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SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 794,104      
Initial Cost to Company Buildings and Improvements 6,590,274      
Cost Capitalized Subsequent to Acquisition Improvements 472,062      
Cost Capitalized Subsequent to Acquisition Carrying Cost 18,541      
Cost Capitalized Subsequent to Acquisition Other (128,571)      
Gross Amount at Which Carried at Close of Period Land 786,174      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 6,960,236      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 7,746,410 $ 7,655,960 $ 7,566,358 $ 6,743,958
Accumulated Depreciation 1,562,619 $ 1,376,828 $ 1,240,336 $ 1,019,150
Maplewood Real Estate Holdings        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land 166,393      
Initial Cost to Company Buildings and Improvements 357,894      
Cost Capitalized Subsequent to Acquisition Improvements 137,184      
Cost Capitalized Subsequent to Acquisition Carrying Cost 14,478      
Cost Capitalized Subsequent to Acquisition Other (680)      
Gross Amount at Which Carried at Close of Period Land 166,393      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 508,876      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 675,269      
Accumulated Depreciation 47,490      
Maplewood Real Estate Holdings | Massachusetts        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land 19,041      
Initial Cost to Company Buildings and Improvements 113,728      
Cost Capitalized Subsequent to Acquisition Improvements 15,963      
Cost Capitalized Subsequent to Acquisition Other (680)      
Gross Amount at Which Carried at Close of Period Land 19,041      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 129,011      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 148,052      
Accumulated Depreciation $ 16,531      
Date Of Construction 1988-2017      
Date Acquired 2014      
Maplewood Real Estate Holdings | Massachusetts | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 30 years      
Maplewood Real Estate Holdings | Massachusetts | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Maplewood Real Estate Holdings | New York        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 118,606      
Cost Capitalized Subsequent to Acquisition Improvements 93,146      
Cost Capitalized Subsequent to Acquisition Carrying Cost 13,835      
Gross Amount at Which Carried at Close of Period Land 118,606      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 106,981      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total $ 225,587      
Date Of Construction N/A      
Date Acquired 2015      
Maplewood Real Estate Holdings | Ohio        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 3,683      
Initial Cost to Company Buildings and Improvements 27,628      
Cost Capitalized Subsequent to Acquisition Improvements 35      
Gross Amount at Which Carried at Close of Period Land 3,683      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 27,663      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 31,346      
Accumulated Depreciation $ 3,454      
Date Of Construction 1999-2016      
Date Acquired 2013-2014      
Maplewood Real Estate Holdings | Ohio | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 30 years      
Maplewood Real Estate Holdings | Ohio | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Maplewood Real Estate Holdings | Connecticut        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 25,063      
Initial Cost to Company Buildings and Improvements 216,538      
Cost Capitalized Subsequent to Acquisition Improvements 28,040      
Cost Capitalized Subsequent to Acquisition Carrying Cost 643      
Gross Amount at Which Carried at Close of Period Land 25,063      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 245,221      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 270,284      
Accumulated Depreciation $ 27,505      
Date Of Construction 1968-2015      
Date Acquired 2010-2017      
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Agemo Holdings LLC [Member]        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 40,207      
Initial Cost to Company Buildings and Improvements 461,581      
Cost Capitalized Subsequent to Acquisition Improvements 31,431      
Cost Capitalized Subsequent to Acquisition Carrying Cost 630      
Gross Amount at Which Carried at Close of Period Land 40,207      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 493,642      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 533,849      
Accumulated Depreciation 120,453      
Agemo Holdings LLC [Member] | Florida        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land 14,077      
Initial Cost to Company Buildings and Improvements 166,901      
Cost Capitalized Subsequent to Acquisition Improvements 22,877      
Cost Capitalized Subsequent to Acquisition Carrying Cost 630      
Gross Amount at Which Carried at Close of Period Land 14,077      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 190,408      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 204,485      
Accumulated Depreciation $ 55,551      
Date Of Construction 1940-1997      
Date Acquired 1996-2016      
Agemo Holdings LLC [Member] | Florida | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 3 years      
Agemo Holdings LLC [Member] | Florida | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 39 years      
Agemo Holdings LLC [Member] | Georgia        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 3,833      
Initial Cost to Company Buildings and Improvements 10,847      
Cost Capitalized Subsequent to Acquisition Improvements 3,949      
Gross Amount at Which Carried at Close of Period Land 3,833      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 14,796      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 18,629      
Accumulated Depreciation $ 10,200      
Date Of Construction 1964-1970      
Date Acquired 2007      
Life on Which Depreciation in Latest Income Statements is Computed 20 years      
Agemo Holdings LLC [Member] | Kentucky        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 13,153      
Initial Cost to Company Buildings and Improvements 84,321      
Cost Capitalized Subsequent to Acquisition Improvements 3,422      
Gross Amount at Which Carried at Close of Period Land 13,153      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 87,743      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 100,896      
Accumulated Depreciation $ 25,436      
Date Of Construction 1964-1980      
Date Acquired 1999-2016      
Agemo Holdings LLC [Member] | Kentucky | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 20 years      
Agemo Holdings LLC [Member] | Kentucky | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Agemo Holdings LLC [Member] | Maryland        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 1,480      
