Housing Operating [Member] | Wellesley, MA, WLY Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 4,690      
Initial Cost of Buildings & Improvements 77,462      
Cost Capitalized Subsequent to Acquisition 162      
Carrying Amount of Land 4,690      
Carrying Amount of Buildings and Improvements 77,624      
Accumulated Depreciation $ 9,840      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2012      
Seniors Housing Operating [Member] | West Babylon, NY, WBB Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,960      
Initial Cost of Buildings & Improvements 47,085      
Cost Capitalized Subsequent to Acquisition 1,759      
Carrying Amount of Land 3,960      
Carrying Amount of Buildings and Improvements 48,844      
Accumulated Depreciation $ 8,199      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2003      
Seniors Housing Operating [Member] | West Bloomfield, MI, WBF Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,040      
Initial Cost of Buildings & Improvements 12,300      
Cost Capitalized Subsequent to Acquisition 726      
Carrying Amount of Land 1,089      
Carrying Amount of Buildings and Improvements 12,977      
Accumulated Depreciation $ 2,563      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2000      
Seniors Housing Operating [Member] | West Hills, CA, WHL Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,600      
Initial Cost of Buildings & Improvements 7,521      
Cost Capitalized Subsequent to Acquisition 857      
Carrying Amount of Land 2,636      
Carrying Amount of Buildings and Improvements 8,342      
Accumulated Depreciation $ 2,363      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2002      
Seniors Housing Operating [Member] | West Vancouver, BC, WVR Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 19,905      
Initial Cost of Land 7,059      
Initial Cost of Buildings & Improvements 28,155      
Cost Capitalized Subsequent to Acquisition 4,847      
Carrying Amount of Land 7,805      
Carrying Amount of Buildings and Improvements 32,256      
Accumulated Depreciation $ 6,834      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1987      
Seniors Housing Operating [Member] | Westbourne, UKK, WTB Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 5,441      
Initial Cost of Buildings & Improvements 41,420      
Cost Capitalized Subsequent to Acquisition 5,289      
Carrying Amount of Land 5,969      
Carrying Amount of Buildings and Improvements 46,181      
Accumulated Depreciation $ 8,676      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2006      
Seniors Housing Operating [Member] | Westford, MA, WSD2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,440      
Initial Cost of Buildings & Improvements 32,607      
Cost Capitalized Subsequent to Acquisition 148      
Carrying Amount of Land 1,468      
Carrying Amount of Buildings and Improvements 32,727      
Accumulated Depreciation $ 3,329      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 2013      
Seniors Housing Operating [Member] | Weston, MA, WTN Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,160      
Initial Cost of Buildings & Improvements 6,200      
Cost Capitalized Subsequent to Acquisition 1,240      
Carrying Amount of Land 1,160      
Carrying Amount of Buildings and Improvements 7,440      
Accumulated Depreciation $ 1,285      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Westworth Village, TX, WWV Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,060      
Initial Cost of Buildings & Improvements 31,296      
Cost Capitalized Subsequent to Acquisition 56      
Carrying Amount of Land 2,060      
Carrying Amount of Buildings and Improvements 31,352      
Accumulated Depreciation $ 2,523      
Year Acquired Jan. 01, 2014      
Year Built Jan. 01, 2014      
Seniors Housing Operating [Member] | Weybridge, UKJ, WEY Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 7,899      
Initial Cost of Buildings & Improvements 48,240      
Cost Capitalized Subsequent to Acquisition 5,667      
Carrying Amount of Land 8,662      
Carrying Amount of Buildings and Improvements 53,144      
Accumulated Depreciation $ 11,619      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2008      
Seniors Housing Operating [Member] | Weymouth, UKK, WYT Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,591      
Initial Cost of Buildings & Improvements 16,551      
Cost Capitalized Subsequent to Acquisition 1,912      
Carrying Amount of Land 2,879      
Carrying Amount of Buildings and Improvements 18,174      
Accumulated Depreciation $ 1,712      
Year Acquired Jan. 01, 2014      
Year Built Jan. 01, 2013      
Seniors Housing Operating [Member] | White Oak, MD, WHO Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,304      
Initial Cost of Buildings & Improvements 24,768      
Cost Capitalized Subsequent to Acquisition 1,747      
Carrying Amount of Land 2,316      
Carrying Amount of Buildings and Improvements 26,503      
Accumulated Depreciation $ 4,644      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2002      
Seniors Housing Operating [Member] | Wilbraham, MA, WIL Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 660      
Initial Cost of Buildings & Improvements 17,639      
Cost Capitalized Subsequent to Acquisition 931      
Carrying Amount of Land 685      
Carrying Amount of Buildings and Improvements 18,544      
Accumulated Depreciation $ 4,515      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 2000      
Seniors Housing Operating [Member] | Wilmington, DE, WGT2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,040      
