PROPERTIES - 2018 Acquisitions and Other (Detail) $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2018 USD ($) facility	Jun. 30, 2018 USD ($) facility	Mar. 31, 2018 USD ($) facility	Dec. 31, 2017 USD ($) facility	Sep. 30, 2017 USD ($) facility	Jun. 30, 2017 USD ($) facility	Mar. 31, 2017 USD ($) facility	Sep. 30, 2016 USD ($) facility	Jun. 30, 2016 USD ($) facility	Mar. 31, 2016 USD ($) facility	Dec. 31, 2018 USD ($) facility	Dec. 31, 2017 USD ($) facility	Dec. 31, 2016 USD ($) facility	Sep. 28, 2018 property
Real Estate Properties [Line Items]
Number of Facilities | facility	924										924
Total Investment											$ 105,700	$ 412,700	$ 1,022,800
Deferred Tax Liabilities, Gross	$ 12,386			$ 14,264							$ 12,386	$ 14,264
Skilled Nursing Facilities
Real Estate Properties [Line Items]
Number of Facilities | facility	12			31							12	31	70
Assisted Living Facilities
Real Estate Properties [Line Items]
Number of Facilities | facility	3			20							3	20	20
Land
Real Estate Properties [Line Items]
Total Investment											$ 13,400	$ 56,700	$ 100,400
Site improvements
Real Estate Properties [Line Items]
Total Investment											86,400	331,500	876,600
Furniture, fixtures and equipment
Real Estate Properties [Line Items]
Total Investment											$ 5,900	$ 24,500	$ 45,800
United Kingdom
Real Estate Properties [Line Items]
Total Investment			$ 4,000			$ 124,200			$ 111,900	$ 8,300
Initial Annual Cash Yield (%)			8.50%			8.50%			7.00%	7.00%
Deferred Tax Liabilities, Gross			$ 400			$ 8,200
United Kingdom | Assisted Living Facilities
Real Estate Properties [Line Items]
Number of Facilities | facility			1			18			10	1
United Kingdom | Land
Real Estate Properties [Line Items]
Total Investment			$ 900			$ 34,100			$ 24,800	$ 1,400
United Kingdom | Site improvements
Real Estate Properties [Line Items]
Total Investment			2,900			85,100			83,900	6,700
United Kingdom | Furniture, fixtures and equipment
Real Estate Properties [Line Items]
Total Investment			200			$ 5,000			3,200	200
UNITED KINGDOM One
Real Estate Properties [Line Items]
Total Investment			$ 5,700							$ 6,100
Initial Annual Cash Yield (%)			8.50%							7.00%
Deferred Tax Liabilities, Gross			$ 200
UNITED KINGDOM One | Assisted Living Facilities
Real Estate Properties [Line Items]
Number of Facilities | facility			1							1
UNITED KINGDOM One | Land
Real Estate Properties [Line Items]
Total Investment			$ 1,400							$ 600
UNITED KINGDOM One | Site improvements
Real Estate Properties [Line Items]
Total Investment			4,100							5,300
UNITED KINGDOM One | Furniture, fixtures and equipment
Real Estate Properties [Line Items]
Total Investment			200							$ 200
Pennsylvania
Real Estate Properties [Line Items]
Total Investment	$ 35,100		$ 7,400
Initial Annual Cash Yield (%)	9.50%		9.50%
Pennsylvania | Skilled Nursing Facilities
Real Estate Properties [Line Items]
Number of Facilities | facility	3		1								3
Pennsylvania | Assisted Living Facilities
Real Estate Properties [Line Items]
Number of Facilities | facility	1										1
Pennsylvania | Land
Real Estate Properties [Line Items]
Total Investment	$ 4,100		$ 1,600
Pennsylvania | Site improvements
Real Estate Properties [Line Items]
Total Investment	29,200		5,400
Pennsylvania | Furniture, fixtures and equipment
Real Estate Properties [Line Items]
Total Investment	1,800		400
Virginia
Real Estate Properties [Line Items]
Total Investment			$ 13,200
Initial Annual Cash Yield (%)			9.50%
Virginia | Skilled Nursing Facilities
Real Estate Properties [Line Items]
Number of Facilities | facility			1
Virginia | Assisted Living Facilities
Real Estate Properties [Line Items]
Number of Facilities | facility							1
Total Investment							$ 7,600
Initial Annual Cash Yield (%)							7.50%
Virginia | Land
Real Estate Properties [Line Items]
Total Investment			$ 2,400
Virginia | Land | Assisted Living Facilities
Real Estate Properties [Line Items]
Total Investment							$ 500
Virginia | Site improvements
Real Estate Properties [Line Items]
Total Investment			10,500
Virginia | Site improvements | Assisted Living Facilities
Real Estate Properties [Line Items]
Total Investment							6,800
Virginia | Furniture, fixtures and equipment
Real Estate Properties [Line Items]
Total Investment			$ 300
Virginia | Furniture, fixtures and equipment | Assisted Living Facilities
Real Estate Properties [Line Items]
Total Investment							$ 300
Texas
Real Estate Properties [Line Items]
Total Investment		$ 22,800		$ 40,000	$ 2,300				$ 66,000
Initial Annual Cash Yield (%)		9.50%		9.25%	9.25%				6.80%
Texas | Skilled Nursing Facilities
Real Estate Properties [Line Items]
Number of Facilities | facility		5		6								6
Texas | Assisted Living Facilities
Real Estate Properties [Line Items]
Number of Facilities | facility					1				3
Texas | Land
Real Estate Properties [Line Items]
Total Investment		$ 500		$ 1,000	$ 700				$ 5,800
Texas | Site improvements
Real Estate Properties [Line Items]
Total Investment		20,400		35,100	1,500				58,600
Texas | Furniture, fixtures and equipment
Real Estate Properties [Line Items]
Total Investment		$ 1,900		$ 3,900	100				$ 1,600
Indiana
Real Estate Properties [Line Items]
Total Investment	$ 8,300				$ 211,000
Initial Annual Cash Yield (%)	9.50%				9.50%
Indiana | Skilled Nursing Facilities
Real Estate Properties [Line Items]
Number of Facilities | facility	1				15						1
Indiana | Land
Real Estate Properties [Line Items]
Total Investment	$ 1,700				$ 18,000
Indiana | Site improvements
Real Estate Properties [Line Items]
Total Investment	6,000				180,200
Indiana | Furniture, fixtures and equipment
Real Estate Properties [Line Items]
Total Investment	600				$ 12,800
Ohio
Real Estate Properties [Line Items]
Total Investment	$ 9,200							$ 9,000
Initial Annual Cash Yield (%)	9.50%							9.00%
Ohio | Skilled Nursing Facilities
Real Estate Properties [Line Items]
Number of Facilities | facility	1							1			1
Ohio | Land
Real Estate Properties [Line Items]
Total Investment	$ 800
Ohio | Site improvements
Real Estate Properties [Line Items]
Total Investment	7,900							$ 8,600
Ohio | Furniture, fixtures and equipment
Real Estate Properties [Line Items]
Total Investment	$ 500							$ 400
Skilled Nursing Facilities
Real Estate Properties [Line Items]
Number of Facilities | property														7
Assisted Living Facilities
Real Estate Properties [Line Items]
Number of Facilities | property														1