Initial Cost to Company Buildings and Improvements 19,663      
Cost Capitalized Subsequent to Acquisition Improvements 1,183      
Gross Amount at Which Carried at Close of Period Land 1,480      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 20,846      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 22,326      
Accumulated Depreciation $ 8,542      
Date Of Construction 1959-1977      
Date Acquired 2010      
Agemo Holdings LLC [Member] | Maryland | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 29 years      
Agemo Holdings LLC [Member] | Maryland | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 30 years      
Agemo Holdings LLC [Member] | Tennessee        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 7,664      
Initial Cost to Company Buildings and Improvements 179,849      
Gross Amount at Which Carried at Close of Period Land 7,664      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 179,849      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 187,513      
Accumulated Depreciation $ 20,724      
Date Of Construction 1966-2016      
Date Acquired 2014-2016      
Agemo Holdings LLC [Member] | Tennessee | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 25 years      
Agemo Holdings LLC [Member] | Tennessee | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 30 years      
Saber Health Group        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 32,837      
Initial Cost to Company Buildings and Improvements 425,984      
Cost Capitalized Subsequent to Acquisition Improvements 39,300      
Cost Capitalized Subsequent to Acquisition Carrying Cost 736      
Cost Capitalized Subsequent to Acquisition Other (268)      
Gross Amount at Which Carried at Close of Period Land 32,837      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 465,752      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 498,589      
Accumulated Depreciation 62,763      
Saber Health Group | Ohio        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land 3,028      
Initial Cost to Company Buildings and Improvements 82,070      
Cost Capitalized Subsequent to Acquisition Improvements 5,392      
Cost Capitalized Subsequent to Acquisition Other (268)      
Gross Amount at Which Carried at Close of Period Land 3,028      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 87,194      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 90,222      
Accumulated Depreciation $ 12,436      
Date Of Construction 1979-2000      
Date Acquired 2011-2016      
Saber Health Group | Ohio | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 30 years      
Saber Health Group | Ohio | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Saber Health Group | Florida        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 423      
Initial Cost to Company Buildings and Improvements 4,422      
Cost Capitalized Subsequent to Acquisition Improvements 283      
Gross Amount at Which Carried at Close of Period Land 423      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 4,705      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 5,128      
Accumulated Depreciation $ 776      
Date Of Construction 2009      
Date Acquired 2011      
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Saber Health Group | North Carolina        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 10,077      
Initial Cost to Company Buildings and Improvements 108,680      
Cost Capitalized Subsequent to Acquisition Improvements 25,230      
Cost Capitalized Subsequent to Acquisition Carrying Cost 736      
Gross Amount at Which Carried at Close of Period Land 10,077      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 134,646      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 144,723      
Accumulated Depreciation $ 18,865      
Date Of Construction 1930-2018      
Date Acquired 2013-2016      
Saber Health Group | North Carolina | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 3 years      
Saber Health Group | North Carolina | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 30 years      
Saber Health Group | Pennsylvania        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 7,134      
Initial Cost to Company Buildings and Improvements 124,476      
Cost Capitalized Subsequent to Acquisition Improvements 5,036      
Gross Amount at Which Carried at Close of Period Land 7,134      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 129,512      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 136,646      
Accumulated Depreciation $ 18,345      
Date Of Construction 1873-2002      
Date Acquired 2007-2011      
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Saber Health Group | Virginia        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 12,175      
Initial Cost to Company Buildings and Improvements 106,336      
Cost Capitalized Subsequent to Acquisition Improvements 3,359      
Gross Amount at Which Carried at Close of Period Land 12,175      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 109,695      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 121,870      
Accumulated Depreciation $ 12,341      
Date Of Construction 1964-2013      
Date Acquired 2013-2016      
Life on Which Depreciation in Latest Income Statements is Computed 30 years      
Communicare Health Services, Inc        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 37,036      
Initial Cost to Company Buildings and Improvements 404,013      
Cost Capitalized Subsequent to Acquisition Improvements 21,701      
Cost Capitalized Subsequent to Acquisition Other (408)      
Gross Amount at Which Carried at Close of Period Land 37,036      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 425,306      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 462,342      
Accumulated Depreciation 83,987      
Communicare Health Services, Inc | Ohio        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land 5,206      
Initial Cost to Company Buildings and Improvements 83,288      
Cost Capitalized Subsequent to Acquisition Improvements 5,567      
Cost Capitalized Subsequent to Acquisition Other (702)      
Gross Amount at Which Carried at Close of Period Land 5,206      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 88,153      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 93,359      
Accumulated Depreciation $ 31,675      
Date Of Construction 1962-1988      
Date Acquired 2005-2018      
Communicare Health Services, Inc | Ohio | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 30 years      
Communicare Health Services, Inc | Ohio | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 39 years      
Communicare Health Services, Inc | Maryland        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 7,190      
Initial Cost to Company Buildings and Improvements 74,029      
Cost Capitalized Subsequent to Acquisition Improvements 4,660      
