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PROPERTIES (Asset Sales, Impairments and Other) (Narrative) (Detail) $ in Thousands			3 Months Ended	12 Months Ended
	Jun. 01, 2018 USD ($) facility	Jan. 01, 2018 USD ($)	Dec. 31, 2019 USD ($) facility	Dec. 31, 2019 USD ($) facility	Dec. 31, 2018 USD ($) facility	Dec. 31, 2017 USD ($) item 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
Real estate investments - net			$ 7,198,569	7,198,569	6,183,791
11 Facilities
Real Estate Properties [Line Items]
Total cash proceeds			33,300
Amount of gain (loss) from sale of facilities			2,900
10 Facilities
Real Estate Properties [Line Items]
Amount of gain (loss) from sale of facilities						7,500
12 Facilities
Real Estate Properties [Line Items]
Total cash proceeds	$ 25,000
Amount of gain (loss) from sale of facilities	11,000
Loans Receivable, Net	39,700
Carrying amount of facility, operating	62,000
Closing cost					5,000
Assumption of HUD mortgages	53,000
Total proceeds	$ 78,000
17 Facilities
Real Estate Properties [Line Items]
Provision for impairment on real estate properties			$ 35,700
23 Facilities
Real Estate Properties [Line Items]
Provision for impairment on real estate properties				45,300
Recorded investment properties after impairments				23,400
34 Facilities
Real Estate Properties [Line Items]
Total cash proceeds				219,300
Amount of gain (loss) from sale of facilities				55,700
35 Facilities
Real Estate Properties [Line Items]
Provision for impairment on real estate properties					35,000
Recorded investment properties after impairments					14,800
37 Facilities
Real Estate Properties [Line Items]
Provision for impairment on real estate properties						99,100
Recorded investment properties after impairments						125,100
Wrote off associated with the termination project						$ 2,600
Number of operator \| item						2
52 Facilities
Real Estate Properties [Line Items]
Total cash proceeds						$ 257,800
Amount of gain (loss) from sale of facilities						53,900
Deferred gain (loss) on sale of loans		$ 10,000				$ 10,000
78 Facilities
Real Estate Properties [Line Items]
Total cash proceeds					309,600
Amount of gain (loss) from sale of facilities					$ 24,800
2 Facilities with Damages
Real Estate Properties [Line Items]
Impairment offset by insurance recovery				$ 3,700
Skilled Nursing Facilities
Real Estate Properties [Line Items]
Number of real estate properties \| facility			784	784	12
Facilities Sold
Real Estate Properties [Line Items]
Number of real estate properties \| facility					78	52
Facilities Sold \| 11 Facilities
Real Estate Properties [Line Items]
Number of real estate properties \| facility			11	11
Facilities Sold \| 34 Facilities
Real Estate Properties [Line Items]
Number of real estate properties \| facility			34	34
Facilities Sold \| 78 Facilities
Real Estate Properties [Line Items]
Number of real estate properties \| facility	12
Facilities Sold \| Skilled Nursing Facilities
Real Estate Properties [Line Items]
Number of real estate properties \| facility					1
Carrying amount of facility					$ 15,400
Total proceeds					$ 15,400
Facilities Sold Previously Held-for-Sale [Member] \| 11 Facilities
Real Estate Properties [Line Items]
Number of real estate properties \| facility			3	3
Facilities Sold Previously Held-for-Sale [Member] \| 34 Facilities
Real Estate Properties [Line Items]
Number of real estate properties \| facility			1	1
Facilities Sold Previously Held-for-Sale [Member] \| 52 Facilities
Real Estate Properties [Line Items]
Number of real estate properties \| facility						14
Facilities Sold Previously Held-for-Sale [Member] \| 78 Facilities
Real Estate Properties [Line Items]
Number of real estate properties \| facility					22
Facilities Classified to Asset Held for Sale [Member] \| 17 Facilities
Real Estate Properties [Line Items]
Number of real estate properties \| facility			5	5
Facilities Classified to Asset Held for Sale [Member] \| 23 Facilities
Real Estate Properties [Line Items]
Real estate investments - net			$ 4,600	$ 4,600
Facilities Classified to Asset Held for Sale [Member] \| 35 Facilities
Real Estate Properties [Line Items]
Recorded investment properties after impairments					$ 1,000
Facilities With Impairment Charges [Member] \| 17 Facilities
Real Estate Properties [Line Items]
Number of real estate properties \| facility			17	17
Facilities With Impairment Charges [Member] \| 23 Facilities
Real Estate Properties [Line Items]
Number of real estate properties \| facility			23	23
Facilities With Impairment Charges [Member] \| 35 Facilities
Real Estate Properties [Line Items]
Number of real estate properties \| facility					35
Facilities With Impairment Charges [Member] \| 37 Facilities
Real Estate Properties [Line Items]
Number of real estate properties \| facility						37
Facilities That Incurred Damages [Member]
Real Estate Properties [Line Items]
Number of real estate properties \| facility			2	2
Facilities That Incurred Damages [Member] \| 35 Facilities
Real Estate Properties [Line Items]
Impairment offset by insurance recovery					$ 5,200
Facilities Did Not Qualify For Sale Accounting Under Full Accrual Method [Member] \| 10 Facilities
Real Estate Properties [Line Items]
Number of real estate properties \| facility						10
Amount of gain (loss) from sale of facilities						$ 17,500
Closing cost						2,600
Carrying amount of facility						23,200
Total proceeds						$ 43,300
Facilities Did Not Qualify For Sale Accounting Under Full Accrual Method [Member] \| 52 Facilities
Real Estate Properties [Line Items]
Number of real estate properties \| facility						10