Initial Cost of Buildings & Improvements 23,338      
Cost Capitalized Subsequent to Acquisition 867      
Carrying Amount of Land 1,129      
Carrying Amount of Buildings and Improvements 24,116      
Accumulated Depreciation $ 4,588      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2004      
Seniors Housing Operating [Member] | Winchester, UKJ, WNC Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 6,009      
Initial Cost of Buildings & Improvements 29,405      
Cost Capitalized Subsequent to Acquisition 3,647      
Carrying Amount of Land 6,598      
Carrying Amount of Buildings and Improvements 32,463      
Accumulated Depreciation $ 6,719      
Year Acquired Jan. 01, 2012      
Year Built Jan. 01, 2010      
Seniors Housing Operating [Member] | Winnipeg, MB, WNN Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 13,446      
Initial Cost of Land 1,960      
Initial Cost of Buildings & Improvements 38,612      
Cost Capitalized Subsequent to Acquisition 5,818      
Carrying Amount of Land 2,225      
Carrying Amount of Buildings and Improvements 44,164      
Accumulated Depreciation $ 12,378      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Winnipeg, MB, WNN2 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 16,833      
Initial Cost of Land 1,276      
Initial Cost of Buildings & Improvements 21,732      
Cost Capitalized Subsequent to Acquisition 3,031      
Carrying Amount of Land 1,466      
Carrying Amount of Buildings and Improvements 24,572      
Accumulated Depreciation $ 4,643      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 1988      
Seniors Housing Operating [Member] | Winnipeg, MB, WNN3 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 13,641      
Initial Cost of Land 1,317      
Initial Cost of Buildings & Improvements 15,609      
Cost Capitalized Subsequent to Acquisition 3,176      
Carrying Amount of Land 1,456      
Carrying Amount of Buildings and Improvements 18,645      
Accumulated Depreciation $ 2,899      
Year Acquired Jan. 01, 2015      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Woking, UKJ, WOK Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,172      
Initial Cost of Buildings & Improvements 13,233      
Cost Capitalized Subsequent to Acquisition 0      
Carrying Amount of Land 3,172      
Carrying Amount of Buildings and Improvements 13,233      
Accumulated Depreciation $ 0      
Year Acquired Jan. 01, 2016      
Year Built Jan. 01, 2017      
Seniors Housing Operating [Member] | Wolverhampton, UKG, WLV Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 2,941      
Initial Cost of Buildings & Improvements 8,922      
Cost Capitalized Subsequent to Acquisition 1,363      
Carrying Amount of Land 3,232      
Carrying Amount of Buildings and Improvements 9,994      
Accumulated Depreciation $ 2,856      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2008      
Seniors Housing Operating [Member] | Woodbridge, CT, WOB Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,370      
Initial Cost of Buildings & Improvements 14,219      
Cost Capitalized Subsequent to Acquisition 1,423      
Carrying Amount of Land 1,426      
Carrying Amount of Buildings and Improvements 15,586      
Accumulated Depreciation $ 5,225      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1998      
Seniors Housing Operating [Member] | Woodland Hills, CA, WDH Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,400      
Initial Cost of Buildings & Improvements 20,478      
Cost Capitalized Subsequent to Acquisition 947      
Carrying Amount of Land 3,447      
Carrying Amount of Buildings and Improvements 21,378      
Accumulated Depreciation $ 4,637      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2005      
Seniors Housing Operating [Member] | Worcester, MA, WRS4 Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 1,140      
Initial Cost of Buildings & Improvements 21,664      
Cost Capitalized Subsequent to Acquisition 1,057      
Carrying Amount of Land 1,166      
Carrying Amount of Buildings and Improvements 22,695      
Accumulated Depreciation $ 5,493      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Yarmouth, ME, YAR Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 450      
Initial Cost of Buildings & Improvements 27,711      
Cost Capitalized Subsequent to Acquisition 1,257      
Carrying Amount of Land 470      
Carrying Amount of Buildings and Improvements 28,948      
Accumulated Depreciation $ 6,586      
Year Acquired Jan. 01, 2011      
Year Built Jan. 01, 1999      
Seniors Housing Operating [Member] | Yonkers, NY, YNK Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 0      
Initial Cost of Land 3,962      
Initial Cost of Buildings & Improvements 50,107      
Cost Capitalized Subsequent to Acquisition 1,419      
Carrying Amount of Land 3,967      
Carrying Amount of Buildings and Improvements 51,521      
Accumulated Depreciation $ 9,381      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2005      
Seniors Housing Operating [Member] | Yorkton, SK, YKT Senior Housing Operating [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost of Encumbrances $ 3,493      
Initial Cost of Land 466      
Initial Cost of Buildings & Improvements 8,756      
Cost Capitalized Subsequent to Acquisition 1,128      
Carrying Amount of Land 511      
Carrying Amount of Buildings and Improvements 9,839      
Accumulated Depreciation $ 1,916      
Year Acquired Jan. 01, 2013      
Year Built Jan. 01, 2001      
[1]
Please see Note 2 to our consolidated financial statements for information regarding lives used for depreciation and amortization.