Gross Amount at Which Carried at Close of Period Land 7,190      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 78,689      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 85,879      
Accumulated Depreciation $ 21,124      
Date Of Construction 1921-1985      
Date Acquired 2010-2011      
Communicare Health Services, Inc | Maryland | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 25 years      
Communicare Health Services, Inc | Maryland | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 30 years      
Communicare Health Services, Inc | Pennsylvania        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 1,753      
Initial Cost to Company Buildings and Improvements 18,533      
Cost Capitalized Subsequent to Acquisition Improvements 11,281      
Gross Amount at Which Carried at Close of Period Land 1,753      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 29,814      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 31,567      
Accumulated Depreciation $ 13,817      
Date Of Construction 1950-1964      
Date Acquired 2005      
Life on Which Depreciation in Latest Income Statements is Computed 39 years      
Communicare Health Services, Inc | Virginia        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 2,408      
Initial Cost to Company Buildings and Improvements 10,757      
Cost Capitalized Subsequent to Acquisition Improvements 9      
Gross Amount at Which Carried at Close of Period Land 2,408      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 10,766      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 13,174      
Accumulated Depreciation $ 447      
Date Of Construction 1979      
Date Acquired 2018      
Life on Which Depreciation in Latest Income Statements is Computed 30 years      
Communicare Health Services, Inc | Indiana        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 20,029      
Initial Cost to Company Buildings and Improvements 202,647      
Cost Capitalized Subsequent to Acquisition Other 294      
Gross Amount at Which Carried at Close of Period Land 20,029      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 202,941      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 222,970      
Accumulated Depreciation $ 13,356      
Date Of Construction 1963-2015      
Date Acquired 2013-2018      
Communicare Health Services, Inc | Indiana | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 20 years      
Communicare Health Services, Inc | Indiana | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 30 years      
Communicare Health Services, Inc | West Virginia        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 450      
Initial Cost to Company Buildings and Improvements 14,759      
Cost Capitalized Subsequent to Acquisition Improvements 184      
Gross Amount at Which Carried at Close of Period Land 450      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 14,943      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 15,393      
Accumulated Depreciation $ 3,568      
Date Of Construction 1963      
Date Acquired 2011      
Life on Which Depreciation in Latest Income Statements is Computed 35 years      
Ciena Healthcare        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 25,148      
Initial Cost to Company Buildings and Improvements 431,144      
Cost Capitalized Subsequent to Acquisition Improvements 1,381      
Cost Capitalized Subsequent to Acquisition Other (254)      
Gross Amount at Which Carried at Close of Period Land 24,974      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 432,445      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 457,419      
Accumulated Depreciation 60,412      
Ciena Healthcare | Ohio        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land 10,343      
Initial Cost to Company Buildings and Improvements 159,847      
Cost Capitalized Subsequent to Acquisition Improvements 72      
Cost Capitalized Subsequent to Acquisition Other (80)      
Gross Amount at Which Carried at Close of Period Land 10,343      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 159,839      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 170,182      
Accumulated Depreciation $ 23,287      
Date Of Construction 1960-2007      
Date Acquired 2010-2016      
Ciena Healthcare | Ohio | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 20 years      
Ciena Healthcare | Ohio | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Ciena Healthcare | North Carolina        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 4,097      
Initial Cost to Company Buildings and Improvements 60,275      
Cost Capitalized Subsequent to Acquisition Improvements 1,112      
Gross Amount at Which Carried at Close of Period Land 4,097      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 61,387      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 65,484      
Accumulated Depreciation $ 8,945      
Date Of Construction 1927-1992      
Date Acquired 2014      
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Ciena Healthcare | Virginia        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 6,300      
Initial Cost to Company Buildings and Improvements 87,772      
Cost Capitalized Subsequent to Acquisition Improvements 90      
Cost Capitalized Subsequent to Acquisition Other (174)      
Gross Amount at Which Carried at Close of Period Land 6,126      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 87,862      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 93,988      
Accumulated Depreciation $ 10,240      
Date Of Construction 1979-2007      
Date Acquired 2016      
Life on Which Depreciation in Latest Income Statements is Computed 30 years      
Ciena Healthcare | Indiana        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 321      
Initial Cost to Company Buildings and Improvements 7,703      
Gross Amount at Which Carried at Close of Period Land 321      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 7,703      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 8,024      
Accumulated Depreciation $ 1,229      
Date Of Construction 1973      
Date Acquired 2014      
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Ciena Healthcare | Michigan        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 4,087      
Initial Cost to Company Buildings and Improvements 115,547      
Cost Capitalized Subsequent to Acquisition Improvements 107      
Gross Amount at Which Carried at Close of Period Land 4,087      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 115,654      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 119,741      
Accumulated Depreciation $ 16,711      
Date Of Construction 1964-1997      
Date Acquired 2014      
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Genesis HealthCare        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 36,347      
Initial Cost to Company Buildings and Improvements 344,001      
