PROPERTIES - 2016 Acquisitions and Other (Detail) $ in Millions	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	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
Real Estate Properties [Line Items]
Number of Facilities | facility	924									924
Total Investment										$ 105.7	$ 412.7	$ 1,022.8
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										$ 13.4	$ 56.7	$ 100.4
Site improvements
Real Estate Properties [Line Items]
Total Investment										86.4	331.5	876.6
Furniture, fixtures and equipment
Real Estate Properties [Line Items]
Total Investment										$ 5.9	$ 24.5	$ 45.8
United Kingdom
Real Estate Properties [Line Items]
Total Investment			$ 4.0			$ 124.2		$ 111.9	$ 8.3
Initial Annual Cash Yield (%)			8.50%			8.50%		7.00%	7.00%
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			$ 0.9			$ 34.1		$ 24.8	$ 1.4
United Kingdom | Site improvements
Real Estate Properties [Line Items]
Total Investment			2.9			85.1		83.9	6.7
United Kingdom | Furniture, fixtures and equipment
Real Estate Properties [Line Items]
Total Investment			0.2			$ 5.0		3.2	0.2
UNITED KINGDOM One
Real Estate Properties [Line Items]
Total Investment			$ 5.7						$ 6.1
Initial Annual Cash Yield (%)			8.50%						7.00%
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			$ 1.4						$ 0.6
UNITED KINGDOM One | Site improvements
Real Estate Properties [Line Items]
Total Investment			4.1						5.3
UNITED KINGDOM One | Furniture, fixtures and equipment
Real Estate Properties [Line Items]
Total Investment			$ 0.2						0.2
Ohio Virginia And Michigan [Member]
Real Estate Properties [Line Items]
Total Investment									$ 169.0
Initial Annual Cash Yield (%)									8.50%
Ohio Virginia And Michigan [Member] | Skilled Nursing Facilities
Real Estate Properties [Line Items]
Number of Facilities | facility									10
Ohio Virginia And Michigan [Member] | Land
Real Estate Properties [Line Items]
Total Investment									$ 10.5
Ohio Virginia And Michigan [Member] | Site improvements
Real Estate Properties [Line Items]
Total Investment									152.5
Ohio Virginia And Michigan [Member] | Furniture, fixtures and equipment
Real Estate Properties [Line Items]
Total Investment									6.0
Florida
Real Estate Properties [Line Items]
Total Investment							$ 4.3
Initial Annual Cash Yield (%)							8.00%
Florida | Assisted Living Facilities
Real Estate Properties [Line Items]
Number of Facilities | facility							1
Florida | Land
Real Estate Properties [Line Items]
Total Investment							$ 2.3
Florida | Site improvements
Real Estate Properties [Line Items]
Total Investment							1.8
Florida | Furniture, fixtures and equipment
Real Estate Properties [Line Items]
Total Investment							0.2
Florida One [Member]
Real Estate Properties [Line Items]
Total Investment							$ 16.5
Initial Annual Cash Yield (%)							8.00%
Florida One [Member] | Assisted Living Facilities
Real Estate Properties [Line Items]
Number of Facilities | facility							1
Florida One [Member] | Land
Real Estate Properties [Line Items]
Total Investment							$ 1.8
Florida One [Member] | Site improvements
Real Estate Properties [Line Items]
Total Investment							14.3
Florida One [Member] | Furniture, fixtures and equipment
Real Estate Properties [Line Items]
Total Investment							0.4
Georgia
Real Estate Properties [Line Items]
Total Investment							$ 2.5		$ 20.2
Initial Annual Cash Yield (%)							8.00%		7.50%
Georgia | Assisted Living Facilities
Real Estate Properties [Line Items]
Number of Facilities | facility							1		2
Georgia | Land
Real Estate Properties [Line Items]
Total Investment							$ 0.2		$ 0.8
Georgia | Site improvements
Real Estate Properties [Line Items]
Total Investment							2.1		18.3
Georgia | Furniture, fixtures and equipment
Real Estate Properties [Line Items]
Total Investment							0.2		1.1
Maryland
Real Estate Properties [Line Items]
Total Investment									$ 25.0
Initial Annual Cash Yield (%)									8.50%
Maryland | Skilled Nursing Facilities
Real Estate Properties [Line Items]
