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Schedule III - Real Estate Investments and Accumulated Depreciation (Detail) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Initial costs, land 654,736,000      
Initial costs, buildings 4,644,787,000      
Additions subsequent to acquisition, Improvements 108,743,000      
Additions subsequent to acquisition, carrying costs 29,882,000      
Land at cost 673,253,000      
Buildings at cost 4,764,895,000      
Total at cost 5,438,148,000 [1] $ 3,968,042,000 $ 2,991,590,000 $ 2,040,727,000
Accumulated Depreciation 406,855,000 [2] $ 292,786,000 $ 232,675,000 $ 181,441,000
1994 [Member] | Bad Rappenau, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, buildings $ 10,455,000      
Buildings at cost 10,455,000      
Total at cost 10,455,000      
Accumulated Depreciation $ 1,067,000      
Date of Construction 1994      
Date Acquired Nov. 30, 2013      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1994 [Member] | Bad Liebenwerda, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 383,000      
Initial costs, buildings 19,755,000      
Land at cost 383,000      
Buildings at cost 19,755,000      
Total at cost 20,138,000      
Accumulated Depreciation $ 2,017,000      
Date of Construction 1994      
Date Acquired Nov. 30, 2013      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1994 [Member] | Grunheide, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,053,000      
Initial costs, buildings 44,867,000      
Additions subsequent to acquisition, Improvements 366,000      
Land at cost 3,419,000      
Buildings at cost 44,867,000      
Total at cost 48,286,000      
Accumulated Depreciation $ 2,770,000      
Date of Construction 1994      
Date Acquired Jul. 31, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1994 [Member] | Gyhum, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 4,286,000      
Initial costs, buildings 24,497,000      
Additions subsequent to acquisition, Improvements 377,000      
Land at cost 4,663,000      
Buildings at cost 24,497,000      
Total at cost 29,160,000      
Accumulated Depreciation $ 1,594,000      
Date of Construction 1994      
Date Acquired Jun. 30, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1994 [Member] | Hoppegarten, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 4,304,000      
Initial costs, buildings 26,655,000      
Additions subsequent to acquisition, Improvements 264,000      
Land at cost 4,568,000      
Buildings at cost 26,655,000      
Total at cost 31,223,000      
Accumulated Depreciation $ 1,653,000      
Date of Construction 1994      
Date Acquired Jul. 27, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1994 [Member] | Bad Lobenstein, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,914,000      
Initial costs, buildings 22,192,000      
Additions subsequent to acquisition, Improvements 198,000      
Land at cost 4,112,000      
Buildings at cost 22,192,000      
Total at cost 26,304,000      
Accumulated Depreciation $ 1,420,000      
Date of Construction 1994      
Date Acquired Jun. 30, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1994 [Member] | Lubstorf, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,094,000      
Initial costs, buildings 22,053,000      
Additions subsequent to acquisition, Improvements 173,000      
Land at cost 3,267,000      
Buildings at cost 22,053,000      
Total at cost 25,320,000      
Accumulated Depreciation $ 328,000      
Date of Construction 1994      
Date Acquired Jun. 01, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1996 [Member] | Dahlen, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 411,000      
Initial costs, buildings 22,674,000      
Land at cost 411,000      
Buildings at cost 22,674,000      
Total at cost 23,085,000      
Accumulated Depreciation $ 2,315,000      
Date of Construction 1996      
Date Acquired Nov. 30, 2013      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1996 [Member] | Wismar, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,830,000      
Initial costs, buildings 22,817,000      
Additions subsequent to acquisition, Improvements 216,000      
Land at cost 4,046,000      
Buildings at cost 22,817,000      
Total at cost 26,863,000      
Accumulated Depreciation $ 1,462,000      
Date of Construction 1996      
Date Acquired Jun. 30, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1996 [Member] | Bad Kosen, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 943,000      
Initial costs, buildings 8,026,000      
Additions subsequent to acquisition, Improvements 504,000      
Land at cost 1,447,000      
Buildings at cost 8,026,000      
Total at cost 9,473,000      
Accumulated Depreciation $ 273,000      
Date of Construction 1996      
Date Acquired Oct. 27, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1996 [Member] | Kevelaer, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,089,000      
Initial costs, buildings 7,746,000      
Additions subsequent to acquisition, Improvements 61,000      
Land at cost 1,150,000      
Buildings at cost 7,746,000      
Total at cost 8,896,000      
Accumulated Depreciation $ 115,000      
Date of Construction 1996      
Date Acquired Jun. 10, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1996 [Member] | McMinnville, OR [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 5,000,000      
Initial costs, buildings 97,900,000      
Land at cost 5,000,000      
Buildings at cost 97,900,000      
Total at cost 102,900,000      
Accumulated Depreciation $ 4,157,000      
Date of Construction 1996      
Date Acquired Aug. 31, 2015      
Life on which depreciation in latest income statements is computed (Years) 41 years      
1960 [Member] | Bad Durkheim, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,509,000      
Initial costs, buildings 16,587,000      
Land at cost 3,509,000      
Buildings at cost 16,587,000      
Total at cost 20,096,000      
Accumulated Depreciation $ 1,693,000      
Date of Construction 1960      
Date Acquired Nov. 30, 2013      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1960 [Member] | Nordrach, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 336,000      
Initial costs, buildings 3,216,000      
Additions subsequent to acquisition, Improvements 90,000      
Land at cost 426,000      
Buildings at cost 3,216,000      
Total at cost 3,642,000      
Accumulated Depreciation $ 216,000      
Date of Construction 1960      
Date Acquired Jul. 07, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1960 [Member] | Bad Durrheim, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,537,000      
Initial costs, buildings 12,599,000      
Additions subsequent to acquisition, Improvements 252,000      
Land at cost 1,789,000      
Buildings at cost 12,599,000      
Total at cost 14,388,000      
Accumulated Depreciation $ 802,000      
Date of Construction 1960      
Date Acquired Jul. 24, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1960 [Member] | Bad Pyrmont, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,055,000      
Initial costs, buildings 21,790,000      
Additions subsequent to acquisition, Improvements 170,000      
Land at cost 3,225,000      
Buildings at cost 21,790,000      
Total at cost 25,015,000      
Accumulated Depreciation $ 324,000      
Date of Construction 1960      
Date Acquired Jun. 01, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1960 [Member] | Daun, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,475,000      
Initial costs, buildings 10,484,000      
Additions subsequent to acquisition, Improvements 82,000      
Land at cost 1,557,000      
Buildings at cost 10,484,000      
Total at cost 12,041,000      
Accumulated Depreciation $ 156,000      
Date of Construction 1960      
Date Acquired Jun. 15, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1960 [Member] | Houston, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 3,501,000      
Initial costs, buildings 34,530,000      
Additions subsequent to acquisition, Improvements 8,477,000      
Additions subsequent to acquisition, carrying costs 16,589,000      
Land at cost 3,274,000      
Buildings at cost 59,823,000      
Total at cost 63,097,000      
Accumulated Depreciation $ 11,303,000      
Date of Construction 1960      
Date Acquired Aug. 10, 2007      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1960 [Member] | Sherman, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 4,491,000      
Initial costs, buildings 24,802,000      
Land at cost 4,491,000      
Buildings at cost 24,802,000      
Total at cost 29,293,000      
Accumulated Depreciation $ 2,061,000      
Date of Construction 1960      
Date Acquired Oct. 31, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1981 [Member] | Bad Durkheim, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,054,000      
Initial costs, buildings 21,727,000      
Additions subsequent to acquisition, Improvements 171,000      
Land at cost 3,225,000      
Buildings at cost 21,727,000      
Total at cost 24,952,000      
Accumulated Depreciation $ 277,000      
Date of Construction 1981      
Date Acquired Jul. 07, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1981 [Member] | Ortenberg, Germany[Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 101,000      
Initial costs, buildings 5,787,000      
Land at cost 101,000      
Buildings at cost 5,787,000      
Total at cost 5,888,000      
Accumulated Depreciation $ 591,000      
Date of Construction 1981      
Date Acquired Nov. 30, 2013      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1977 [Member] | Wiesbaden, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,402,000      
Initial costs, buildings 16,362,000      
Land at cost 3,402,000      
Buildings at cost 16,362,000      
Total at cost 19,764,000      
Accumulated Depreciation $ 1,670,000      
Date of Construction 1977      
Date Acquired Nov. 30, 2013      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1977 [Member] | Braunfels, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 2,305,000      
Initial costs, buildings 14,733,000      
Additions subsequent to acquisition, Improvements 60,000      
Land at cost 2,365,000      
Buildings at cost 14,733,000      
Total at cost 17,098,000      
Accumulated Depreciation $ 931,000      
Date of Construction 1977      
Date Acquired Jun. 30, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1977 [Member] | Ban Nauheim, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,397,000      
Initial costs, buildings 17,163,000      
Additions subsequent to acquisition, Improvements 156,000      
Land at cost 3,553,000      
Buildings at cost 17,163,000      
Total at cost 20,716,000      
Accumulated Depreciation $ 1,099,000      
Date of Construction 1977      
Date Acquired Jun. 30, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1977 [Member] | Neunkirchen, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,108,000      
Initial costs, buildings 22,198,000      
Additions subsequent to acquisition, Improvements 173,000      
Land at cost 3,281,000      
Buildings at cost 22,198,000      
Total at cost 25,479,000      
Accumulated Depreciation $ 378,000      
Date of Construction 1977      
Date Acquired May 13, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1992 [Member] | Bad Durkheim, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, buildings $ 32,826,000      
Buildings at cost 32,826,000      
Total at cost 32,826      
Accumulated Depreciation $ 3,351,000      
Date of Construction 1992      
Date Acquired Nov. 30, 2013      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1992 [Member] | Bad Liebenstein, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,774,000      
Initial costs, buildings 37,482,000      
Land at cost 1,774,000      
Buildings at cost 37,482,000      
Total at cost 39,256,000      
Accumulated Depreciation $ 2,967,000      
Date of Construction 1992      
Date Acquired Nov. 05, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1992 [Member] | Bad Kosen, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 840,000      
Initial costs, buildings 8,380,000      
Additions subsequent to acquisition, Improvements 60,000      
Land at cost 900,000      
Buildings at cost 8,380,000      
Total at cost 9,280,000      
Accumulated Depreciation $ 249,000      
Date of Construction 1992      
Date Acquired Oct. 27, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1992 [Member] | Ravensrush, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,062,000      
Initial costs, buildings 2,993,000      
Additions subsequent to acquisition, Improvements 90,000      
Land at cost 1,152,000      
Buildings at cost 2,993,000      
Total at cost 4,145,000      
Accumulated Depreciation $ 81,000      
Date of Construction 1992      
Date Acquired Dec. 31, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1992 [Member] | Wichita, KS [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,019,000      
Initial costs, buildings 18,373,000      
Additions subsequent to acquisition, carrying costs 1,000      
Land at cost 1,019,000      
Buildings at cost 18,374,000      
Total at cost 19,393,000      
Accumulated Depreciation $ 4,478,000      
Date of Construction 1992      
Date Acquired Apr. 04, 2008      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1904 [Member] | Bad Liebenwerda, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 595,000      
Initial costs, buildings 16,516,000      
Land at cost 595,000      
Buildings at cost 16,516,000      
Total at cost 17,111,000      
Accumulated Depreciation $ 1,686,000      
Date of Construction 1904      
Date Acquired Nov. 30, 2013      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1995 [Member] | Bad Liebenwerda, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 595,000      
Initial costs, buildings 16,516,000      
Land at cost 595,000      
Buildings at cost 16,516,000      
Total at cost 17,111,000      
Accumulated Depreciation $ 1,686,000      
Date of Construction 1995      
Date Acquired Nov. 30, 2013      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1995 [Member] | Bad Mergentheim, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, buildings $ 12,432,000      
Buildings at cost 12,432,000      
Total at cost 12,432,000      
Accumulated Depreciation $ 958,000      
Date of Construction 1995      
Date Acquired Dec. 11, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1995 [Member] | Flechtingen, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,073,000      
Initial costs, buildings 24,303,000      
Additions subsequent to acquisition, Improvements 240,000      
Land at cost 3,313,000      
Buildings at cost 24,303,000      
Total at cost 27,616,000      
Accumulated Depreciation $ 1,559,000      
Date of Construction 1995      
Date Acquired Jun. 30, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1995 [Member] | Heiligendamm, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 4,622,000      