Cost Capitalized Subsequent to Acquisition Improvements 36,421      
Cost Capitalized Subsequent to Acquisition Other (2)      
Gross Amount at Which Carried at Close of Period Land 36,345      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 380,422      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 416,767      
Accumulated Depreciation 190,550      
Genesis HealthCare | Alabama        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land 1,179      
Initial Cost to Company Buildings and Improvements 22,406      
Cost Capitalized Subsequent to Acquisition Improvements 6,522      
Gross Amount at Which Carried at Close of Period Land 1,179      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 28,928      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 30,107      
Accumulated Depreciation $ 20,082      
Date Of Construction 1964-1974      
Date Acquired 1997      
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Genesis HealthCare | Massachusetts        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 5,389      
Initial Cost to Company Buildings and Improvements 35,826      
Cost Capitalized Subsequent to Acquisition Improvements 2,160      
Gross Amount at Which Carried at Close of Period Land 5,389      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 37,986      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 43,375      
Accumulated Depreciation $ 21,025      
Date Of Construction 1964-1993      
Date Acquired 1997-2010      
Genesis HealthCare | Massachusetts | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 20 years      
Genesis HealthCare | Massachusetts | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 39 years      
Genesis HealthCare | Ohio        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 382      
Initial Cost to Company Buildings and Improvements 11,271      
Cost Capitalized Subsequent to Acquisition Improvements 21      
Gross Amount at Which Carried at Close of Period Land 382      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 11,292      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 11,674      
Accumulated Depreciation $ 7,247      
Date Of Construction 1968-1983      
Date Acquired 1997      
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Genesis HealthCare | Tennessee        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 453      
Initial Cost to Company Buildings and Improvements 7,452      
Cost Capitalized Subsequent to Acquisition Improvements 2,538      
Gross Amount at Which Carried at Close of Period Land 453      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 9,990      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 10,443      
Accumulated Depreciation $ 7,767      
Date Of Construction 1984-1985      
Date Acquired 1994      
Life on Which Depreciation in Latest Income Statements is Computed 30 years      
Genesis HealthCare | North Carolina        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 1,460      
Initial Cost to Company Buildings and Improvements 21,193      
Cost Capitalized Subsequent to Acquisition Improvements 3,550      
Gross Amount at Which Carried at Close of Period Land 1,460      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 24,743      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 26,203      
Accumulated Depreciation $ 19,411      
Date Of Construction 1964-1986      
Date Acquired 1994-1997      
Genesis HealthCare | North Carolina | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 30 years      
Genesis HealthCare | North Carolina | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Genesis HealthCare | West Virginia        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 1,238      
Initial Cost to Company Buildings and Improvements 43,040      
Cost Capitalized Subsequent to Acquisition Improvements 6,528      
Gross Amount at Which Carried at Close of Period Land 1,238      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 49,568      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 50,806      
Accumulated Depreciation $ 29,158      
Date Of Construction 1961-1986      
Date Acquired 1997-2008      
Genesis HealthCare | West Virginia | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 25 years      
Genesis HealthCare | West Virginia | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Genesis HealthCare | Arizona        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 4,847      
Initial Cost to Company Buildings and Improvements 23,084      
Gross Amount at Which Carried at Close of Period Land 4,847      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 23,084      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 27,931      
Accumulated Depreciation $ 3,802      
Date Of Construction 1973-1997      
Date Acquired 2005      
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Genesis HealthCare | California        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 781      
Initial Cost to Company Buildings and Improvements 14,837      
Cost Capitalized Subsequent to Acquisition Improvements 27      
Gross Amount at Which Carried at Close of Period Land 781      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 14,864      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 15,645      
Accumulated Depreciation $ 9,538      
Date Of Construction 1927-1972      
Date Acquired 1997      
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Genesis HealthCare | Colorado        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 5,331      
Initial Cost to Company Buildings and Improvements 33,011      
Cost Capitalized Subsequent to Acquisition Improvements 5,444      
Gross Amount at Which Carried at Close of Period Land 5,331      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 38,455      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 43,786      
Accumulated Depreciation $ 16,189      
Date Of Construction 1963-1975      
Date Acquired 2006      
Life on Which Depreciation in Latest Income Statements is Computed 39 years      
Genesis HealthCare | Idaho        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 3,021      
Initial Cost to Company Buildings and Improvements 16,171      
Cost Capitalized Subsequent to Acquisition Improvements 974      
Cost Capitalized Subsequent to Acquisition Other (2)      
Gross Amount at Which Carried at Close of Period Land 3,019      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 17,145      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 20,164      
Accumulated Depreciation $ 7,307      
Date Of Construction 1920-1987      
Date Acquired 1997-2006      
Genesis HealthCare | Idaho | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 25 years      
Genesis HealthCare | Idaho | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 39 years      
Genesis HealthCare | New Hampshire        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 1,782      