Number of Facilities | facility									3
Maryland | Land
Real Estate Properties [Line Items]
Total Investment									$ 2.5
Maryland | Site improvements
Real Estate Properties [Line Items]
Total Investment									19.9
Maryland | Furniture, fixtures and equipment
Real Estate Properties [Line Items]
Total Investment									2.6
Virginia And North Carolina [Member]
Real Estate Properties [Line Items]
Total Investment									$ 212.5
Initial Annual Cash Yield (%)									8.50%
Virginia And North Carolina [Member] | Skilled Nursing Facilities
Real Estate Properties [Line Items]
Number of Facilities | facility									21
Virginia And North Carolina [Member] | Land
Real Estate Properties [Line Items]
Total Investment									$ 19.3
Virginia And North Carolina [Member] | Site improvements
Real Estate Properties [Line Items]
Total Investment									181.1
Virginia And North Carolina [Member] | Furniture, fixtures and equipment
Real Estate Properties [Line Items]
Total Investment									$ 12.1
Texas
Real Estate Properties [Line Items]
Total Investment		$ 22.8		$ 40.0	$ 2.3			$ 66.0
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		$ 0.5		$ 1.0	$ 0.7			$ 5.8
Texas | Site improvements
Real Estate Properties [Line Items]
Total Investment		20.4		35.1	1.5			58.6
Texas | Furniture, fixtures and equipment
Real Estate Properties [Line Items]
Total Investment		$ 1.9		$ 3.9	0.1			1.6
Texas Two [Member]
Real Estate Properties [Line Items]
Total Investment					$ 19.0
Initial Annual Cash Yield (%)					18.60%
Texas Two [Member] | Skilled Nursing Facilities
Real Estate Properties [Line Items]
Number of Facilities | facility					9
Texas Two [Member] | Land
Real Estate Properties [Line Items]
Total Investment					$ 1.7
Texas Two [Member] | Site improvements
Real Estate Properties [Line Items]
Total Investment					15.5
Texas Two [Member] | Furniture, fixtures and equipment
Real Estate Properties [Line Items]
Total Investment					$ 1.8
Colorado And Missouri [Member]
Real Estate Properties [Line Items]
Total Investment								$ 31.8
Initial Annual Cash Yield (%)								9.00%
Colorado And Missouri [Member] | Skilled Nursing Facilities
Real Estate Properties [Line Items]
Number of Facilities | facility								3
Colorado And Missouri [Member] | Land
Real Estate Properties [Line Items]
Total Investment								$ 3.1
Colorado And Missouri [Member] | Site improvements
Real Estate Properties [Line Items]
Total Investment								26.2
Colorado And Missouri [Member] | Furniture, fixtures and equipment
Real Estate Properties [Line Items]
Total Investment								$ 2.5
South Carolina
Real Estate Properties [Line Items]
Total Investment							$ 10.1
Initial Annual Cash Yield (%)							9.00%
South Carolina | Skilled Nursing Facilities
Real Estate Properties [Line Items]
Number of Facilities | facility							1
South Carolina | Land
Real Estate Properties [Line Items]
Total Investment							$ 2.7
South Carolina | Site improvements
Real Estate Properties [Line Items]
Total Investment							6.5
South Carolina | Furniture, fixtures and equipment
Real Estate Properties [Line Items]
Total Investment							0.9
Ohio
Real Estate Properties [Line Items]
Total Investment	$ 9.2						$ 9.0
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	$ 0.8
Ohio | Site improvements
Real Estate Properties [Line Items]
Total Investment	7.9						$ 8.6
Ohio | Furniture, fixtures and equipment
Real Estate Properties [Line Items]
Total Investment	$ 0.5						0.4
FL, KY,TN
Real Estate Properties [Line Items]
Total Investment							$ 329.6
Initial Annual Cash Yield (%)							9.00%
FL, KY,TN | Skilled Nursing Facilities
Real Estate Properties [Line Items]
Number of Facilities | facility							31
FL, KY,TN | Land
Real Estate Properties [Line Items]
Total Investment							$ 24.6
FL, KY,TN | Site improvements
Real Estate Properties [Line Items]
Total Investment							290.8
FL, KY,TN | Furniture, fixtures and equipment
Real Estate Properties [Line Items]
Total Investment							$ 14.2