Initial costs, buildings 28,805,000      
Additions subsequent to acquisition, Improvements 228,000      
Land at cost 4,850,000      
Buildings at cost 28,805,000      
Total at cost 33,655,000      
Accumulated Depreciation $ 1,838,000      
Date of Construction 1995      
Date Acquired Jun. 30, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1995 [Member] | Kalbe, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,758,000      
Initial costs, buildings 25,106,000      
Additions subsequent to acquisition, Improvements 180,000      
Land at cost 3,938,000      
Buildings at cost 25,106,000      
Total at cost 29,044,000      
Accumulated Depreciation $ 1,599,000      
Date of Construction 1995      
Date Acquired Jul. 06, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1995 [Member] | Vitense-Parber, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospita      
Initial costs, land $ 864,000      
Initial costs, buildings 4,197,000      
Additions subsequent to acquisition, Improvements 84,000      
Land at cost 948,000      
Buildings at cost 4,197,000      
Total at cost 5,145,000      
Accumulated Depreciation $ 111,000      
Date of Construction 1995      
Date Acquired Dec. 31, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1980 [Member] | Bad Durkheim, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 805,000      
Initial costs, buildings 7,234,000      
Land at cost 805,000      
Buildings at cost 7,234,000      
Total at cost 8,039,000      
Accumulated Depreciation $ 738,000      
Date of Construction 1980      
Date Acquired Nov. 30, 2013      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1980 [Member] | Bad Bertrich, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 546,000      
Initial costs, buildings 4,424,000      
Additions subsequent to acquisition, Improvements 72,000      
Land at cost 618,000      
Buildings at cost 4,424,000      
Total at cost 5,042,000      
Accumulated Depreciation $ 125,000      
Date of Construction 1980      
Date Acquired Nov. 30, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1980 [Member] | Blue Springs, MO [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 4,347,000      
Initial costs, buildings 23,494,000      
Land at cost 4,347,000      
Buildings at cost 23,494,000      
Total at cost 27,841,000      
Accumulated Depreciation $ 1,800,000      
Date of Construction 1980      
Date Acquired Feb. 13, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1980 [Member] | Hill County, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 1,120,000      
Initial costs, buildings 17,882,000      
Land at cost 1,120,000      
Buildings at cost 17,882,000      
Total at cost 19,002,000      
Accumulated Depreciation $ 8,691,000      
Date of Construction 1980      
Date Acquired Sep. 17, 2010      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1980 [Member] | Poplar Bluff, MO [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 2,659,000      
Initial costs, buildings 38,694,000      
Additions subsequent to acquisition, carrying costs 1,000      
Land at cost 2,660,000      
Buildings at cost 38,694,000      
Total at cost 41,354,000      
Accumulated Depreciation $ 9,370,000      
Date of Construction 1980      
Date Acquired Apr. 22, 2008      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1980 [Member] | Sharon, PA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 6,179,000      
Initial costs, buildings 9,066,000      
Land at cost 6,179,000      
Buildings at cost 9,066,000      
Total at cost 15,245,000      
Accumulated Depreciation $ 435,000      
Date of Construction 1980      
Date Acquired May 01, 2017      
Life on which depreciation in latest income statements is computed (Years) 41 years      
1980 [Member] | West Valley City, UT [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 5,516,000      
Initial costs, buildings 58,314,000      
Additions subsequent to acquisition, Improvements 2,036,000      
Additions subsequent to acquisition, carrying costs (114,000)      
Land at cost 5,402,000      
Buildings at cost 60,350,000      
Total at cost 65,752,000      
Accumulated Depreciation $ 14,237,000      
Date of Construction 1980      
Date Acquired Apr. 22, 2008      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1930 [Member] | Bad Durkheim, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 6,448,000      
Initial costs, buildings 17,804,000      
Land at cost 6,448,000      
Buildings at cost 17,804,000      
Total at cost 24,252,000      
Accumulated Depreciation $ 1,818,000      
Date of Construction 1930      
Date Acquired Nov. 30, 2013      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1930 [Member] | Bad Hersfield, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 438,000      
Initial costs, buildings 4,385,000      
Additions subsequent to acquisition, Improvements 96,000      
Land at cost 534,000      
Buildings at cost 4,385,000      
Total at cost 4,919,000      
Accumulated Depreciation $ 116,000      
Date of Construction 1930      
Date Acquired Dec. 31, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1930 [Member] | Easton, PA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 13,898,000      
Initial costs, buildings 40,245,000      
Land at cost 13,898,000      
Buildings at cost 40,245,000      
Total at cost 54,143,000      
Accumulated Depreciation $ 710,000      
Date of Construction 1930      
Date Acquired May 01, 2017      
Life on which depreciation in latest income statements is computed (Years) 41 years      
1986 [Member] | Bad Rappenau, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,780,000      
Initial costs, buildings 6,440,000      
Land at cost 3,780,000      
Buildings at cost 6,440,000      
Total at cost 10,220,000      
Accumulated Depreciation $ 657,000      
Date of Construction 1986      
Date Acquired Nov. 30, 2013      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1974 [Member] | Wiesbaden, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,776,000      
Initial costs, buildings 8,242,000      
Additions subsequent to acquisition, Improvements 3,104,000      
Land at cost 1,818,000      
Buildings at cost 11,304,000      
Total at cost 13,122,000      
Accumulated Depreciation $ 562,000      
Date of Construction 1974      
Date Acquired Jun. 30, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1974 [Member] | Bad Tolz, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 2,436,000      
Initial costs, buildings 10,273,000      
Additions subsequent to acquisition, Improvements 214,000      
Land at cost 2,436,000      
Buildings at cost 10,487,000      
Total at cost 12,923,000      
Accumulated Depreciation $ 808,000      
Date of Construction 1974      
Date Acquired Nov. 19, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1974 [Member] | Bad Soden-Salmunster, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,032,000      
Initial costs, buildings 7,164,000      
Additions subsequent to acquisition, Improvements 132,000      
Land at cost 1,164,000      
Buildings at cost 7,164,000      
Total at cost 8,328,000      
Accumulated Depreciation $ 470,000      
Date of Construction 1974      
Date Acquired Jun. 30, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1974 [Member] | Bad Salzuflen, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 5,601,000      
Initial costs, buildings 41,854,000      
Additions subsequent to acquisition, Improvements 372,000      
Land at cost 5,973,000      
Buildings at cost 41,854,000      
Total at cost 47,827,000      
Accumulated Depreciation $ 90,000      
Date of Construction 1974      
Date Acquired Nov. 30, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1974 [Member] | Redding, CA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 1,555,000      
Initial costs, buildings 53,863,000      
Additions subsequent to acquisition, carrying costs 13,000      
Land at cost 1,555,000      
Buildings at cost 53,876,000      
Total at cost 55,431,000      
Accumulated Depreciation $ 14,039,000      
Date of Construction 1974      
Date Acquired Aug. 10, 2007      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1974 [Member] | Sebastian, FL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 5,733,000      
Initial costs, buildings 49,136,000      
Land at cost 5,733,000      
Buildings at cost 49,136,000      
Total at cost 54,869,000      
Accumulated Depreciation $ 910,000      
Date of Construction 1974      
Date Acquired May 01, 2017      
Life on which depreciation in latest income statements is computed (Years) 41 years      
1954 [Member] | Bad Liebenstein, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,774,000      
Initial costs, buildings 37,482,000      
Land at cost 1,774,000      
Buildings at cost 37,482,000      
Total at cost 39,256,000      
Accumulated Depreciation $ 2,967,000      
Date of Construction 1954      
Date Acquired Nov. 05, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1954 [Member] | Camden, SC [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, buildings $ 22,739,000      
Buildings at cost 22,739,000      
Total at cost 22,739,000      
Accumulated Depreciation $ 972,000      
Date of Construction 1954      
Date Acquired Oct. 30, 2015      
Life on which depreciation in latest income statements is computed (Years) 39 years      
1988 [Member] | Bad Mergentheim, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, buildings $ 12,432,000      
Buildings at cost 12,432,000      
Total at cost 12,432,000      
Accumulated Depreciation $ 958,000      
Date of Construction 1988      
Date Acquired Dec. 11, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2008 [Member] | Bath, UK [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 1,602,000      
Initial costs, buildings 33,197,000      
Land at cost 1,602,000      
Buildings at cost 33,197,000      
Total at cost 34,799,000      
Accumulated Depreciation $ 2,906,000      
Date of Construction 2008      
Date Acquired Jul. 01, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2008 [Member] | Bad Krozingen, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,627,000      
Initial costs, buildings 11,863,000      
Additions subsequent to acquisition, Improvements 126,000      
Land at cost 1,753,000      
Buildings at cost 11,863,000      
Total at cost 13,616,000      
Accumulated Depreciation $ 737,000      
Date of Construction 2008      
Date Acquired Jul. 24, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2008 [Member] | DeSoto, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Long term acute care hospital      
Initial costs, land $ 1,067,000      
Initial costs, buildings 10,701,000      
Additions subsequent to acquisition, Improvements 86,000      
Additions subsequent to acquisition, carrying costs 8,000      
Land at cost 1,161,000      
Buildings at cost 10,701,000      
Total at cost 11,862,000      
Accumulated Depreciation $ 1,750,000      
Date of Construction 2008      
Date Acquired Jul. 18, 2011      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2008 [Member] | Lubbock, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation Hospital      
Initial costs, land $ 1,376,000      
Initial costs, buildings 28,292,000      
Additions subsequent to acquisition, Improvements 3,648,000      
Land at cost 1,376,000      
Buildings at cost 31,940,000      
Total at cost 33,316,000      
Accumulated Depreciation $ 1,844,000      
Date of Construction 2008      
Date Acquired Jun. 16, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2009 [Member] | Bath, UK [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospita      
Initial costs, land $ 1,602,000      
Initial costs, buildings 33,197,000      
Land at cost 1,602,000      
Buildings at cost 33,197,000      
Total at cost 34,799,000      
Accumulated Depreciation $ 2,906,000      
Date of Construction 2009      
Date Acquired Jul. 01, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2009 [Member] | Daun, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,475,000      
Initial costs, buildings 10,484,000      
Additions subsequent to acquisition, Improvements 82,000      
Land at cost 1,557,000      
Buildings at cost 10,484,000      
Total at cost 12,041,000      
Accumulated Depreciation $ 156,000      
Date of Construction 2009      
Date Acquired Jun. 15, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2009 [Member] | Brighton, MA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 18,540,000      
Initial costs, buildings 146,490,000      
Additions subsequent to acquisition, Improvements 836,000      
Land at cost 18,540,000      
Buildings at cost 147,326,000      
Total at cost 165,866,000      
Accumulated Depreciation $ 4,584,000      
Date of Construction 2009      
Date Acquired Oct. 03, 2016      
Life on which depreciation in latest income statements is computed (Years) 41 years      
1956 [Member] | Ottenhofen, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 2,490,000      
Initial costs, buildings 14,015,000      
Additions subsequent to acquisition, Improvements 120,000      
Land at cost 2,610,000      
Buildings at cost 14,015,000      
Total at cost 16,625,000      
Accumulated Depreciation $ 896,000      
Date of Construction 1956      
Date Acquired Jul. 03, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1956 [Member] | Detroit, MI [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Long term acute care hospital      
Initial costs, land $ 1,220,000      
Initial costs, buildings 8,687,000      
Additions subsequent to acquisition, carrying costs (365,000)      
Land at cost 1,220,000      
Buildings at cost 8,322,000      
Total at cost 9,542,000      
Accumulated Depreciation $ 2,068,000      
Date of Construction 1956      
Date Acquired May 22, 2008      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1957 [Member] | Ottenhofen, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabitation hospital      
Initial costs, land $ 2,490,000      
Initial costs, buildings 14,015,000      
Additions subsequent to acquisition, Improvements 120,000      
Land at cost 2,610,000      
Buildings at cost 14,015,000      
Total at cost 16,625,000      
Accumulated Depreciation $ 896,000      
Date of Construction 1957      
Date Acquired Jul. 03, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1997 [Member] | Bad Berka, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,565,000      
Initial costs, buildings 16,630,000      
Additions subsequent to acquisition, Improvements 186,000      
Land at cost 3,751,000      
Buildings at cost 16,630,000      
Total at cost 20,381,000      
Accumulated Depreciation $ 1,035,000      
Date of Construction 1997      
Date Acquired Jul. 22, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1997 [Member] | Bad Kosen, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 486,000      
Initial costs, buildings 5,024,000      
Additions subsequent to acquisition, Improvements 414,000      