Initial Cost to Company Buildings and Improvements 19,837      
Cost Capitalized Subsequent to Acquisition Improvements 1,463      
Gross Amount at Which Carried at Close of Period Land 1,782      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 21,300      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 23,082      
Accumulated Depreciation $ 9,674      
Date Of Construction 1963-1999      
Date Acquired 1998-2006      
Genesis HealthCare | New Hampshire | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Genesis HealthCare | New Hampshire | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 39 years      
Genesis HealthCare | New Mexico        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 6,008      
Initial Cost to Company Buildings and Improvements 45,285      
Gross Amount at Which Carried at Close of Period Land 6,008      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 45,285      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 51,293      
Accumulated Depreciation $ 6,297      
Date Of Construction 1960-1985      
Date Acquired 2005      
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Genesis HealthCare | Rhode Island        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 3,658      
Initial Cost to Company Buildings and Improvements 35,083      
Cost Capitalized Subsequent to Acquisition Improvements 4,793      
Gross Amount at Which Carried at Close of Period Land 3,658      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 39,876      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 43,534      
Accumulated Depreciation $ 19,172      
Date Of Construction 1965-1981      
Date Acquired 2006      
Life on Which Depreciation in Latest Income Statements is Computed 39 years      
Genesis HealthCare | Vermont        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 318      
Initial Cost to Company Buildings and Improvements 6,005      
Cost Capitalized Subsequent to Acquisition Improvements 602      
Gross Amount at Which Carried at Close of Period Land 318      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 6,607      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 6,925      
Accumulated Depreciation $ 2,767      
Date Of Construction 1971      
Date Acquired 2004      
Life on Which Depreciation in Latest Income Statements is Computed 39 years      
Genesis HealthCare | Washington        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 500      
Initial Cost to Company Buildings and Improvements 9,500      
Cost Capitalized Subsequent to Acquisition Improvements 1,799      
Gross Amount at Which Carried at Close of Period Land 500      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 11,299      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 11,799      
Accumulated Depreciation $ 11,114      
Date Of Construction 1965      
Date Acquired 1995      
Life on Which Depreciation in Latest Income Statements is Computed 20 years      
Other        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 456,136      
Initial Cost to Company Buildings and Improvements 4,165,657      
Cost Capitalized Subsequent to Acquisition Improvements 204,644      
Cost Capitalized Subsequent to Acquisition Carrying Cost 2,697      
Cost Capitalized Subsequent to Acquisition Other (126,959)      
Gross Amount at Which Carried at Close of Period Land 448,382      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 4,253,793      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 4,702,175      
Accumulated Depreciation 996,964      
Other | Alabama        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land 638      
Initial Cost to Company Buildings and Improvements 10,950      
Cost Capitalized Subsequent to Acquisition Improvements 6,393      
Gross Amount at Which Carried at Close of Period Land 638      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 17,343      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 17,981      
Accumulated Depreciation $ 14,986      
Date Of Construction 1960-1982      
Date Acquired 1992      
Life on Which Depreciation in Latest Income Statements is Computed 31 years      
Other | Ohio        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 12,348      
Initial Cost to Company Buildings and Improvements 161,815      
Cost Capitalized Subsequent to Acquisition Improvements 2,880      
Gross Amount at Which Carried at Close of Period Land 12,348      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 164,695      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 177,043      
Accumulated Depreciation $ 31,910      
Date Of Construction 1920-1998      
Date Acquired 1994-2013      
Other | Ohio | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 22 years      
Other | Ohio | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 39 years      
Other | Florida        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 61,684      
Initial Cost to Company Buildings and Improvements 486,947      
Cost Capitalized Subsequent to Acquisition Improvements 88,259      
Cost Capitalized Subsequent to Acquisition Carrying Cost 2,535      
Cost Capitalized Subsequent to Acquisition Other (9,737)      
Gross Amount at Which Carried at Close of Period Land 61,684      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 568,004      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 629,688      
Accumulated Depreciation $ 186,128      
Date Of Construction 1933-2017      
Date Acquired 1992-2017      
Other | Florida | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 2 years      
Other | Florida | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 40 years      
Other | Georgia        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 3,740      
Initial Cost to Company Buildings and Improvements 47,689      
Cost Capitalized Subsequent to Acquisition Improvements 769      
Gross Amount at Which Carried at Close of Period Land 3,740      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 48,458      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 52,198      
Accumulated Depreciation $ 7,892      
Date Of Construction 1967-1997      
Date Acquired 1998-2016      
Other | Georgia | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 30 years      
Other | Georgia | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 40 years      
Other | Kentucky        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 5,611      
Initial Cost to Company Buildings and Improvements 123,995      
Cost Capitalized Subsequent to Acquisition Improvements 9,851      
Gross Amount at Which Carried at Close of Period Land 5,611      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 133,846      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 139,457      
Accumulated Depreciation $ 31,384      
Date Of Construction 1917-2002      
Date Acquired 1994-2014      
