PROPERTIES (Schedule of Significant Acquisitions) (Detail) $ in Thousands	1 Months Ended	3 Months Ended											12 Months Ended
	Jul. 31, 2017 USD ($) facility	Dec. 31, 2019 USD ($) facility	Sep. 30, 2019 USD ($) facility	Jun. 30, 2019 USD ($) facility	Mar. 31, 2019 USD ($) facility	Dec. 31, 2018 USD ($) 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	Dec. 31, 2019 USD ($) facility	Dec. 31, 2018 USD ($) facility	Dec. 31, 2017 USD ($) facility	Oct. 31, 2019 facility
Real Estate Properties [Line Items]
Number of real estate properties | facility		987											987
Payments to acquire businesses, gross													$ 1,325,400	$ 105,700	$ 412,700
Deferred tax liability		$ 10,151				$ 12,386							$ 10,151	$ 12,386
Ohio
Real Estate Properties [Line Items]
Payments to acquire businesses, gross					$ 11,900	$ 9,200
Initial Annual Cash Yield (%)					12.00%	9.50%
California Connecticut Indiana, Nevada, South Carolina Tennessee and Texas [Member]
Real Estate Properties [Line Items]
Payments to acquire businesses, gross				$ 421,600
Initial Annual Cash Yield (%)				10.27%
North Carolina and Virginia
Real Estate Properties [Line Items]
Payments to acquire businesses, gross			$ 24,900
Initial Annual Cash Yield (%)			9.50%
Virginia
Real Estate Properties [Line Items]
Payments to acquire businesses, gross								$ 13,200				$ 7,600
Initial Annual Cash Yield (%)								9.50%				7.50%
North Carolina
Real Estate Properties [Line Items]
Payments to acquire businesses, gross											$ 8,600
Initial Annual Cash Yield (%)											9.50%
United Kingdom
Real Estate Properties [Line Items]
Payments to acquire businesses, gross								$ 4,000			$ 124,200
Initial Annual Cash Yield (%)								8.50%			8.50%
Deferred tax liability								$ 400			$ 8,200
Acquisitions costs											1,200
UNITED KINGDOM One
Real Estate Properties [Line Items]
Payments to acquire businesses, gross								$ 5,700
Initial Annual Cash Yield (%)								8.50%
Deferred tax liability								$ 200
Texas
Real Estate Properties [Line Items]
Payments to acquire businesses, gross							$ 22,800		$ 40,000	$ 2,300
Initial Annual Cash Yield (%)							9.50%		9.25%	9.25%
Texas Two [Member]
Real Estate Properties [Line Items]
Payments to acquire businesses, gross										$ 19,000
Initial Annual Cash Yield (%)										18.60%
Indiana
Real Estate Properties [Line Items]
Payments to acquire businesses, gross						$ 8,300				$ 211,000
Initial Annual Cash Yield (%)						9.50%				9.50%
Pennsylvania And Virginia [Member]
Real Estate Properties [Line Items]
Payments to acquire businesses, gross				$ 131,800
Initial Annual Cash Yield (%)				9.35%
Pennsylvania
Real Estate Properties [Line Items]
Payments to acquire businesses, gross						$ 35,100		$ 7,400
Initial Annual Cash Yield (%)						9.50%		9.50%
Florida Idaho Kentucky Louisiana Mississippi Missouri Montana And North Carolina [Member]
Real Estate Properties [Line Items]
Payments to acquire businesses, gross		$ 735,200
Initial Annual Cash Yield (%)		8.71%
Skilled Nursing Facilities
Real Estate Properties [Line Items]
Number of real estate properties | facility		784				12							784	12
Skilled Nursing Facilities | Ohio
Real Estate Properties [Line Items]
Number of real estate properties | facility						1								1
Skilled Nursing Facilities | Virginia
Real Estate Properties [Line Items]
Number of real estate properties | facility								1
Skilled Nursing Facilities | Texas
Real Estate Properties [Line Items]
Number of real estate properties | facility							5
Skilled Nursing Facilities | Indiana
Real Estate Properties [Line Items]
Number of real estate properties | facility						1								1
Skilled Nursing Facilities | Pennsylvania
Real Estate Properties [Line Items]
Number of real estate properties | facility						3		1						3
Assisted Living Facilities
Real Estate Properties [Line Items]
Number of real estate properties | facility		114											114