Land at cost 900,000      
Buildings at cost 5,024,000      
Total at cost 5,924,000      
Accumulated Depreciation $ 179,000      
Date of Construction 1997      
Date Acquired Oct. 27, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1993 [Member] | Bad Lausick, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,914,000      
Initial costs, buildings 17,324,000      
Additions subsequent to acquisition, Improvements 168,000      
Land at cost 2,082,000      
Buildings at cost 17,324,000      
Total at cost 19,406,000      
Accumulated Depreciation $ 1,111,000      
Date of Construction 1993      
Date Acquired Jun. 30, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1993 [Member] | Bad Sulze, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 2,538,000      
Initial costs, buildings 21,899,000      
Additions subsequent to acquisition, Improvements 216,000      
Land at cost 2,754,000      
Buildings at cost 21,899,000      
Total at cost 24,653,000      
Accumulated Depreciation $ 1,405,000      
Date of Construction 1993      
Date Acquired Jun. 30, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1993 [Member] | Kurort Berggiebhubel, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,385,000      
Initial costs, buildings 17,078,000      
Additions subsequent to acquisition, Improvements 150,000      
Land at cost 3,535,000      
Buildings at cost 17,078,000      
Total at cost 20,613,000      
Accumulated Depreciation $ 1,057,000      
Date of Construction 1993      
Date Acquired Jul. 21, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1993 [Member] | Bernkastel-Kues, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 864,000      
Initial costs, buildings 12,471,000      
Additions subsequent to acquisition, Improvements 144,000      
Land at cost 1,008,000      
Buildings at cost 12,471,000      
Total at cost 13,479,000      
Accumulated Depreciation $ 803,000      
Date of Construction 1993      
Date Acquired Jul. 14, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1993 [Member] | Flechtingen, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,073,000      
Initial costs, buildings 15,513,000      
Additions subsequent to acquisition, Improvements 162,000      
Land at cost 3,235,000      
Buildings at cost 15,513,000      
Total at cost 18,748,000      
Accumulated Depreciation $ 997,000      
Date of Construction 1993      
Date Acquired Jun. 30, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1993 [Member] | Bad Tennstedt, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 4,064,000      
Initial costs, buildings 30,130,000      
Additions subsequent to acquisition, Improvements 222,000      
Land at cost 4,286,000      
Buildings at cost 30,130,000      
Total at cost 34,416,000      
Accumulated Depreciation $ 1,920,000      
Date of Construction 1993      
Date Acquired Jun. 30, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1982 [Member] | Bernkastel-Kues, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,866,000      
Initial costs, buildings 16,790,000      
Additions subsequent to acquisition, Improvements 48,000      
Land at cost 3,914,000      
Buildings at cost 16,790,000      
Total at cost 20,704,000      
Accumulated Depreciation $ 1,022,000      
Date of Construction 1982      
Date Acquired Jul. 15, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1982 [Member] | Bossier City, LA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Long term acute care hospital      
Initial costs, land $ 900,000      
Initial costs, buildings 17,818,000      
Land at cost 900,000      
Buildings at cost 17,818,000      
Total at cost 18,718,000      
Accumulated Depreciation $ 4,341,000      
Date of Construction 1982      
Date Acquired Apr. 01, 2008      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1982 [Member] | Cheraw, SC [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 657,000      
Initial costs, buildings 19,576,000      
Land at cost 657,000      
Buildings at cost 19,576,000      
Total at cost 20,233,000      
Accumulated Depreciation $ 4,700,000      
Date of Construction 1982      
Date Acquired Apr. 01, 2008      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1982 [Member] | Garden Grove, CA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 5,502,000      
Initial costs, buildings 10,748,000      
Additions subsequent to acquisition, carrying costs 51,000      
Land at cost 5,502,000      
Buildings at cost 10,799,000      
Total at cost 16,301,000      
Accumulated Depreciation $ 2,466,000      
Date of Construction 1982      
Date Acquired Nov. 25, 2008      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1982 [Member] | Warren, OH [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 5,385,000      
Initial costs, buildings 47,588,000      
Land at cost 5,385,000      
Buildings at cost 47,588,000      
Total at cost 52,973,000      
Accumulated Depreciation $ 997,000      
Date of Construction 1982      
Date Acquired May 01, 2017      
Life on which depreciation in latest income statements is computed (Years) 41 years      
1993 One [Member] | Flechtingen, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,073,000      
Initial costs, buildings 24,303,000      
Additions subsequent to acquisition, Improvements 240,000      
Land at cost 3,313,000      
Buildings at cost 24,303,000      
Total at cost 27,616,000      
Accumulated Depreciation $ 1,559,000      
Date of Construction 1993      
Date Acquired Jun. 30, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1913 [Member] | Bad Gottleuba, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 57,000      
Initial costs, buildings 16,508,000      
Additions subsequent to acquisition, Improvements 954,000      
Land at cost 1,011,000      
Buildings at cost 16,508,000      
Total at cost 17,519,000      
Accumulated Depreciation $ 953,000      
Date of Construction 1913      
Date Acquired Dec. 16, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1913 [Member] | Sherman, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 4,491,000      
Initial costs, buildings 24,802,000      
Land at cost 4,491,000      
Buildings at cost 24,802,000      
Total at cost 29,293,000      
Accumulated Depreciation $ 2,061,000      
Date of Construction 1913      
Date Acquired Oct. 31, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2014 [Member] | Grunheide, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,053,000      
Initial costs, buildings 44,867,000      
Additions subsequent to acquisition, Improvements 366,000      
Land at cost 3,419,000      
Buildings at cost 44,867,000      
Total at cost 48,286,000      
Accumulated Depreciation $ 2,770,000      
Date of Construction 2014      
Date Acquired Jul. 31, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2014 [Member] | Magdeburg, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 15,901,000      
Initial costs, buildings 58,985,000      
Additions subsequent to acquisition, Improvements 276,000      
Land at cost 16,177,000      
Buildings at cost 58,985,000      
Total at cost 75,162,000      
Accumulated Depreciation $ 3,608,000      
Date of Construction 2014      
Date Acquired Jul. 22, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2014 [Member] | Bad Hersfield, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 438,000      
Initial costs, buildings 4,385,000      
Additions subsequent to acquisition, Improvements 96,000      
Land at cost 534,000      
Buildings at cost 4,385,000      
Total at cost 4,919,000      
Accumulated Depreciation $ 116,000      
Date of Construction 2014      
Date Acquired Dec. 31, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2014 [Member] | Houston, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 1,345,000      
Initial costs, buildings 3,678,000      
Land at cost 1,345,000      
Buildings at cost 3,678,000      
Total at cost 5,023,000      
Accumulated Depreciation $ 322,000      
Date of Construction 2014      
Date Acquired Jun. 20, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2014 [Member] | Allen, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 1,550,000      
Initial costs, buildings 3,921,000      
Land at cost 1,550,000      
Buildings at cost 3,921,000      
Total at cost 5,471,000      
Accumulated Depreciation $ 343,000      
Date of Construction 2014      
Date Acquired Jul. 14, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2014 [Member] | Alvin, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 105,000      
Initial costs, buildings 4,087,000      
Land at cost 105,000      
Buildings at cost 4,087,000      
Total at cost 4,192,000      
Accumulated Depreciation $ 360,000      
Date of Construction 2014      
Date Acquired Mar. 19, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2014 [Member] | Austin, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 1,140,000      
Initial costs, buildings 3,853,000      
Land at cost 1,140,000      
Buildings at cost 3,853,000      
Total at cost 4,993,000      
Accumulated Depreciation $ 345,000      
Date of Construction 2014      
Date Acquired May 29, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2014 [Member] | Broomfield, CO [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 825,000      
Initial costs, buildings 3,895,000      
Land at cost 825,000      
Buildings at cost 3,895,000      
Total at cost 4,720,000      
Accumulated Depreciation $ 341,000      
Date of Construction 2014      
Date Acquired Jul. 03, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2014 [Member] | Cedar Hill, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 1,122,000      
Initial costs, buildings 3,644,000      
Land at cost 1,122,000      
Buildings at cost 3,644,000      
Total at cost 4,766,000      
Accumulated Depreciation $ 319,000      
Date of Construction 2014      
Date Acquired Jun. 23, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2014 [Member] | Spring, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 1,310,000      
Initial costs, buildings 3,583,000      
Land at cost 1,310,000      
Buildings at cost 3,583,000      
Total at cost 4,893,000      
Accumulated Depreciation $ 314,000      
Date of Construction 2014      
Date Acquired Jul. 15, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2014 [Member] | Commerce City, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 707,000      
Initial costs, buildings 4,248,000      
Land at cost 707,000      
Buildings at cost 4,248,000      
Total at cost 4,955,000      
Accumulated Depreciation $ 327,000      
Date of Construction 2014      
Date Acquired Dec. 11, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2014 [Member] | Dulles, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 1,076,000      
Initial costs, buildings 3,784,000      
Land at cost 1,076,000      
Buildings at cost 3,784,000      
Total at cost 4,860,000      
Accumulated Depreciation $ 315,000      
Date of Construction 2014      
Date Acquired Sep. 12, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2014 [Member] | Firestone, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 495,000      
Initial costs, buildings 3,963,000      
Land at cost 495,000      
Buildings at cost 3,963,000      
Total at cost 4,458,000      
Accumulated Depreciation $ 355,000      
Date of Construction 2014      
Date Acquired Jun. 06, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2014 [Member] | Fountain, CO [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 1,508,000      
Initial costs, buildings 4,131,000      
Land at cost 1,508,000      
Buildings at cost 4,131,000      
Total at cost 5,639,000      
Accumulated Depreciation $ 353,000      
Date of Construction 2014      
Date Acquired Jul. 31, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2014 [Member] | Frisco, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 1,500,000      
Initial costs, buildings 3,863,000      
Additions subsequent to acquisition, Improvements 27,000      
Additions subsequent to acquisition, carrying costs (89,000)      
Land at cost 1,411,000      
Buildings at cost 3,890,000      
Total at cost 5,301,000      
Accumulated Depreciation $ 348,000      
Date of Construction 2014      
Date Acquired Jun. 13, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2014 [Member] | Colorado Springs, CO [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 600,000      
Initial costs, buildings 4,231,000      
Land at cost 600,000      
Buildings at cost 4,231,000      
Total at cost 4,831,000      
Accumulated Depreciation $ 379,000      
Date of Construction 2014      
Date Acquired Jun. 05, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2014 [Member] | San Antonio, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 351,000      
Initial costs, buildings 3,952,000      
Land at cost 351,000      
Buildings at cost 3,952,000      
Total at cost 4,303,000      
Accumulated Depreciation $ 369,000      
Date of Construction 2014      
Date Acquired Jan. 01, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2014 [Member] | Altoona, WI [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, buildings $ 29,062,000      
Buildings at cost 29,062,000      
Total at cost 29,062,000      
Accumulated Depreciation $ 2,422,000      
Date of Construction 2014      
Date Acquired Aug. 31, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2014 [Member] | Ogden, UT [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,759,000      
Initial costs, buildings 16,414,000      
Land at cost 1,759,000      
Buildings at cost 16,414,000      
Total at cost 18,173,000      
Accumulated Depreciation $ 1,560,000      
Date of Construction 2014      
Date Acquired Mar. 01, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2014 [Member] | Pearland, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 1,075,000      
Initial costs, buildings 3,577,000      
Land at cost 1,075,000      
Buildings at cost 3,577,000      
Total at cost 4,652,000      
Accumulated Depreciation $ 298,000      
Date of Construction 2014      
Date Acquired Sep. 08, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2014 [Member] | Sienna, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 999,000      
Initial costs, buildings 3,591,000      
Land at cost 999,000      
Buildings at cost 3,591,000      
Total at cost 4,590,000      
Accumulated Depreciation $ 299,000      
Date of Construction 2014      
Date Acquired Aug. 20, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2014 [Member] | Thornton, CO [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 1,350,000      
Initial costs, buildings 4,259,000      
Land at cost 1,350,000      
Buildings at cost 4,259,000      
Total at cost 5,609,000      
Accumulated Depreciation $ 355,000      
Date of Construction 2014      
Date Acquired Aug. 29, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1900 [Member] | Baden-Baden, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,405,000      