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Other | Tennessee        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 4,349      
Initial Cost to Company Buildings and Improvements 74,420      
Cost Capitalized Subsequent to Acquisition Improvements 2,361      
Gross Amount at Which Carried at Close of Period Land 4,349      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 76,781      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 81,130      
Accumulated Depreciation $ 38,056      
Date Of Construction 1974-2008      
Date Acquired 1992-2013      
Other | Tennessee | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 20 years      
Other | Tennessee | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 31 years      
Other | North Carolina        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 2,338      
Initial Cost to Company Buildings and Improvements 39,399      
Cost Capitalized Subsequent to Acquisition Other (711)      
Gross Amount at Which Carried at Close of Period Land 2,338      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 38,688      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 41,026      
Accumulated Depreciation $ 11,940      
Date Of Construction 1969-1987      
Date Acquired 2010-2017      
Other | North Carolina | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 25 years      
Other | North Carolina | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 36 years      
Other | Pennsylvania        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 14,912      
Initial Cost to Company Buildings and Improvements 210,906      
Cost Capitalized Subsequent to Acquisition Other (5)      
Gross Amount at Which Carried at Close of Period Land 14,906      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 210,907      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 225,813      
Accumulated Depreciation $ 60,875      
Date Of Construction 1942-2012      
Date Acquired 2004-2018      
Other | Pennsylvania | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 16 years      
Other | Pennsylvania | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 39 years      
Other | Virginia        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 3,021      
Initial Cost to Company Buildings and Improvements 37,129      
Gross Amount at Which Carried at Close of Period Land 3,021      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 37,129      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 40,150      
Accumulated Depreciation $ 4,328      
Date Of Construction 1989-1995      
Date Acquired 2010-2017      
Other | Virginia | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 30 years      
Other | Virginia | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 40 years      
Other | Indiana        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 25,781      
Initial Cost to Company Buildings and Improvements 335,737      
Cost Capitalized Subsequent to Acquisition Improvements 435      
Cost Capitalized Subsequent to Acquisition Other (1,841)      
Gross Amount at Which Carried at Close of Period Land 25,760      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 334,352      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 360,112      
Accumulated Depreciation $ 94,223      
Date Of Construction 1942-2008      
Date Acquired 1992-2013      
Other | Indiana | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 20 years      
Other | Indiana | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 40 years      
Other | West Virginia        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 285      
Initial Cost to Company Buildings and Improvements 9,148      
Cost Capitalized Subsequent to Acquisition Improvements 348      
Gross Amount at Which Carried at Close of Period Land 285      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 9,496      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 9,781      
Accumulated Depreciation $ 5,465      
Date Of Construction 1961-1996      
Date Acquired 1994-2004      
Other | West Virginia | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Other | West Virginia | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 39 years      
Other | Michigan        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 830      
Initial Cost to Company Buildings and Improvements 30,921      
Gross Amount at Which Carried at Close of Period Land 830      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 30,921      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 31,751      
Accumulated Depreciation $ 7,138      
Date Of Construction 1964-1975      
Date Acquired 2005-2011      
Other | Michigan | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 25 years      
Other | Michigan | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Other | Arizona        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 6,149      
Initial Cost to Company Buildings and Improvements 63,783      
Gross Amount at Which Carried at Close of Period Land 6,149      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 63,783      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 69,932      
Accumulated Depreciation $ 12,367      
Date Of Construction 1949-1999      
Date Acquired 2012-2015      
Other | Arizona | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 35 years      
Other | Arizona | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 40 years      
Other | Arkansas        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 2,893      
Initial Cost to Company Buildings and Improvements 59,094      
Cost Capitalized Subsequent to Acquisition Improvements 8,516      
Cost Capitalized Subsequent to Acquisition Other (36)      
Gross Amount at Which Carried at Close of Period Land 2,893      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 67,574      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 70,467      
Accumulated Depreciation $ 33,435      
Date Of Construction 1967-1988      
Date Acquired 1992-2014      
Other | Arkansas | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 25 years      
Other | Arkansas | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 31 years      
Other | California        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 72,685      
Initial Cost to Company Buildings and Improvements 393,364      
Cost Capitalized Subsequent to Acquisition Improvements 5,103      
Cost Capitalized Subsequent to Acquisition Other (703)      
Gross Amount at Which Carried at Close of Period Land 72,685      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 397,764      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 470,449      
Accumulated Depreciation $ 74,708      
Date Of Construction 1938-2013      
Date Acquired 1997-2014      
Other | California | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 5 years      
Other | California | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 35 years      
