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PROPERTIES - Assets Sold or Held for Sale (Narrative) (Detail) $ in Thousands		3 Months Ended			12 Months Ended
	Jan. 01, 2018 USD ($)	Dec. 31, 2018 USD ($) facility	Jun. 30, 2018 USD ($) facility	Dec. 31, 2017 USD ($) facility	Dec. 31, 2018 USD ($) facility	Dec. 31, 2017 USD ($) item facility	Dec. 31, 2016 USD ($) facility	Sep. 30, 2018 facility	Sep. 30, 2017 facility	Dec. 31, 2015 facility
Real Estate Properties [Line Items]
Number of previously classified as held for sale \| facility				22		22	14	9	2	3
Total cash proceeds		$ 63,200		$ 188,000	$ 309,600	$ 257,800	$ 169,600
Amount of gain (loss) from sale of facilities		15,500		46,400	24,800	53,900	50,200
Provision for impairment on real estate properties		$ 3,200		$ 63,500	$ 35,000	$ 99,100	$ 58,700
Number of facilities with impairment charges \| facility		3		32	35	37
Number of subsequently reclassified as held for sale \| facility		2		2
Total proceeds					$ 164,000
Impairment offset by insurance recovery					5,200
Real estate investments		$ 7,746,410		$ 7,655,960	7,746,410	$ 7,655,960
Real estate investments		$ 504,626		$ 276,715	$ 504,626	$ 276,715
Number of facilities sold \| facility		14		32	78	52	38
Impairment on real estate properties destroyed in a fire				$ 12,600
Number of facility destroyed in fire \| facility				1
Wrote off associated with the termination project						$ 2,600
Number of operator \| item						2
Deferred gain (loss) on sale of loans	$ 10,000
Recorded investment properties after impairments					$ 14,800	$ 125,100
Properties classified as held for sale after impairment		$ 1,000		$ 7,700	$ 1,000	7,700
Minimum
Real Estate Properties [Line Items]
Claims against indemnities term					18 months
Maximum
Real Estate Properties [Line Items]
Claims against indemnities term					36 months
Land
Real Estate Properties [Line Items]
Real estate investments		786,174		795,874	$ 786,174	795,874
Site improvements
Real Estate Properties [Line Items]
Real estate investments		250,917		227,150	250,917	227,150
Furniture, fixtures and equipment
Real Estate Properties [Line Items]
Real estate investments		447,610		440,737	447,610	440,737
Existing Operator \| Land
Real Estate Properties [Line Items]
Real estate investments		11,200			11,200
Existing Operator \| Site improvements
Real Estate Properties [Line Items]
Real estate investments		159,100			159,100
Existing Operator \| Furniture, fixtures and equipment
Real Estate Properties [Line Items]
Real estate investments		14,200			14,200
Real Estate Investment \| Existing Operator
Real Estate Properties [Line Items]
Real estate investments		184,500			184,500
21 Skilled Nursing Facilities and 1 Assisted Living Facility
Real Estate Properties [Line Items]
Carrying amount of facility Net		184,500			$ 184,500
Percentage of annual cash yield					9.00%
21 Skilled Nursing Facilities and 1 Assisted Living Facility \| Working Capital Loans [Member]
Real Estate Properties [Line Items]
Maximum borrowing capacity		45,700			$ 45,700
21 Skilled Nursing Facilities and 1 Assisted Living Facility \| Commitments to Fund Capital Improvement
Real Estate Properties [Line Items]
Real estate investments		10,600			10,600
21 Skilled Nursing Facilities and 1 Assisted Living Facility \| Indemnity Funding
Real Estate Properties [Line Items]
Real estate investments		$ 7,400			7,400
Skilled Nursing Facilities
Real Estate Properties [Line Items]
Total cash proceeds					25,000
Amount of gain (loss) from sale of facilities					$ (4,600)	17,500
Number of facilities with impairment charges \| facility							29
Number of facilities transitioned \| facility		21			21
Carrying amount of facility, operating			$ 62,000
Total proceeds			78,000			43,300
Assumption of HUD mortgages			53,000
Closing cost					$ 5,000	$ 2,600
Unsecured loan to principal			$ 39,700
Number of facilities sold \| facility			12
Number of facility not qualify for sale \| facility						10
Carrying amount of facility				$ 23,200		$ 23,200
Recognized net gain sale of loan						7,500
Deferred gain (loss) on sale of loans						$ 10,000
Skilled Nursing Facilities \| 21 Skilled Nursing Facilities and 1 Assisted Living Facility
Real Estate Properties [Line Items]
Amount of gain (loss) from sale of facilities					$ 11,000
Assisted Living Facilities
Real Estate Properties [Line Items]
Number of facilities transitioned \| facility		1			1