Initial costs, buildings 9,876,000      
Additions subsequent to acquisition, Improvements 138,000      
Land at cost 1,543,000      
Buildings at cost 9,876,000      
Total at cost 11,419,000      
Accumulated Depreciation $ 640,000      
Date of Construction 1900      
Date Acquired Jun. 30, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1900 [Member] | Hannover, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,518,000      
Initial costs, buildings 16,622,000      
Additions subsequent to acquisition, Improvements 342,000      
Land at cost 3,860,000      
Buildings at cost 16,622,000      
Total at cost 20,482,000      
Accumulated Depreciation $ 913,000      
Date of Construction 1900      
Date Acquired Dec. 01, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1900 [Member] | Lubeck, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,164,000      
Initial costs, buildings 5,235,000      
Additions subsequent to acquisition, Improvements 30,000      
Land at cost 1,194,000      
Buildings at cost 5,235,000      
Total at cost 6,429,000      
Accumulated Depreciation $ 133,000      
Date of Construction 1900      
Date Acquired Dec. 31, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1900 [Member] | Oppenweiler, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 2,152,000      
Initial costs, buildings 15,349,000      
Additions subsequent to acquisition, Improvements 121,000      
Land at cost 2,273,000      
Buildings at cost 15,349,000      
Total at cost 17,622,000      
Accumulated Depreciation $ 163,000      
Date of Construction 1900      
Date Acquired Jul. 28, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2002 [Member] | Baden-Baden, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitatio hospital      
Initial costs, land $ 1,405,000      
Initial costs, buildings 9,876,000      
Additions subsequent to acquisition, Improvements 138,000      
Land at cost 1,543,000      
Buildings at cost 9,876,000      
Total at cost 11,419,000      
Accumulated Depreciation $ 640,000      
Date of Construction 2002      
Date Acquired Jun. 30, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2002 [Member] | Idaho Falls, ID [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 1,822,000      
Initial costs, buildings 37,467,000      
Additions subsequent to acquisition, carrying costs 4,665,000      
Land at cost 1,822,000      
Buildings at cost 42,132,000      
Total at cost 43,954,000      
Accumulated Depreciation $ 10,143,000      
Date of Construction 2002      
Date Acquired Apr. 01, 2008      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2002 [Member] | Melbourne, FL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 5,642,000      
Initial costs, buildings 17,087,000      
Land at cost 5,642,000      
Buildings at cost 17,087,000      
Total at cost 22,729,000      
Accumulated Depreciation $ 363,000      
Date of Construction 2002      
Date Acquired May 01, 2017      
Life on which depreciation in latest income statements is computed (Years) 42 years      
2002 [Member] | San Antonio, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 8,053,000      
Initial costs, buildings 29,333,000      
Land at cost 8,053,000      
Buildings at cost 29,333,000      
Total at cost 37,386,000      
Accumulated Depreciation $ 204,000      
Date of Construction 2002      
Date Acquired Sep. 29, 2017      
Life on which depreciation in latest income statements is computed (Years) 41 years      
2003 [Member] | Baden-Baden, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,405,000      
Initial costs, buildings 9,876,000      
Additions subsequent to acquisition, Improvements 138,000      
Land at cost 1,543,000      
Buildings at cost 9,876,000      
Total at cost 11,419,000      
Accumulated Depreciation $ 640,000      
Date of Construction 2003      
Date Acquired Jun. 30, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2003 [Member] | Youngstown, OH [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 4,335,000      
Initial costs, buildings 3,565,000      
Land at cost 4,335,000      
Buildings at cost 3,565,000      
Total at cost 7,900,000      
Accumulated Depreciation $ 385,000      
Date of Construction 2003      
Date Acquired May 01, 2017      
Life on which depreciation in latest income statements is computed (Years) 41 years      
Renovations in 1997 [Member] | Hannover, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,518,000      
Initial costs, buildings 16,622,000      
Additions subsequent to acquisition, Improvements 342,000      
Land at cost 3,860,000      
Buildings at cost 16,622,000      
Total at cost 20,482,000      
Accumulated Depreciation $ 913,000      
Date of Construction 1997      
Date Acquired Dec. 01, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
Renovations in 2000 [Member] | Hannover, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,518,000      
Initial costs, buildings 16,622,000      
Additions subsequent to acquisition, Improvements 342,000      
Land at cost 3,860,000      
Buildings at cost 16,622,000      
Total at cost 20,482,000      
Accumulated Depreciation $ 913,000      
Date of Construction 2000      
Date Acquired Dec. 01, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
Renovations in 2009 [Member] | Hannover, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,518,000      
Initial costs, buildings 16,622,000      
Additions subsequent to acquisition, Improvements 342,000      
Land at cost 3,860,000      
Buildings at cost 16,622,000      
Total at cost 20,482,000      
Accumulated Depreciation $ 913,000      
Date of Construction 2009      
Date Acquired Dec. 01, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1973 [Member] | Bad Camberg, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 2,240,000      
Initial costs, buildings 17,072,000      
Additions subsequent to acquisition, Improvements 3,717,000      
Land at cost 2,527,000      
Buildings at cost 20,502,000      
Total at cost 23,029,000      
Accumulated Depreciation $ 1,160,000      
Date of Construction 1973      
Date Acquired Jun. 30, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1973 [Member] | Schlangenbad, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,159,000      
Initial costs, buildings 3,770,000      
Additions subsequent to acquisition, Improvements 294,000      
Land at cost 1,453,000      
Buildings at cost 3,770,000      
Total at cost 5,223,000      
Accumulated Depreciation $ 285,000      
Date of Construction 1973      
Date Acquired Jun. 30, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1973 [Member] | Bad Nauheim, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,945,000      
Initial costs, buildings 10,166,000      
Additions subsequent to acquisition, Improvements 60,000      
Land at cost 2,005,000      
Buildings at cost 10,166,000      
Total at cost 12,171,000      
Accumulated Depreciation $ 645,000      
Date of Construction 1973      
Date Acquired Jun. 30, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1973 [Member] | Bad Oeynhausen, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 591,000      
Initial costs, buildings 4,350,000      
Additions subsequent to acquisition, Improvements 40,000      
Land at cost 631,000      
Buildings at cost 4,350,000      
Total at cost 4,981,000      
Accumulated Depreciation $ 10,000      
Date of Construction 1973      
Date Acquired Nov. 30, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1973 [Member] | Ahrweiler, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,262,000      
Initial costs, buildings 8,952,000      
Additions subsequent to acquisition, Improvements 70,000      
Land at cost 1,332,000      
Buildings at cost 8,952,000      
Total at cost 10,284,000      
Accumulated Depreciation $ 133,000      
Date of Construction 1973      
Date Acquired May 27, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1973 [Member] | San Diego, CA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 12,663,000      
Initial costs, buildings 52,432,000      
Land at cost 12,663,000      
Buildings at cost 52,432,000      
Total at cost 65,095,000      
Accumulated Depreciation $ 9,066,000      
Date of Construction 1973      
Date Acquired Feb. 09, 2011      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1973 [Member] | Odessa, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 6,772,000      
Initial costs, buildings 123,215,000      
Land at cost 6,772,000      
Buildings at cost 123,215,000      
Total at cost 129,987,000      
Accumulated Depreciation $ 788,000      
Date of Construction 1973      
Date Acquired Sep. 29, 2017      
Life on which depreciation in latest income statements is computed (Years) 41 years      
1973 [Member] | Port Huron, MI [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 3,029,000      
Initial costs, buildings 14,622,000      
Land at cost 3,029,000      
Buildings at cost 14,622,000      
Total at cost 17,651,000      
Accumulated Depreciation $ 998,000      
Date of Construction 1973      
Date Acquired Dec. 31, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1998 [Member] | Berlin, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, buildings $ 22,952,000      
Additions subsequent to acquisition, Improvements 204,000      
Land at cost 204,000      
Buildings at cost 22,952,000      
Total at cost 23,156,000      
Accumulated Depreciation $ 1,509,000      
Date of Construction 1998      
Date Acquired Jul. 16, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1999 [Member] | Magdeburg, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 15,901,000      
Initial costs, buildings 58,985,000      
Additions subsequent to acquisition, Improvements 276,000      
Land at cost 16,177,000      
Buildings at cost 58,985,000      
Total at cost 75,162,000      
Accumulated Depreciation $ 3,608,000      
Date of Construction 1999      
Date Acquired Jul. 22, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1999 [Member] | Hartsville, SC [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 2,050,000      
Initial costs, buildings 43,970,000      
Land at cost 2,050,000      
Buildings at cost 43,970,000      
Total at cost 46,020,000      
Accumulated Depreciation $ 2,392,000      
Date of Construction 1999      
Date Acquired Aug. 31, 2015      
Life on which depreciation in latest income statements is computed (Years) 34 years      
1970 [Member] | Bad Durrheim, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,537,000      
Initial costs, buildings 12,599,000      
Additions subsequent to acquisition, Improvements 252,000      
Land at cost 1,789,000      
Buildings at cost 12,599,000      
Total at cost 14,388,000      
Accumulated Depreciation $ 802,000      
Date of Construction 1970      
Date Acquired Jul. 24, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1970 [Member] | Rieden, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 611,000      
Initial costs, buildings 4,310,000      
Additions subsequent to acquisition, Improvements 34,000      
Land at cost 645,000      
Buildings at cost 4,310,000      
Total at cost 4,955,000      
Accumulated Depreciation $ 55,000      
Date of Construction 1970      
Date Acquired Jun. 17, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1970 [Member] | Rockledge, FL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 13,919,000      
Initial costs, buildings 23,282,000      
Land at cost 13,919,000      
Buildings at cost 23,282,000      
Total at cost 37,201,000      
Accumulated Depreciation $ 581,000      
Date of Construction 1970      
Date Acquired May 01, 2017      
Life on which depreciation in latest income statements is computed (Years) 42 years      
1972 [Member] | Bad Nauheim, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,945,000      
Initial costs, buildings 10,166,000      
Additions subsequent to acquisition, Improvements 60,000      
Land at cost 2,005,000      
Buildings at cost 10,166,000      
Total at cost 12,171,000      
Accumulated Depreciation $ 645,000      
Date of Construction 1972      
Date Acquired Jun. 30, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1972 [Member] | Fairmont, CA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 1,000,000      
Initial costs, buildings 12,301,000      
Additions subsequent to acquisition, Improvements 5,277,000      
Land at cost 1,277,000      
Buildings at cost 17,301,000      
Total at cost 18,578,000      
Accumulated Depreciation $ 1,343,000      
Date of Construction 1972      
Date Acquired Sep. 19, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1972 [Member] | San Dimas, CA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 6,160,000      
Initial costs, buildings 6,839,000      
Additions subsequent to acquisition, carrying costs 34,000      
Land at cost 6,160,000      
Buildings at cost 6,873,000      
Total at cost 13,033,000      
Accumulated Depreciation $ 1,563,000      
Date of Construction 1972      
Date Acquired Nov. 25, 2008      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1885 [Member] | Heidelberg, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 6,705,000      
Initial costs, buildings 38,743,000      
Additions subsequent to acquisition, Improvements 78,000      
Land at cost 6,783,000      
Buildings at cost 38,743,000      
Total at cost 45,526,000      
Accumulated Depreciation $ 1,461,000      
Date of Construction 1885      
Date Acquired Jun. 22, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1991 [Member] | Heidelberg, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 6,705,000      
Initial costs, buildings 38,743,000      
Additions subsequent to acquisition, Improvements 78,000      
Land at cost 6,783,000      
Buildings at cost 38,743,000      
Total at cost 45,526,000      
Accumulated Depreciation $ 1,461,000      
Date of Construction 1991      
Date Acquired Jun. 22, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1991 [Member] | Redding, CA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Long term acute care hospital      
Initial costs, buildings $ 19,952,000      
Additions subsequent to acquisition, carrying costs 4,360,000      
Land at cost 1,629,000      
Buildings at cost 22,683,000      
Total at cost 24,312,000      
Accumulated Depreciation $ 6,979,000      
Date of Construction 1991      
Date Acquired Jun. 30, 2005      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1987 [Member] | Bad Salzdetfurth, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,122,000      
Initial costs, buildings 7,595,000      
Additions subsequent to acquisition, Improvements 54,000      
Land at cost 1,176,000      
Buildings at cost 7,595,000      
Total at cost 8,771,000      
Accumulated Depreciation $ 210,000      
Date of Construction 1987      
Date Acquired Nov. 23, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1987 [Member] | Salt Lake City, UT [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 17,204,000      