Assisted Living and Independent Living Facilities
Real Estate Properties [Line Items]
Number of real estate properties | facility						3								3
Assisted Living and Independent Living Facilities | United Kingdom
Real Estate Properties [Line Items]
Number of real estate properties | facility								1
Assisted Living and Independent Living Facilities | UNITED KINGDOM One
Real Estate Properties [Line Items]
Number of real estate properties | facility								1
Assisted Living and Independent Living Facilities | Pennsylvania
Real Estate Properties [Line Items]
Number of real estate properties | facility						1								1
Specialty
Real Estate Properties [Line Items]
Number of real estate properties | facility		28											28
Medical Office Building
Real Estate Properties [Line Items]
Number of real estate properties | facility		2											2
Land
Real Estate Properties [Line Items]
Payments to acquire businesses, gross													$ 116,800	$ 13,400	56,700
Land | Ohio
Real Estate Properties [Line Items]
Payments to acquire businesses, gross					$ 1,100	$ 800
Land | California Connecticut Indiana, Nevada, South Carolina Tennessee and Texas [Member]
Real Estate Properties [Line Items]
Payments to acquire businesses, gross				$ 40,100
Land | North Carolina and Virginia
Real Estate Properties [Line Items]
Payments to acquire businesses, gross			$ 4,200
Land | Virginia
Real Estate Properties [Line Items]
Payments to acquire businesses, gross								$ 2,400				$ 500
Land | North Carolina
Real Estate Properties [Line Items]
Payments to acquire businesses, gross											700
Land | United Kingdom
Real Estate Properties [Line Items]
Payments to acquire businesses, gross								900			34,100
Land | UNITED KINGDOM One
Real Estate Properties [Line Items]
Payments to acquire businesses, gross								1,400
Land | Texas
Real Estate Properties [Line Items]
Payments to acquire businesses, gross							$ 500		$ 1,000	$ 700
Land | Texas Two [Member]
Real Estate Properties [Line Items]
Payments to acquire businesses, gross										1,700
Land | Indiana
Real Estate Properties [Line Items]
Payments to acquire businesses, gross						1,700				18,000
Land | Pennsylvania And Virginia [Member]
Real Estate Properties [Line Items]
Payments to acquire businesses, gross				9,900
Land | Pennsylvania
Real Estate Properties [Line Items]
Payments to acquire businesses, gross						4,100		1,600
Land | Florida Idaho Kentucky Louisiana Mississippi Missouri Montana And North Carolina [Member]
Real Estate Properties [Line Items]
Payments to acquire businesses, gross		$ 61,500
Furniture and Equipment
Real Estate Properties [Line Items]
Payments to acquire businesses, gross													78,900	5,900	24,500
Furniture and Equipment | Ohio
Real Estate Properties [Line Items]
Payments to acquire businesses, gross					700	500
Furniture and Equipment | California Connecticut Indiana, Nevada, South Carolina Tennessee and Texas [Member]
Real Estate Properties [Line Items]
Payments to acquire businesses, gross				12,600
Furniture and Equipment | North Carolina and Virginia
Real Estate Properties [Line Items]
Payments to acquire businesses, gross			2,100
Furniture and Equipment | Virginia
Real Estate Properties [Line Items]
Payments to acquire businesses, gross								300				300
Furniture and Equipment | North Carolina
Real Estate Properties [Line Items]
Payments to acquire businesses, gross											600
Furniture and Equipment | United Kingdom
Real Estate Properties [Line Items]
Payments to acquire businesses, gross								200			5,000
Furniture and Equipment | UNITED KINGDOM One
Real Estate Properties [Line Items]
Payments to acquire businesses, gross								200
Furniture and Equipment | Texas
Real Estate Properties [Line Items]
Payments to acquire businesses, gross							1,900		3,900	100
Furniture and Equipment | Texas Two [Member]
Real Estate Properties [Line Items]
