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CONCENTRATION OF RISK (Narrative) (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
state
item
facility
property
Dec. 31, 2017
USD ($)
facility
property
Jun. 30, 2018
facility
Sep. 30, 2017
facility
Dec. 31, 2016
facility
property
Sep. 30, 2016
facility
Jun. 30, 2016
facility
Concentration Risk [Line Items]              
Number of real estate properties 924            
Number of states | state 41            
Number of operators | item 68            
Gross investment in facilities, net of impairments and reserves for uncollectible loans | $ $ 8,600,000            
Number of facility held for sale | property 3 22     20    
Percentage Of Real Estate Investment 99.00%            
Number of facilities held-for-sale/closed 4            
Other investments | $ $ 504,626 $ 276,342          
Investment in unconsolidated joint venture | $ $ 31,045 $ 36,516          
Skilled Nursing Facilities              
Concentration Risk [Line Items]              
Number of real estate properties 12 31     70    
Number of facilities under fixed rate mortgage loan 51            
Skilled Nursing Facilities | Wholly Owned Properties [Member]              
Concentration Risk [Line Items]              
Number of real estate properties 735            
Skilled Nursing Facilities | Ohio              
Concentration Risk [Line Items]              
Number of real estate properties 1         1  
Skilled Nursing Facilities | Texas              
Concentration Risk [Line Items]              
Number of real estate properties   6 5        
Assisted Living Facilities              
Concentration Risk [Line Items]              
Number of real estate properties 3 20     20    
Number of facilities under fixed rate mortgage loan 3            
Assisted Living Facilities | Wholly Owned Properties [Member]              
Concentration Risk [Line Items]              
Number of real estate properties 116            
Assisted Living Facilities | Florida              
Concentration Risk [Line Items]              
Number of real estate properties           1  
Assisted Living Facilities | Texas              
Concentration Risk [Line Items]              
Number of real estate properties       1     3
Specialty              
Concentration Risk [Line Items]              
Number of real estate properties 14            
Medical Office Building              
Concentration Risk [Line Items]              
Number of real estate properties 1            
Geographic Concentration Risk [Member] | Florida              
Concentration Risk [Line Items]              
Concentration percentage 10.00%            
Geographic Concentration Risk [Member] | Texas              
Concentration Risk [Line Items]              
Concentration percentage 10.00%            
Geographic Concentration Risk [Member] | Michigan              
Concentration Risk [Line Items]              
Concentration percentage 8.00%            
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Ciena Healthcare              
Concentration Risk [Line Items]              
Concentration percentage 11.00% 10.00%