Initial costs, buildings 101,915,000      
Land at cost 17,204,000      
Buildings at cost 101,915,000      
Total at cost 119,119,000      
Accumulated Depreciation $ 635,000      
Date of Construction 1987      
Date Acquired Sep. 29, 2017      
Life on which depreciation in latest income statements is computed (Years) 41 years      
1910 [Member] | Bad Bertrich, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 546,000      
Initial costs, buildings 4,424,000      
Additions subsequent to acquisition, Improvements 72,000      
Land at cost 618,000      
Buildings at cost 4,424,000      
Total at cost 5,042,000      
Accumulated Depreciation $ 125,000      
Date of Construction 1910      
Date Acquired Nov. 30, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1985 [Member] | Bad Bertrich, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 546,000      
Initial costs, buildings 4,424,000      
Additions subsequent to acquisition, Improvements 72,000      
Land at cost 618,000      
Buildings at cost 4,424,000      
Total at cost 5,042,000      
Accumulated Depreciation $ 125,000      
Date of Construction 1985      
Date Acquired Nov. 30, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1985 [Member] | Fairmont, CA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 1,000,000      
Initial costs, buildings 12,301,000      
Additions subsequent to acquisition, Improvements 5,277,000      
Land at cost 1,277,000      
Buildings at cost 17,301,000      
Total at cost 18,578,000      
Accumulated Depreciation $ 1,343,000      
Date of Construction 1985      
Date Acquired Sep. 19, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1985 [Member] | Fort Lauderdale, FL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,499,000      
Initial costs, buildings 21,939,000      
Additions subsequent to acquisition, carrying costs 1,000      
Land at cost 3,499,000      
Buildings at cost 21,940,000      
Total at cost 25,439,000      
Accumulated Depreciation $ 5,313,000      
Date of Construction 1985      
Date Acquired Apr. 22, 2008      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1985 [Member] | Hot Springs, AR [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 7,100,000      
Initial costs, buildings 59,432,000      
Additions subsequent to acquisition, Improvements 19,996,000      
Land at cost 7,100,000      
Buildings at cost 79,428,000      
Total at cost 86,528,000      
Accumulated Depreciation $ 4,626,000      
Date of Construction 1985      
Date Acquired Aug. 31, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2011 [Member] | Lubeck, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,164,000      
Initial costs, buildings 5,235,000      
Additions subsequent to acquisition, Improvements 30,000      
Land at cost 1,194,000      
Buildings at cost 5,235,000      
Total at cost 6,429,000      
Accumulated Depreciation $ 133,000      
Date of Construction 2011      
Date Acquired Dec. 31, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2011 [Member] | Cologne, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 2,576,000      
Initial costs, buildings 18,842,000      
Additions subsequent to acquisition, Improvements 144,000      
Land at cost 2,720,000      
Buildings at cost 18,842,000      
Total at cost 21,562,000      
Accumulated Depreciation $ 240,000      
Date of Construction 2011      
Date Acquired Jun. 23, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2011 [Member] | Methuen, MA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general      
Initial costs, land $ 23,809,000      
Initial costs, buildings 89,505,000      
Additions subsequent to acquisition, Improvements 810,000      
Land at cost 23,809,000      
Buildings at cost 90,315,000      
Total at cost 114,124,000      
Accumulated Depreciation $ 3,191,000      
Date of Construction 2011      
Date Acquired Oct. 03, 2016      
Life on which depreciation in latest income statements is computed (Years) 41 years      
1800 [Member] | Vitense-Parber, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 864,000      
Initial costs, buildings 4,197,000      
Additions subsequent to acquisition, Improvements 84,000      
Land at cost 948,000      
Buildings at cost 4,197,000      
Total at cost 5,145,000      
Accumulated Depreciation $ 111,000      
Date of Construction 1800      
Date Acquired Dec. 31, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1901 [Member] | Breuberg-Sandbach, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 804,000      
Initial costs, buildings 13,872,000      
Additions subsequent to acquisition, Improvements 306,000      
Land at cost 1,110,000      
Buildings at cost 13,872,000      
Total at cost 14,982,000      
Accumulated Depreciation $ 367,000      
Date of Construction 1901      
Date Acquired Dec. 31, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1984 [Member] | Breuberg-Sandbach, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 804,000      
Initial costs, buildings 13,872,000      
Additions subsequent to acquisition, Improvements 306,000      
Land at cost 1,110,000      
Buildings at cost 13,872,000      
Total at cost 14,982,000      
Accumulated Depreciation $ 367,000      
Date of Construction 1984      
Date Acquired Dec. 31, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1984 [Member] | Bennettsville, SC [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 794,000      
Initial costs, buildings 15,772,000      
Land at cost 794,000      
Buildings at cost 15,772,000      
Total at cost 16,566,000      
Accumulated Depreciation $ 3,788,000      
Date of Construction 1984      
Date Acquired Apr. 01, 2008      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1984 [Member] | Hope, AR [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 1,651,000      
Initial costs, buildings 3,359,000      
Land at cost 1,651,000      
Buildings at cost 3,359,000      
Total at cost 5,010,000      
Accumulated Depreciation $ 45,000      
Date of Construction 1984      
Date Acquired Sep. 29, 2017      
Life on which depreciation in latest income statements is computed (Years) 41 years      
1984 [Member] | Olympia, Washington [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 7,220,000      
Initial costs, buildings 89,348,000      
Additions subsequent to acquisition, Improvements 11,775,000      
Land at cost 7,220,000      
Buildings at cost 101,123,000      
Total at cost 108,343,000      
Accumulated Depreciation $ 3,375,000      
Date of Construction 1984      
Date Acquired Jul. 22, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1860 [Member] | Ravensrush, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,062,000      
Initial costs, buildings 2,993,000      
Additions subsequent to acquisition, Improvements 90,000      
Land at cost 1,152,000      
Buildings at cost 2,993,000      
Total at cost 4,145,000      
Accumulated Depreciation $ 81,000      
Date of Construction 1860      
Date Acquired Dec. 31, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1600 [Member] | Wildeck, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 846,000      
Initial costs, buildings 5,961,000      
Additions subsequent to acquisition, Improvements 66,000      
Land at cost 912,000      
Buildings at cost 5,961,000      
Total at cost 6,873,000      
Accumulated Depreciation $ 153,000      
Date of Construction 1600      
Date Acquired Dec. 31, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2013 [Member] | Wildeck, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 846,000      
Initial costs, buildings 5,961,000      
Additions subsequent to acquisition, Improvements 66,000      
Land at cost 912,000      
Buildings at cost 5,961,000      
Total at cost 6,873,000      
Accumulated Depreciation $ 153,000      
Date of Construction 2013      
Date Acquired Dec. 31, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2013 [Member] | Germersheim, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 797,000      
Initial costs, buildings 5,647,000      
Additions subsequent to acquisition, Improvements 44,000      
Land at cost 841,000      
Buildings at cost 5,647,000      
Total at cost 6,488,000      
Accumulated Depreciation $ 84,000      
Date of Construction 2013      
Date Acquired Jun. 08, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2013 [Member] | Hausman, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 1,500,000      
Initial costs, buildings 8,958,000      
Land at cost 1,500,000      
Buildings at cost 8,958,000      
Total at cost 10,458,000      
Accumulated Depreciation $ 1,060,000      
Date of Construction 2013      
Date Acquired Mar. 01, 2013      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2013 [Member] | Lafayette, IN [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 800,000      
Initial costs, buildings 14,968,000      
Additions subsequent to acquisition, Improvements (25,000)      
Land at cost 800,000      
Buildings at cost 14,943,000      
Total at cost 15,743,000      
Accumulated Depreciation $ 1,824,000      
Date of Construction 2013      
Date Acquired Feb. 01, 2013      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2013 [Member] | Little Elm, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 1,241,000      
Initial costs, buildings 3,491,000      
Land at cost 1,241,000      
Buildings at cost 3,491,000      
Total at cost 4,732,000      
Accumulated Depreciation $ 353,000      
Date of Construction 2013      
Date Acquired Dec. 01, 2013      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2013 [Member] | Post Falls, ID [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 417,000      
Initial costs, buildings 12,175,000      
Additions subsequent to acquisition, Improvements 1,905,000      
Land at cost 767,000      
Buildings at cost 13,730,000      
Total at cost 14,497,000      
Accumulated Depreciation $ 1,382,000      
Date of Construction 2013      
Date Acquired Dec. 31, 2013      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2013 [Member] | Spartanburg, SC [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,135,000      
Initial costs, buildings 15,717,000      
Land at cost 1,135,000      
Buildings at cost 15,717,000      
Total at cost 16,852,000      
Accumulated Depreciation $ 1,718,000      
Date of Construction 2013      
Date Acquired Aug. 01, 2013      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1902 [Member] | Romhild, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 107,000      
Initial costs, buildings 9,603,000      
Additions subsequent to acquisition, Improvements 240,000      
Land at cost 347,000      
Buildings at cost 9,603,000      
Total at cost 9,950,000      
Accumulated Depreciation $ 264,000      
Date of Construction 1902      
Date Acquired Dec. 31, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2000 [Member] | Romhild, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 107,000      
Initial costs, buildings 9,603,000      
Additions subsequent to acquisition, Improvements 240,000      
Land at cost 347,000      
Buildings at cost 9,603,000      
Total at cost 9,950,000      
Accumulated Depreciation $ 264,000      
Date of Construction 2000      
Date Acquired Dec. 31, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2000 [Member] | Warren, OH [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 2,417,000      
Initial costs, buildings 15,857,000      
Land at cost 2,417,000      
Buildings at cost 15,857,000      
Total at cost 18,274,000      
Accumulated Depreciation $ 356,000      
Date of Construction 2000      
Date Acquired May 01, 2017      
Life on which depreciation in latest income statements is computed (Years) 46 years      
2000 [Member] | Montclair, NJ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 7,900,000      
Initial costs, buildings 99,632,000      
Additions subsequent to acquisition, Improvements 585,000      
Land at cost 8,477,000      
Buildings at cost 99,640,000      
Total at cost 108,117,000      
Accumulated Depreciation $ 9,682,000      
Date of Construction 2000      
Date Acquired Apr. 01, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2015 [Member] | Bad Durkheim, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,054,000      
Initial costs, buildings 21,727,000      
Additions subsequent to acquisition, Improvements 171,000      
Land at cost 3,225,000      
Buildings at cost 21,727,000      
Total at cost 24,952,000      
Accumulated Depreciation $ 277,000      
Date of Construction 2015      
Date Acquired Jul. 07, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2015 [Member] | Houston, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 1,423,000      
Initial costs, buildings 3,770,000      
Land at cost 1,423,000      
Buildings at cost 3,770,000      
Total at cost 5,193,000      
Accumulated Depreciation $ 267,000      
Date of Construction 2015      
Date Acquired Feb. 18, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2015 [Member] | Aurora, CO [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, buildings $ 4,812,000      
Buildings at cost 4,812,000      
Total at cost 4,812,000      
Accumulated Depreciation $ 271,000      
Date of Construction 2015      
Date Acquired Sep. 17, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2015 [Member] | Ft. Worth, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, buildings $ 4,392,000      
Buildings at cost 4,392,000      
Total at cost 4,392,000      
Accumulated Depreciation $ 302,000      
Date of Construction 2015      
Date Acquired Mar. 27, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2015 [Member] | Glendale, AZ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, buildings $ 4,046,000      
Buildings at cost 4,046,000      
Total at cost 4,046,000      
Accumulated Depreciation $ 261,000      
Date of Construction 2015      
Date Acquired Jun. 05, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2015 [Member] | Carrollton, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 729,000      
Initial costs, buildings 34,342,000      
Land at cost 729,000      
Buildings at cost 34,342,000      
Total at cost 35,071,000      
Accumulated Depreciation $ 2,075,000      
Date of Construction 2015      
Date Acquired Jul. 17, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2015 [Member] | Chandler, AZ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, buildings $ 4,783,000      
Buildings at cost 4,783,000      
Total at cost 4,783,000      
Accumulated Depreciation $ 319,000      
Date of Construction 2015      
Date Acquired Apr. 24, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2015 [Member] | Katy, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, buildings $ 3,873,000      
Buildings at cost 3,873,000      
Total at cost 3,873,000      
Accumulated Depreciation $ 210,000      
Date of Construction 2015      
Date Acquired Oct. 21, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2015 [Member] | Conroe, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 1,338,000      