Payments to acquire businesses, gross										1,800
Furniture and Equipment | Indiana
Real Estate Properties [Line Items]
Payments to acquire businesses, gross						600				12,800
Furniture and Equipment | Pennsylvania And Virginia [Member]
Real Estate Properties [Line Items]
Payments to acquire businesses, gross				9,200
Furniture and Equipment | Pennsylvania
Real Estate Properties [Line Items]
Payments to acquire businesses, gross						1,800		400
Furniture and Equipment | Florida Idaho Kentucky Louisiana Mississippi Missouri Montana And North Carolina [Member]
Real Estate Properties [Line Items]
Payments to acquire businesses, gross		54,300
Building And Site Improvements
Real Estate Properties [Line Items]
Payments to acquire businesses, gross													$ 1,129,700	$ 86,400	$ 331,500
Building And Site Improvements | Ohio
Real Estate Properties [Line Items]
Payments to acquire businesses, gross					$ 10,100	7,900
Building And Site Improvements | California Connecticut Indiana, Nevada, South Carolina Tennessee and Texas [Member]
Real Estate Properties [Line Items]
Payments to acquire businesses, gross				368,900
Building And Site Improvements | North Carolina and Virginia
Real Estate Properties [Line Items]
Payments to acquire businesses, gross			$ 18,600
Building And Site Improvements | Virginia
Real Estate Properties [Line Items]
Payments to acquire businesses, gross								10,500				$ 6,800
Building And Site Improvements | North Carolina
Real Estate Properties [Line Items]
Payments to acquire businesses, gross											7,300
Building And Site Improvements | United Kingdom
Real Estate Properties [Line Items]
Payments to acquire businesses, gross								2,900			$ 85,100
Building And Site Improvements | UNITED KINGDOM One
Real Estate Properties [Line Items]
Payments to acquire businesses, gross								4,100
Building And Site Improvements | Texas
Real Estate Properties [Line Items]
Payments to acquire businesses, gross							$ 20,400		$ 35,100	1,500
Building And Site Improvements | Texas Two [Member]
Real Estate Properties [Line Items]
Payments to acquire businesses, gross										15,500
Building And Site Improvements | Indiana
Real Estate Properties [Line Items]
Payments to acquire businesses, gross						6,000				$ 180,200
Building And Site Improvements | Pennsylvania And Virginia [Member]
Real Estate Properties [Line Items]
Payments to acquire businesses, gross				$ 112,700
Building And Site Improvements | Pennsylvania
Real Estate Properties [Line Items]
Payments to acquire businesses, gross						$ 29,200		$ 5,400
Building And Site Improvements | Florida Idaho Kentucky Louisiana Mississippi Missouri Montana And North Carolina [Member]
Real Estate Properties [Line Items]
Payments to acquire businesses, gross		$ 619,400
Facilities Acquired [Member]
Real Estate Properties [Line Items]
Number of real estate properties | facility																60
Facilities Acquired [Member] | Skilled Nursing Facilities
Real Estate Properties [Line Items]
Number of real estate properties | facility		89							31				89		31
Facilities Acquired [Member] | Skilled Nursing Facilities | Ohio
Real Estate Properties [Line Items]
Number of real estate properties | facility					1
Facilities Acquired [Member] | Skilled Nursing Facilities | California Connecticut Indiana, Nevada, South Carolina Tennessee and Texas [Member]
Real Estate Properties [Line Items]
Number of real estate properties | facility				20
Facilities Acquired [Member] | Skilled Nursing Facilities | North Carolina and Virginia
Real Estate Properties [Line Items]
Number of real estate properties | facility			3
Facilities Acquired [Member] | Skilled Nursing Facilities | North Carolina
Real Estate Properties [Line Items]
Number of real estate properties | facility											1
Facilities Acquired [Member] | Skilled Nursing Facilities | Texas
Real Estate Properties [Line Items]