Other | Colorado        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 5,949      
Initial Cost to Company Buildings and Improvements 55,819      
Cost Capitalized Subsequent to Acquisition Improvements 2,346      
Gross Amount at Which Carried at Close of Period Land 5,949      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 58,165      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 64,114      
Accumulated Depreciation $ 21,066      
Date Of Construction 1925-1973      
Date Acquired 1998-2016      
Other | Colorado | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 20 years      
Other | Colorado | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Other | Idaho        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 3,604      
Initial Cost to Company Buildings and Improvements 46,182      
Cost Capitalized Subsequent to Acquisition Improvements 348      
Cost Capitalized Subsequent to Acquisition Other (14,690)      
Gross Amount at Which Carried at Close of Period Land 3,604      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 31,840      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 35,444      
Accumulated Depreciation $ 7,377      
Date Of Construction 1911-2008      
Date Acquired 1999-2014      
Other | Idaho | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 30 years      
Other | Idaho | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Other | New Mexico        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 1,222      
Initial Cost to Company Buildings and Improvements 8,638      
Cost Capitalized Subsequent to Acquisition Other (9,660)      
Gross Amount at Which Carried at Close of Period Land 200      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total $ 200      
Date Of Construction 1984      
Date Acquired 2005      
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Other | Connecticut        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 879      
Initial Cost to Company Buildings and Improvements 4,446      
Cost Capitalized Subsequent to Acquisition Improvements 980      
Cost Capitalized Subsequent to Acquisition Other (5,426)      
Gross Amount at Which Carried at Close of Period Land 879      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total $ 879      
Date Of Construction N/A      
Date Acquired 1999      
Other | Illinois        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 382      
Initial Cost to Company Buildings and Improvements 8,228      
Gross Amount at Which Carried at Close of Period Land 382      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 8,228      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 8,610      
Accumulated Depreciation $ 1,216      
Date Of Construction 1963      
Date Acquired 2005      
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Other | Iowa        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 2,485      
Initial Cost to Company Buildings and Improvements 60,406      
Gross Amount at Which Carried at Close of Period Land 2,485      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 60,406      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 62,891      
Accumulated Depreciation $ 11,957      
Date Of Construction 1961-1998      
Date Acquired 2010-2014      
Other | Iowa | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 12 years      
Other | Iowa | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Other | Kansas        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 4,153      
Initial Cost to Company Buildings and Improvements 43,482      
Cost Capitalized Subsequent to Acquisition Improvements 14,219      
Gross Amount at Which Carried at Close of Period Land 4,153      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 57,701      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 61,854      
Accumulated Depreciation $ 11,938      
Date Of Construction 1957-1977      
Date Acquired 2005-2011      
Other | Kansas | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 25 years      
Other | Kansas | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Other | Louisiana        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 4,925      
Initial Cost to Company Buildings and Improvements 52,869      
Cost Capitalized Subsequent to Acquisition Improvements 4,878      
Cost Capitalized Subsequent to Acquisition Other (449)      
Gross Amount at Which Carried at Close of Period Land 4,925      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 57,298      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 62,223      
Accumulated Depreciation $ 21,598      
Date Of Construction 1957-1983      
Date Acquired 1997-2018      
Other | Louisiana | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 22 years      
Other | Louisiana | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 39 years      
Other | Minnesota        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 10,502      
Initial Cost to Company Buildings and Improvements 52,585      
Cost Capitalized Subsequent to Acquisition Improvements 5,971      
Gross Amount at Which Carried at Close of Period Land 10,502      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 58,556      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 69,058      
Accumulated Depreciation $ 9,236      
Date Of Construction 1966-1983      
Date Acquired 2014      
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Other | Mississippi        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 7,925      
Initial Cost to Company Buildings and Improvements 177,825      
Cost Capitalized Subsequent to Acquisition Improvements 827      
Gross Amount at Which Carried at Close of Period Land 7,925      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 178,652      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 186,577      
Accumulated Depreciation $ 21,137      
Date Of Construction 1962-2008      
Date Acquired 2009-2013      
Other | Mississippi | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 20 years      
Other | Mississippi | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 40 years      
Other | Missouri        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 6,063      
Initial Cost to Company Buildings and Improvements 105,351      
Cost Capitalized Subsequent to Acquisition Improvements 693      
Cost Capitalized Subsequent to Acquisition Other (30,351)      
Gross Amount at Which Carried at Close of Period Land 6,055      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 75,701      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 81,756      
Accumulated Depreciation $ 12,434      
Date Of Construction 1955-1994      
Date Acquired 1999-2016      
Other | Missouri | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 30 years      
Other | Missouri | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Other | Montana        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 1,319      