Initial costs, buildings 3,712,000      
Land at cost 1,338,000      
Buildings at cost 3,712,000      
Total at cost 5,050,000      
Accumulated Depreciation $ 224,000      
Date of Construction 2015      
Date Acquired Jul. 29, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2015 [Member] | Converse, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 750,000      
Initial costs, buildings 4,423,000      
Land at cost 750,000      
Buildings at cost 4,423,000      
Total at cost 5,173,000      
Accumulated Depreciation $ 304,000      
Date of Construction 2015      
Date Acquired Apr. 10, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2015 [Member] | Denver, CO [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, buildings $ 4,276,000      
Buildings at cost 4,276,000      
Total at cost 4,276,000      
Accumulated Depreciation $ 276,000      
Date of Construction 2015      
Date Acquired Jun. 08, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2015 [Member] | Frisco, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 2,441,000      
Initial costs, buildings 4,474,000      
Land at cost 2,441,000      
Buildings at cost 4,474,000      
Total at cost 6,915,000      
Accumulated Depreciation $ 242,000      
Date of Construction 2015      
Date Acquired Nov. 13, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2015 [Member] | Gilbert, AZ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 1,518,000      
Initial costs, buildings 4,660,000      
Land at cost 1,518,000      
Buildings at cost 4,660,000      
Total at cost 6,178,000      
Accumulated Depreciation $ 282,000      
Date of Construction 2015      
Date Acquired Jul. 22, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2015 [Member] | Highland Village, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, buildings $ 4,016,000      
Buildings at cost 4,016,000      
Total at cost 4,016,000      
Accumulated Depreciation $ 226,000      
Date of Construction 2015      
Date Acquired Sep. 22, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2015 [Member] | Hoover, AL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, buildings $ 7,581,000      
Buildings at cost 7,581,000      
Total at cost 7,581,000      
Accumulated Depreciation $ 590,000      
Date of Construction 2015      
Date Acquired May 01, 2015      
Life on which depreciation in latest income statements is computed (Years) 34 years      
2015 [Member] | Lehi, UT [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 13,403,000      
Initial costs, buildings 29,950,000      
Land at cost 13,403,000      
Buildings at cost 29,950,000      
Total at cost 43,353,000      
Accumulated Depreciation $ 221,000      
Date of Construction 2015      
Date Acquired Sep. 29, 2017      
Life on which depreciation in latest income statements is computed (Years) 45 years      
2015 [Member] | McKinney, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, buildings $ 4,060,000      
Buildings at cost 4,060,000      
Total at cost 4,060,000      
Accumulated Depreciation $ 330,000      
Date of Construction 2015      
Date Acquired Jul. 31, 2015      
Life on which depreciation in latest income statements is computed (Years) 30 years      
2015 [Member] | Parker, CO [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 1,301,000      
Initial costs, buildings 4,448,000      
Land at cost 1,301,000      
Buildings at cost 4,448,000      
Total at cost 5,749,000      
Accumulated Depreciation $ 241,000      
Date of Construction 2015      
Date Acquired Nov. 06, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2015 [Member] | Taunton, MA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 4,428,000      
Initial costs, buildings 73,433,000      
Land at cost 4,428,000      
Buildings at cost 73,433,000      
Total at cost 77,861,000      
Accumulated Depreciation $ 2,441,000      
Date of Construction 2015      
Date Acquired Oct. 03, 2016      
Life on which depreciation in latest income statements is computed (Years) 41 years      
2015 [Member] | League City, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, buildings $ 3,901,000      
Buildings at cost 3,901,000      
Total at cost 3,901,000      
Accumulated Depreciation $ 244,000      
Date of Construction 2015      
Date Acquired Jun. 19, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2010 [Member] | Bad Oeynhausen, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 591,000      
Initial costs, buildings 4,350,000      
Additions subsequent to acquisition, Improvements 40,000      
Land at cost 631,000      
Buildings at cost 4,350,000      
Total at cost 4,981,000      
Accumulated Depreciation $ 10,000      
Date of Construction 2010      
Date Acquired Nov. 30, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2010 [Member] | Bad Pyrmont, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,055,000      
Initial costs, buildings 21,790,000      
Additions subsequent to acquisition, Improvements 170,000      
Land at cost 3,225,000      
Buildings at cost 21,790,000      
Total at cost 25,015,000      
Accumulated Depreciation $ 324,000      
Date of Construction 2010      
Date Acquired Jun. 01, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2010 [Member] | Brockton, MA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 18,328,000      
Initial costs, buildings 67,248,000      
Additions subsequent to acquisition, Improvements 1,516,000      
Land at cost 18,328,000      
Buildings at cost 68,764,000      
Total at cost 87,092,000      
Accumulated Depreciation $ 2,656,000      
Date of Construction 2010      
Date Acquired Oct. 03, 2016      
Life on which depreciation in latest income statements is computed (Years) 41 years      
2010 [Member] | Sherman, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 4,491,000      
Initial costs, buildings 24,802,000      
Land at cost 4,491,000      
Buildings at cost 24,802,000      
Total at cost 29,293,000      
Accumulated Depreciation $ 2,061,000      
Date of Construction 2010      
Date Acquired Oct. 31, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1989 [Member] | Bad Salzuflen, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 4,240,000      
Initial costs, buildings 31,794,000      
Additions subsequent to acquisition, Improvements 282,000      
Land at cost 4,522,000      
Buildings at cost 31,794,000      
Total at cost 36,316,000      
Accumulated Depreciation $ 69,000      
Date of Construction 1989      
Date Acquired Nov. 30, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2016 [Member] | Bad Salzuflen, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 4,240,000      
Initial costs, buildings 31,794,000      
Additions subsequent to acquisition, Improvements 282,000      
Land at cost 4,522,000      
Buildings at cost 31,794,000      
Total at cost 36,316,000      
Accumulated Depreciation $ 69,000      
Date of Construction 2016      
Date Acquired Nov. 30, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2016 [Member] | Houston, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 4,047,000      
Initial costs, buildings 36,864,000      
Land at cost 4,047,000      
Buildings at cost 36,864,000      
Total at cost 40,911,000      
Accumulated Depreciation $ 1,383,000      
Date of Construction 2016      
Date Acquired Jul. 07, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2016 [Member] | Glendale, AZ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 1,144,000      
Initial costs, buildings 6,087,000      
Land at cost 1,144,000      
Buildings at cost 6,087,000      
Total at cost 7,231,000      
Accumulated Depreciation $ 178,000      
Date of Construction 2016      
Date Acquired Oct. 21, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2016 [Member] | New Orleans, LA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 2,850,000      
Initial costs, buildings 6,125,000      
Land at cost 2,850,000      
Buildings at cost 6,125,000      
Total at cost 8,975,000      
Accumulated Depreciation $ 191,000      
Date of Construction 2016      
Date Acquired Sep. 23, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2016 [Member] | The Woodlands, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, buildings $ 4,524,000      
Buildings at cost 4,524,000      
Total at cost 4,524,000      
Accumulated Depreciation $ 198,000      
Date of Construction 2016      
Date Acquired Mar. 28, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2016 [Member] | DeSoto, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 750,000      
Initial costs, buildings 4,234,000      
Land at cost 750,000      
Buildings at cost 4,234,000      
Total at cost 4,984,000      
Accumulated Depreciation $ 168,000      
Date of Construction 2016      
Date Acquired May 23, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2016 [Member] | San Antonio, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, buildings $ 4,801,000      
Buildings at cost 4,801,000      
Total at cost 4,801,000      
Accumulated Depreciation $ 130,000      
Date of Construction 2016      
Date Acquired Dec. 09, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2016 [Member] | Frisco, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, buildings $ 4,738,000      
Buildings at cost 4,738,000      
Total at cost 4,738,000      
Accumulated Depreciation $ 217,000      
Date of Construction 2016      
Date Acquired Mar. 04, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2016 [Member] | Garland, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, buildings $ 4,647,000      
Buildings at cost 4,647,000      
Total at cost 4,647,000      
Accumulated Depreciation $ 136,000      
Date of Construction 2016      
Date Acquired Nov. 15, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2016 [Member] | Goodyear, AZ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 1,800,000      
Initial costs, buildings 4,713,000      
Land at cost 1,800,000      
Buildings at cost 4,713,000      
Total at cost 6,513,000      
Accumulated Depreciation $ 206,000      
Date of Construction 2016      
Date Acquired Apr. 04, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2016 [Member] | Helotes, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 1,900,000      
Initial costs, buildings 5,115,000      
Land at cost 1,900,000      
Buildings at cost 5,115,000      
Total at cost 7,015,000      
Accumulated Depreciation $ 234,000      
Date of Construction 2016      
Date Acquired Mar. 10, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2016 [Member] | Highlands Ranch, CO [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 4,200,000      
Initial costs, buildings 4,778,000      
Land at cost 4,200,000      
Buildings at cost 4,778,000      
Total at cost 8,978,000      
Accumulated Depreciation $ 169,000      
Date of Construction 2016      
Date Acquired Jul. 25, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2016 [Member] | Katy, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, buildings $ 4,183,000      
Buildings at cost 4,183,000      
Total at cost 4,183,000      
Accumulated Depreciation $ 131,000      
Date of Construction 2016      
Date Acquired Oct. 10, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2016 [Member] | Longmont, CO [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, buildings $ 4,181,000      
Buildings at cost 4,181,000      
Total at cost 4,181,000      
Accumulated Depreciation $ 200,000      
Date of Construction 2016      
Date Acquired Feb. 10, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2016 [Member] | Mandeville, LA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 2,800,000      
Initial costs, buildings 5,370,000      
Land at cost 2,800,000      
Buildings at cost 5,370,000      
Total at cost 8,170,000      
Accumulated Depreciation $ 157,000      
Date of Construction 2016      
Date Acquired Oct. 28, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2016 [Member] | Marrero, LA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, buildings $ 5,801,000      
Buildings at cost 5,801,000      
Total at cost 5,801,000      
Accumulated Depreciation $ 218,000      
Date of Construction 2016      
Date Acquired Jul. 15, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2016 [Member] | San Antonio, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, buildings $ 4,253,000      
Buildings at cost 4,253,000      
Total at cost 4,253,000      
Accumulated Depreciation $ 124,000      
Date of Construction 2016      
Date Acquired Oct. 27, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2016 [Member] | Plano, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, buildings $ 4,842,000      
Buildings at cost 4,842,000      
Total at cost 4,842,000      
Accumulated Depreciation $ 151,000      
Date of Construction 2016      
Date Acquired Sep. 30, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2016 [Member] | Rosenberg, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, buildings $ 4,505,000      
Buildings at cost 4,505,000      
Total at cost 4,505,000      
Accumulated Depreciation $ 225,000      
Date of Construction 2016      
Date Acquired Jan. 15, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2016 [Member] | Columbus, Oh [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 1,726,000      
Land at cost 1,726,000      
Total at cost $ 1,726,000      
Date of Construction 2016      
Date Acquired Aug. 30, 2016      
2016 [Member] | Toledo, OH [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, buildings $ 17,740,000      
Buildings at cost 17,740,000      
Total at cost 17,740,000      
Accumulated Depreciation $ 773,000      
Date of Construction 2016      
Date Acquired Apr. 01, 2016      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2016 One [Member] | Bad Salzuflen, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 5,601,000      
Initial costs, buildings 41,854,000      
Additions subsequent to acquisition, Improvements 372,000      
Land at cost 5,973,000      
Buildings at cost 41,854,000      
Total at cost 47,827,000      
Accumulated Depreciation $ 90,000      
Date of Construction 2016      
Date Acquired Nov. 30, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1911 [Member] | Schalkenmehren, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 199,000      
Initial costs, buildings 1,354,000      
Additions subsequent to acquisition, Improvements 11,000      
Land at cost 210,000      
Buildings at cost 1,354,000      
Total at cost 1,564,000      
Accumulated Depreciation $ 20,000      
Date of Construction 1911      
Date Acquired Jun. 15, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2012 [Member] | Schalkenmehren, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 199,000      
Initial costs, buildings 1,354,000      
Additions subsequent to acquisition, Improvements 11,000      
Land at cost 210,000      
Buildings at cost 1,354,000      
Total at cost 1,564,000      
Accumulated Depreciation $ 20,000      
