PROPERTIES - 2017 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 ($) facility	Jun. 30, 2016 USD ($) facility	Mar. 31, 2016 USD ($) facility	Dec. 31, 2018 USD ($) facility property	Dec. 31, 2017 USD ($) facility property	Dec. 31, 2016 USD ($) facility property
Real Estate Properties [Line Items]
Number of Facilities | facility	924									924
Total Investment										$ 105,700	$ 412,700	$ 1,022,800
Deferred tax liability	$ 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
Number Of Properties Added | property										2	3	5
3 Parcels of Land Acquired [Member}
Real Estate Properties [Line Items]
Total Investment											$ 6,700
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
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
North Carolina
Real Estate Properties [Line Items]
Total Investment						$ 8,600
Initial Annual Cash Yield (%)						9.50%
North Carolina | Skilled Nursing Facilities
Real Estate Properties [Line Items]
Number of Facilities | facility						1
North Carolina | Land
Real Estate Properties [Line Items]
Total Investment						$ 700
North Carolina | Site improvements
Real Estate Properties [Line Items]
Total Investment						7,300
North Carolina | Furniture, fixtures and equipment
Real Estate Properties [Line Items]
Total Investment						600
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 liability			$ 400			$ 8,200
Acquisitions costs						$ 1,200
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
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 | Skilled Nursing Facilities | Other Restructuring [Member]
Real Estate Properties [Line Items]
Number of Facilities | facility					9
Recorded an impairment on direct financing lease					$ 1,800
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