Initial Cost to Company Buildings and Improvements 11,698      
Cost Capitalized Subsequent to Acquisition Improvements 1      
Gross Amount at Which Carried at Close of Period Land 1,319      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 11,699      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 13,018      
Accumulated Depreciation $ 1,736      
Date Of Construction 1963-1971      
Date Acquired 2005      
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Other | Nebraska        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 1,600      
Initial Cost to Company Buildings and Improvements 23,142      
Gross Amount at Which Carried at Close of Period Land 1,600      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 23,142      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 24,742      
Accumulated Depreciation $ 5,025      
Date Of Construction 1963-1969      
Date Acquired 2012-2015      
Other | Nebraska | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 20 years      
Other | Nebraska | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Other | Nevada        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 5,501      
Initial Cost to Company Buildings and Improvements 50,472      
Cost Capitalized Subsequent to Acquisition Improvements 8,350      
Gross Amount at Which Carried at Close of Period Land 5,501      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 58,822      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 64,323      
Accumulated Depreciation $ 15,703      
Date Of Construction 1972-2004      
Date Acquired 2009-2012      
Other | Nevada | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 26 years      
Other | Nevada | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Other | Oklahoma        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 4,650      
Initial Cost to Company Buildings and Improvements 36,247      
Gross Amount at Which Carried at Close of Period Land 4,650      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 36,247      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 40,897      
Accumulated Depreciation $ 11,525      
Date Of Construction 1965-2013      
Date Acquired 2010-2013      
Other | Oklahoma | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 20 years      
Other | Oklahoma | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Other | Oregon        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 3,641      
Initial Cost to Company Buildings and Improvements 45,218      
Cost Capitalized Subsequent to Acquisition Improvements 4,009      
Gross Amount at Which Carried at Close of Period Land 3,641      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 49,227      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 52,868      
Accumulated Depreciation $ 7,553      
Date Of Construction 1959-2004      
Date Acquired 2005-2014      
Other | Oregon | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 25 years      
Other | Oregon | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Other | South Carolina        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 7,800      
Initial Cost to Company Buildings and Improvements 59,782      
Cost Capitalized Subsequent to Acquisition Improvements 443      
Gross Amount at Which Carried at Close of Period Land 7,800      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 60,225      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 68,025      
Accumulated Depreciation $ 11,910      
Date Of Construction 1959-2007      
Date Acquired 2014-2016      
Other | South Carolina | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 20 years      
Other | South Carolina | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Other | Texas        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 68,515      
Initial Cost to Company Buildings and Improvements 732,374      
Cost Capitalized Subsequent to Acquisition Improvements 27,814      
Cost Capitalized Subsequent to Acquisition Carrying Cost 162      
Cost Capitalized Subsequent to Acquisition Other (2,532)      
Gross Amount at Which Carried at Close of Period Land 68,515      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 757,818      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 826,333      
Accumulated Depreciation $ 152,877      
Date Of Construction 1949-2016      
Date Acquired 1997-2018      
Other | Texas | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 20 years      
Other | Texas | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 40 years      
Other | United Kingdom        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 84,119      
Initial Cost to Company Buildings and Improvements 353,800      
Cost Capitalized Subsequent to Acquisition Improvements 1,791      
Cost Capitalized Subsequent to Acquisition Other (44,567)      
Gross Amount at Which Carried at Close of Period Land 77,529      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 317,614      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 395,143      
Accumulated Depreciation $ 32,691      
Date Of Construction 1750-2012      
Date Acquired 2015-2018      
Life on Which Depreciation in Latest Income Statements is Computed 30 years      
Other | Washington        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 11,219      
Initial Cost to Company Buildings and Improvements 128,555      
Cost Capitalized Subsequent to Acquisition Improvements 937      
Cost Capitalized Subsequent to Acquisition Other (2)      
Gross Amount at Which Carried at Close of Period Land 11,218      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 129,491      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 140,709      
Accumulated Depreciation $ 21,333      
Date Of Construction 1930-2004      
Date Acquired 1999-2015      
Other | Washington | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 30 years      
Other | Washington | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 33 years      
Other | Wisconsin        
Real Estate and Accumulated Depreciation [Line Items]        
Initial Cost to Company Land $ 2,419      
Initial Cost to Company Buildings and Improvements 23,241      
Cost Capitalized Subsequent to Acquisition Improvements 6,122      
Cost Capitalized Subsequent to Acquisition Other (6,249)      
Gross Amount at Which Carried at Close of Period Land 2,313      
Gross Amount at Which Carried at Close of Period Buildings and Improvements 23,220      
Gross Amount at Which Carried at Close of Period Land and Buildings and Improvements Total 25,533      
Accumulated Depreciation $ 3,817      
Date Of Construction 1974-1994      
Date Acquired 2005-2012      
Other | Wisconsin | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 30 years      
Other | Wisconsin | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on Which Depreciation in Latest Income Statements is Computed 33 years