Date of Construction 2012      
Date Acquired Jun. 15, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2012 [Member] | Oppenweiler, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 2,152,000      
Initial costs, buildings 15,349,000      
Additions subsequent to acquisition, Improvements 121,000      
Land at cost 2,273,000      
Buildings at cost 15,349,000      
Total at cost 17,622,000      
Accumulated Depreciation $ 163,000      
Date of Construction 2012      
Date Acquired Jul. 28, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2012 [Member] | San Antonio, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 2,248,000      
Initial costs, buildings 5,880,000      
Land at cost 2,248,000      
Buildings at cost 5,880,000      
Total at cost 8,128,000      
Accumulated Depreciation $ 757,000      
Date of Construction 2012      
Date Acquired Oct. 02, 2012      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2012 [Member] | Fall River, MA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 2,406,000      
Initial costs, buildings 82,358,000      
Additions subsequent to acquisition, Improvements 15,555,000      
Land at cost 2,406,000      
Buildings at cost 97,913,000      
Total at cost 100,319,000      
Accumulated Depreciation $ 2,632,000      
Date of Construction 2012      
Date Acquired Oct. 03, 2016      
Life on which depreciation in latest income statements is computed (Years) 41 years      
2012 [Member] | Florence, AZ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 900,000      
Initial costs, buildings 28,462,000      
Additions subsequent to acquisition, Improvements 105,000      
Land at cost 900,000      
Buildings at cost 28,567,000      
Total at cost 29,467,000      
Accumulated Depreciation $ 4,103,000      
Date of Construction 2012      
Date Acquired Feb. 07, 2012      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2012 [Member] | Overlook, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 2,452,000      
Initial costs, buildings 9,666,000      
Additions subsequent to acquisition, Improvements 7,000      
Land at cost 2,452,000      
Buildings at cost 9,673,000      
Total at cost 12,125,000      
Accumulated Depreciation $ 1,168,000      
Date of Construction 2012      
Date Acquired Feb. 01, 2013      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1940 [Member] | Darscheid, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,753,000      
Initial costs, buildings 12,503,000      
Additions subsequent to acquisition, Improvements 98,000      
Land at cost 1,851,000      
Buildings at cost 12,503,000      
Total at cost 14,354,000      
Accumulated Depreciation $ 186,000      
Date of Construction 1940      
Date Acquired Jun. 15, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1940 [Member] | Houston, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 33,627,000      
Initial costs, buildings 97,745,000      
Land at cost 33,627,000      
Buildings at cost 97,745,000      
Total at cost 131,372,000      
Accumulated Depreciation $ 494,000      
Date of Construction 1940      
Date Acquired Sep. 29, 2017      
Life on which depreciation in latest income statements is computed (Years) 41 years      
1940 [Member] | Taunton, MA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 4,428,000      
Initial costs, buildings 73,433,000      
Land at cost 4,428,000      
Buildings at cost 73,433,000      
Total at cost 77,861,000      
Accumulated Depreciation $ 2,441,000      
Date of Construction 1940      
Date Acquired Oct. 03, 2016      
Life on which depreciation in latest income statements is computed (Years) 41 years      
1940 [Member] | Tempe, AZ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 6,050,000      
Initial costs, buildings 10,986,000      
Land at cost 6,050,000      
Buildings at cost 10,986,000      
Total at cost 17,036,000      
Accumulated Depreciation $ 95,000      
Date of Construction 1940      
Date Acquired Sep. 29, 2017      
Life on which depreciation in latest income statements is computed (Years) 41 years      
2004 [Member] | Darscheid, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,753,000      
Initial costs, buildings 12,503,000      
Additions subsequent to acquisition, Improvements 98,000      
Land at cost 1,851,000      
Buildings at cost 12,503,000      
Total at cost 14,354,000      
Accumulated Depreciation $ 186,000      
Date of Construction 2004      
Date Acquired Jun. 15, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2004 [Member] | Lubstorf, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,094,000      
Initial costs, buildings 22,053,000      
Additions subsequent to acquisition, Improvements 173,000      
Land at cost 3,267,000      
Buildings at cost 22,053,000      
Total at cost 25,320,000      
Accumulated Depreciation $ 328,000      
Date of Construction 2004      
Date Acquired Jun. 01, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2004 [Member] | Webster, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Long term acute care hospital      
Initial costs, land $ 663,000      
Initial costs, buildings 33,751,000      
Land at cost 663,000      
Buildings at cost 33,751,000      
Total at cost 34,414,000      
Accumulated Depreciation $ 5,906,000      
Date of Construction 2004      
Date Acquired Dec. 21, 2010      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2004 [Member] | Camden, SC [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, buildings $ 22,739,000      
Buildings at cost 22,739,000      
Total at cost 22,739,000      
Accumulated Depreciation $ 972,000      
Date of Construction 2004      
Date Acquired Oct. 30, 2015      
Life on which depreciation in latest income statements is computed (Years) 39 years      
2004 [Member] | Odessa, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 6,772,000      
Initial costs, buildings 123,215,000      
Land at cost 6,772,000      
Buildings at cost 123,215,000      
Total at cost 129,987,000      
Accumulated Depreciation $ 788,000      
Date of Construction 2004      
Date Acquired Sep. 29, 2017      
Life on which depreciation in latest income statements is computed (Years) 41 years      
1964 [Member] | Germersheim, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 797,000      
Initial costs, buildings 5,647,000      
Additions subsequent to acquisition, Improvements 44,000      
Land at cost 841,000      
Buildings at cost 5,647,000      
Total at cost 6,488,000      
Accumulated Depreciation $ 84,000      
Date of Construction 1964      
Date Acquired Jun. 08, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1964 [Member] | Ahrweiler, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,262,000      
Initial costs, buildings 8,952,000      
Additions subsequent to acquisition, Improvements 70,000      
Land at cost 1,332,000      
Buildings at cost 8,952,000      
Total at cost 10,284,000      
Accumulated Depreciation $ 133,000      
Date of Construction 1964      
Date Acquired May 27, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1964 [Member] | San Diego, CA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 6,550,000      
Initial costs, buildings 15,653,000      
Additions subsequent to acquisition, carrying costs 77,000      
Land at cost 6,550,000      
Buildings at cost 15,730,000      
Total at cost 22,280,000      
Accumulated Depreciation $ 4,193,000      
Date of Construction 1964      
Date Acquired May 09, 2007      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1964 [Member] | Portland, OR [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Long term acute care hospital      
Initial costs, land $ 3,085,000      
Initial costs, buildings 17,859,000      
Additions subsequent to acquisition, carrying costs 2,559,000      
Land at cost 3,071,000      
Buildings at cost 20,432,000      
Total at cost 23,503,000      
Accumulated Depreciation $ 5,410,000      
Date of Construction 1964      
Date Acquired Apr. 18, 2007      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1964 [Member] | Anaheim, CA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 1,875,000      
Initial costs, buildings 21,814,000      
Additions subsequent to acquisition, carrying costs 10,000      
Land at cost 1,875,000      
Buildings at cost 21,824,000      
Total at cost 23,699,000      
Accumulated Depreciation $ 6,092,000      
Date of Construction 1964      
Date Acquired Nov. 08, 2006      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1967 [Member] | Kevelaer, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,089,000      
Initial costs, buildings 7,746,000      
Additions subsequent to acquisition, Improvements 61,000      
Land at cost 1,150,000      
Buildings at cost 7,746,000      
Total at cost 8,896,000      
Accumulated Depreciation $ 115,000      
Date of Construction 1967      
Date Acquired Jun. 10, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
Unknown Date [Member] | Willich, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 425,000      
Initial costs, buildings 2,979,000      
Additions subsequent to acquisition, Improvements 24,000      
Land at cost 449,000      
Buildings at cost 2,979,000      
Total at cost 3,428,000      
Accumulated Depreciation $ 44,000      
Date Acquired May 31, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1910 One [Member] | Bad Bertrich, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,357,000      
Initial costs, buildings 7,746,000      
Additions subsequent to acquisition, Improvements 24,000      
Land at cost 1,381,000      
Buildings at cost 7,746,000      
Total at cost 9,127,000      
Accumulated Depreciation $ 179,000      
Date of Construction 1910      
Date Acquired Jan. 31, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2001 [Member] | Neunkirchen, Germany [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 3,108,000      
Initial costs, buildings 22,198,000      
Additions subsequent to acquisition, Improvements 173,000      
Land at cost 3,281,000      
Buildings at cost 22,198,000      
Total at cost 25,479,000      
Accumulated Depreciation $ 378,000      
Date of Construction 2001      
Date Acquired May 13, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2001 [Member] | Hope, AR [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 1,651,000      
Initial costs, buildings 3,359,000      
Land at cost 1,651,000      
Buildings at cost 3,359,000      
Total at cost 5,010,000      
Accumulated Depreciation $ 45,000      
Date of Construction 2001      
Date Acquired Sep. 29, 2017      
Life on which depreciation in latest income statements is computed (Years) 41 years      
1918 [Member] | Bayonne, NJ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 2,003,000      
Initial costs, buildings 51,495,000      
Land at cost 2,003,000      
Buildings at cost 51,495,000      
Total at cost 53,498,000      
Accumulated Depreciation $ 17,809,000      
Date of Construction 1918      
Date Acquired Feb. 04, 2011      
Life on which depreciation in latest income statements is computed (Years) 20 years      
1917 [Member] | Brighton, MA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 18,540,000      
Initial costs, buildings 146,490,000      
Additions subsequent to acquisition, Improvements 836,000      
Land at cost 18,540,000      
Buildings at cost 147,326,000      
Total at cost 165,866,000      
Accumulated Depreciation $ 4,584,000      
Date of Construction 1917      
Date Acquired Oct. 03, 2016      
Life on which depreciation in latest income statements is computed (Years) 41 years      
1965 [Member] | Brockton, MA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 18,328,000      
Initial costs, buildings 67,248,000      
Additions subsequent to acquisition, Improvements 1,516,000      
Land at cost 18,328,000      
Buildings at cost 68,764,000      
Total at cost 87,092,000      
Accumulated Depreciation $ 2,656,000      
Date of Construction 1965      
Date Acquired Oct. 03, 2016      
Life on which depreciation in latest income statements is computed (Years) 41 years      
2015 One [Member] | Chandler, AZ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Type of property Freestanding ER      
Initial costs, land $ 750,000      
Initial costs, buildings 3,852,000      
Land at cost 750,000      
Buildings at cost 3,852,000      
Total at cost 4,602,000      
Accumulated Depreciation $ 217,000      
Date of Construction 2015      
Date Acquired Oct. 07, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2015 One [Member] | Hoover, AL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Medical Office Building      
Initial costs, buildings $ 1,034,000      
Buildings at cost 1,034,000      
Total at cost 1,034,000      
Accumulated Depreciation $ 80,000      
Date of Construction 2015      
Date Acquired May 01, 2015      
Life on which depreciation in latest income statements is computed (Years) 34 years      
2017 [Member] | Houston, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, buildings $ 4,365,000      
Buildings at cost 4,365,000      
Total at cost 4,365,000      
Accumulated Depreciation $ 83,000      
Date of Construction 2017      
Date Acquired May 08, 2017      
Life on which depreciation in latest income statements is computed (Years) 35 years      
2017 [Member] | Phoenix, AZ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 5,576,000      
Initial costs, buildings 45,774,000      
Land at cost 5,576,000      
Buildings at cost 45,774,000      
Total at cost 51,350,000      
Accumulated Depreciation $ 1,049,000      
Date of Construction 2017      
Date Acquired Feb. 10, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2017 [Member] | Austin, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, buildings $ 4,979,000      
Buildings at cost 4,979,000      
Total at cost 4,979,000      
Accumulated Depreciation $ 104,000      
Date of Construction 2017      
Date Acquired Mar. 02, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2017 [Member] | Texarkana, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 12,402,000      
Land at cost 12,402,000      
Total at cost $ 12,402,000      
Date of Construction 2017      
Date Acquired Sep. 29, 2017      
2006 [Member] | Houston, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 4,757,000      
Initial costs, buildings 56,238,000      
Additions subsequent to acquisition, Improvements (37,000)      
Additions subsequent to acquisition, carrying costs 1,259,000      
Land at cost 5,427,000      
Buildings at cost 56,790,000      
Total at cost 62,217,000      
Accumulated Depreciation $ 15,691,000      
Date of Construction 2006      
Date Acquired Dec. 01, 2006      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2006 [Member] | Dallas, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Long term acute care hospital      
Initial costs, land $ 1,000,000      
Initial costs, buildings 13,589,000      
Additions subsequent to acquisition, carrying costs 368,000      