Number of real estate properties | facility									6						6
Facilities Acquired [Member] | Skilled Nursing Facilities | Texas Two [Member]
Real Estate Properties [Line Items]
Number of real estate properties | facility										9
Facilities Acquired [Member] | Skilled Nursing Facilities | Indiana
Real Estate Properties [Line Items]
Number of real estate properties | facility										15
Facilities Acquired [Member] | Skilled Nursing Facilities | Pennsylvania And Virginia [Member]
Real Estate Properties [Line Items]
Number of real estate properties | facility				7
Facilities Acquired [Member] | Skilled Nursing Facilities | Florida Idaho Kentucky Louisiana Mississippi Missouri Montana And North Carolina [Member]
Real Estate Properties [Line Items]
Number of real estate properties | facility		58											58
Facilities Acquired [Member] | Assisted Living Facilities
Real Estate Properties [Line Items]
Number of real estate properties | facility		4											4
Facilities Acquired [Member] | Assisted Living Facilities | California Connecticut Indiana, Nevada, South Carolina Tennessee and Texas [Member]
Real Estate Properties [Line Items]
Number of real estate properties | facility				1
Facilities Acquired [Member] | Assisted Living Facilities | Pennsylvania And Virginia [Member]
Real Estate Properties [Line Items]
Number of real estate properties | facility				1
Facilities Acquired [Member] | Assisted Living Facilities | Florida Idaho Kentucky Louisiana Mississippi Missouri Montana And North Carolina [Member]
Real Estate Properties [Line Items]
Number of real estate properties | facility		2											2
Facilities Acquired [Member] | Assisted Living and Independent Living Facilities
Real Estate Properties [Line Items]
Number of real estate properties | facility									20						20
Facilities Acquired [Member] | Assisted Living and Independent Living Facilities | Virginia
Real Estate Properties [Line Items]
Number of real estate properties | facility												1
Facilities Acquired [Member] | Assisted Living and Independent Living Facilities | United Kingdom
Real Estate Properties [Line Items]
Number of real estate properties | facility											18
Facilities Acquired [Member] | Assisted Living and Independent Living Facilities | Texas
Real Estate Properties [Line Items]
Number of real estate properties | facility										1
Facilities Acquired [Member] | Specialty
Real Estate Properties [Line Items]
Number of real estate properties | facility		14											14
Facilities Acquired [Member] | Specialty | California Connecticut Indiana, Nevada, South Carolina Tennessee and Texas [Member]
Real Estate Properties [Line Items]
Number of real estate properties | facility				11
Facilities Acquired [Member] | Specialty | Pennsylvania And Virginia [Member]
Real Estate Properties [Line Items]
Number of real estate properties | facility				3
Facilities Acquired [Member] | Medical Office Building
Real Estate Properties [Line Items]
Number of real estate properties | facility		1											1
Facilities Acquired [Member] | Medical Office Building | California Connecticut Indiana, Nevada, South Carolina Tennessee and Texas [Member]
Real Estate Properties [Line Items]
Number of real estate properties | facility				1
Facilities Transitioned To Five Other Operators [Member] | Skilled Nursing Facilities
Real Estate Properties [Line Items]
Number of real estate properties | facility						21								21
Facilities Transitioned To Five Other Operators [Member] | Assisted Living Facilities
Real Estate Properties [Line Items]
Number of real estate properties | facility						1								1
Facilities Transitioned to Other Operators [Member] | Skilled Nursing Facilities
Real Estate Properties [Line Items]
Number of real estate properties | facility	9
Recorded an impairment on direct financing lease	$ 1,800
Restructuring and Related Cost, Incurred Cost	$ 1,800