Land at cost 1,421,000      
Buildings at cost 13,536,000      
Total at cost 14,957,000      
Accumulated Depreciation $ 3,835,000      
Date of Construction 2006      
Date Acquired Sep. 05, 2006      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2006 [Member] | Bloomington, IN [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 2,392,000      
Initial costs, buildings 28,212,000      
Additions subsequent to acquisition, Improvements 5,000,000      
Additions subsequent to acquisition, carrying costs 408,000      
Land at cost 2,392,000      
Buildings at cost 33,620,000      
Total at cost 36,012,000      
Accumulated Depreciation $ 9,430,000      
Date of Construction 2006      
Date Acquired Aug. 08, 2006      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2006 [Member] | Petersburg, VA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 1,302,000      
Initial costs, buildings 9,121,000      
Land at cost 1,302,000      
Buildings at cost 9,121,000      
Total at cost 10,423,000      
Accumulated Depreciation $ 2,166,000      
Date of Construction 2006      
Date Acquired Jul. 01, 2008      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2005 [Member] | Easton, PA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 13,898,000      
Initial costs, buildings 40,245,000      
Land at cost 13,898,000      
Buildings at cost 40,245,000      
Total at cost 54,143,000      
Accumulated Depreciation $ 710,000      
Date of Construction 2005      
Date Acquired May 01, 2017      
Life on which depreciation in latest income statements is computed (Years) 41 years      
2005 [Member] | Gilbert, AZ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 150,000      
Initial costs, buildings 15,553,000      
Land at cost 150,000      
Buildings at cost 15,553,000      
Total at cost 15,703,000      
Accumulated Depreciation $ 2,722,000      
Date of Construction 2005      
Date Acquired Jan. 04, 2011      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2005 [Member] | Port Arthur, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 10,593,000      
Initial costs, buildings 76,398,000      
Additions subsequent to acquisition, Improvements 1,062,000      
Land at cost 11,655,000      
Buildings at cost 76,398,000      
Total at cost 88,053,000      
Accumulated Depreciation $ 7,976,000      
Date of Construction 2005      
Date Acquired Sep. 26, 2013      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2005 [Member] | Tomball, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Long term acute care hospital      
Initial costs, land $ 1,299,000      
Initial costs, buildings 23,982,000      
Land at cost 1,299,000      
Buildings at cost 23,982,000      
Total at cost 25,281,000      
Accumulated Depreciation $ 4,197,000      
Date of Construction 2005      
Date Acquired Dec. 21, 2010      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1939 [Member] | Fairmont, CA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 1,000,000      
Initial costs, buildings 12,301,000      
Additions subsequent to acquisition, Improvements 5,277,000      
Land at cost 1,277,000      
Buildings at cost 17,301,000      
Total at cost 18,578,000      
Accumulated Depreciation $ 1,343,000      
Date of Construction 1939      
Date Acquired Sep. 19, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1950 [Member] | Houston, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 33,627,000      
Initial costs, buildings 97,745,000      
Land at cost 33,627,000      
Buildings at cost 97,745,000      
Total at cost 131,372,000      
Accumulated Depreciation $ 494,000      
Date of Construction 1950      
Date Acquired Sep. 29, 2017      
Life on which depreciation in latest income statements is computed (Years) 41 years      
1950 [Member] | Fall River, MA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 2,406,000      
Initial costs, buildings 82,358,000      
Additions subsequent to acquisition, Improvements 15,555,000      
Land at cost 2,406,000      
Buildings at cost 97,913,000      
Total at cost 100,319,000      
Accumulated Depreciation $ 2,632,000      
Date of Construction 1950      
Date Acquired Oct. 03, 2016      
Life on which depreciation in latest income statements is computed (Years) 41 years      
1950 [Member] | Methuen, MA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general      
Initial costs, land $ 23,809,000      
Initial costs, buildings 89,505,000      
Additions subsequent to acquisition, Improvements 810,000      
Land at cost 23,809,000      
Buildings at cost 90,315,000      
Total at cost 114,124,000      
Accumulated Depreciation $ 3,191,000      
Date of Construction 1950      
Date Acquired Oct. 03, 2016      
Life on which depreciation in latest income statements is computed (Years) 41 years      
1950 [Member] | Rockledge, FL [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 13,919,000      
Initial costs, buildings 23,282,000      
Land at cost 13,919,000      
Buildings at cost 23,282,000      
Total at cost 37,201,000      
Accumulated Depreciation $ 581,000      
Date of Construction 1950      
Date Acquired May 01, 2017      
Life on which depreciation in latest income statements is computed (Years) 42 years      
1950 [Member] | Sharon, PA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 6,179,000      
Initial costs, buildings 9,066,000      
Land at cost 6,179,000      
Buildings at cost 9,066,000      
Total at cost 15,245,000      
Accumulated Depreciation $ 435,000      
Date of Construction 1950      
Date Acquired May 01, 2017      
Life on which depreciation in latest income statements is computed (Years) 41 years      
1982 [Member] | Garden Grove, CA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Medical Office Building      
Initial costs, land $ 862,000      
Initial costs, buildings 7,888,000      
Additions subsequent to acquisition, carrying costs 28,000      
Land at cost 862,000      
Buildings at cost 7,916,000      
Total at cost 8,778,000      
Accumulated Depreciation $ 1,801,000      
Date of Construction 1982      
Date Acquired Nov. 25, 2008      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1922 [Member] | Warren, OH [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Rehabilitation hospital      
Initial costs, land $ 2,417,000      
Initial costs, buildings 15,857,000      
Land at cost 2,417,000      
Buildings at cost 15,857,000      
Total at cost 18,274,000      
Accumulated Depreciation $ 356,000      
Date of Construction 1922      
Date Acquired May 01, 2017      
Life on which depreciation in latest income statements is computed (Years) 46 years      
1922 [Member] | Lewiston, ID [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 10,577,000      
Initial costs, buildings 70,247,000      
Land at cost 10,577,000      
Buildings at cost 70,247,000      
Total at cost 80,824,000      
Accumulated Depreciation $ 1,585,000      
Date of Construction 1922      
Date Acquired May 01, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1863 [Member] | Hoboken, NJ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 1,387,000      
Initial costs, buildings 44,351,000      
Land at cost 1,387,000      
Buildings at cost 44,351,000      
Total at cost 45,738,000      
Accumulated Depreciation $ 13,616,000      
Date of Construction 1863      
Date Acquired Nov. 04, 2011      
Life on which depreciation in latest income statements is computed (Years) 20 years      
2007 [Member] | Northland, MO [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Long term acute care hospital      
Initial costs, land $ 834,000      
Initial costs, buildings 17,182,000      
Land at cost 834,000      
Buildings at cost 17,182,000      
Total at cost 18,016,000      
Accumulated Depreciation $ 2,971,000      
Date of Construction 2007      
Date Acquired Feb. 14, 2011      
Life on which depreciation in latest income statements is computed (Years) 40 years      
2007 [Member] | Mesa, AZ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 6,264,000      
Initial costs, buildings 99,175,000      
Additions subsequent to acquisition, Improvements 2,242,000      
Land at cost 8,506,000      
Buildings at cost 99,175,000      
Total at cost 107,681,000      
Accumulated Depreciation $ 11,183,000      
Date of Construction 2007      
Date Acquired Sep. 26, 2013      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1978 [Member] | Kansas City, MO [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 10,497,000      
Initial costs, buildings 64,419,000      
Land at cost 10,497,000      
Buildings at cost 64,419,000      
Total at cost 74,916,000      
Accumulated Depreciation $ 4,788,000      
Date of Construction 1978      
Date Acquired Feb. 13, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1978 [Member] | San Antonio, TX [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 8,053,000      
Initial costs, buildings 29,333,000      
Land at cost 8,053,000      
Buildings at cost 29,333,000      
Total at cost 37,386,000      
Accumulated Depreciation $ 204,000      
Date of Construction 1978      
Date Acquired Sep. 29, 2017      
Life on which depreciation in latest income statements is computed (Years) 41 years      
1920 [Member] | Montclair, NJ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 7,900,000      
Initial costs, buildings 99,632,000      
Additions subsequent to acquisition, Improvements 585,000      
Land at cost 8,477,000      
Buildings at cost 99,640,000      
Total at cost 108,117,000      
Accumulated Depreciation $ 9,682,000      
Date of Construction 1920      
Date Acquired Apr. 01, 2014      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1979 [Member] | Phoenix, AZ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 2,396,000      
Initial costs, buildings 26,521,000      
Land at cost 2,396,000      
Buildings at cost 26,521,000      
Total at cost 28,917,000      
Accumulated Depreciation $ 160,000      
Date of Construction 1979      
Date Acquired Sep. 29, 2017      
Life on which depreciation in latest income statements is computed (Years) 42 years      
1979 [Member] | San Dimas, CA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Medical Office Building      
Initial costs, land $ 1,915,000      
Initial costs, buildings 5,085,000      
Additions subsequent to acquisition, carrying costs 18,000      
Land at cost 1,915,000      
Buildings at cost 5,103,000      
Total at cost 7,018,000      
Accumulated Depreciation $ 1,161,000      
Date of Construction 1979      
Date Acquired Nov. 25, 2008      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1968 [Member] | Phoenix, AZ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 13,852,000      
Initial costs, buildings 73,773,000      
Land at cost 13,852,000      
Buildings at cost 73,773,000      
Total at cost 87,625,000      
Accumulated Depreciation $ 500,000      
Date of Construction 1968      
Date Acquired Sep. 29, 2017      
Life on which depreciation in latest income statements is computed (Years) 43 years      
1976 [Member] | Phoenix, AZ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 13,852,000      
Initial costs, buildings 73,773,000      
Land at cost 13,852,000      
Buildings at cost 73,773,000      
Total at cost 87,625,000      
Accumulated Depreciation $ 500,000      
Date of Construction 1976      
Date Acquired Sep. 29, 2017      
Life on which depreciation in latest income statements is computed (Years) 43 years      
1953 [Member] | Port Huron, MI [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 3,029,000      
Initial costs, buildings 14,622,000      
Land at cost 3,029,000      
Buildings at cost 14,622,000      
Total at cost 17,651,000      
Accumulated Depreciation $ 998,000      
Date of Construction 1953      
Date Acquired Dec. 31, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1983 [Member] | Port Huron, MI [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 3,029,000      
Initial costs, buildings 14,622,000      
Land at cost 3,029,000      
Buildings at cost 14,622,000      
Total at cost 17,651,000      
Accumulated Depreciation $ 998,000      
Date of Construction 1983      
Date Acquired Dec. 31, 2015      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1906 [Member] | Salt Lake City, UT [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 17,204,000      
Initial costs, buildings 101,915,000      
Land at cost 17,204,000      
Buildings at cost 101,915,000      
Total at cost 119,119,000      
Accumulated Depreciation $ 635,000      
Date of Construction 1906      
Date Acquired Sep. 29, 2017      
Life on which depreciation in latest income statements is computed (Years) 41 years      
2017 One [Member] | Phoenix, AZ [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Freestanding ER      
Initial costs, land $ 1,132,000      
Initial costs, buildings 5,052,000      
Land at cost 1,132,000      
Buildings at cost 5,052,000      
Total at cost 6,184,000      
Accumulated Depreciation $ 95,000      
Date of Construction 2017      
Date Acquired Apr. 13, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1962 [Member] | West Monroe, LA [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 12,000,000      
Initial costs, buildings 69,433,000      
Additions subsequent to acquisition, Improvements 10,068,000      
Land at cost 12,552,000      
Buildings at cost 78,949,000      
Total at cost 91,501,000      
Accumulated Depreciation $ 7,705,000      
Date of Construction 1962      
Date Acquired Sep. 26, 2013      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1948 [Member] | Woodland Park, CO [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 54,000      
Initial costs, buildings 428,000      
Land at cost 54,000      
Buildings at cost 428,000      
Total at cost 482,000      
Accumulated Depreciation $ 3,000      
Date of Construction 1948      
Date Acquired Sep. 29, 2017      
Life on which depreciation in latest income statements is computed (Years) 40 years      
1929 [Member] | Youngstown, OH [Member]        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 0      
Type of property Acute care general hospital      
Initial costs, land $ 4,335,000      
Initial costs, buildings 3,565,000      
Land at cost 4,335,000      
Buildings at cost 3,565,000      
Total at cost 7,900,000      
Accumulated Depreciation $ 385,000      
Date of Construction 1929      
Date Acquired May 01, 2017      
Life on which depreciation in latest income statements is computed (Years) 41 years      
[1] Includes real estate cost included in real estate held for sale of $131.3 million at December 31, 2017. Excludes intangible lease assets that are included in real estate held for sale of $15.5 million for 2017.
[2] Includes accumulated depreciation in real estate held for sale of $0.5 million. Excludes accumulated amortization related to intangible lease assets that are included in real estate held for sale of $0.1 million for 2017.