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Concentration of Risk - Additional Information (Detail)
$ in Thousands
12 Months Ended
Oct. 01, 2015
USD ($)
renewal_option
facility
Dec. 31, 2016
USD ($)
facility
bed
state
tenant
Dec. 31, 2015
USD ($)
tenant
Dec. 31, 2014
USD ($)
tenant
Concentration Risk [Line Items]        
Number of major tenants | tenant   1 1 1
Description of highest concentration of properties   The four states in which Ensign leases the highest concentration of properties are California, Texas, Utah and Arizona.    
Rental income | $   $ 93,126 $ 65,979 $ 51,367
Premier Senior Living, LLC [Member]        
Concentration Risk [Line Items]        
Properties subject to operating lease   16    
Rental income | $   $ 18,600    
Escalation factor for calculating revenues after year two   3.00%    
Liberty Healthcare Portfolio [Member]        
Concentration Risk [Line Items]        
Number of facilities acquired 14      
Acquisition consideration | $ $ 176,500      
Liberty Healthcare Portfolio [Member] | Pristine Master Lease [Member]        
Concentration Risk [Line Items]        
Properties subject to operating lease   16    
Leases period 15 years      
Leases renewal options | renewal_option 2      
Leases renewal term 5 years      
Rental income | $   $ 18,600    
Escalation factor for calculating revenues after year two 0.00%      
Percentage change in the consumer price index 3.00%      
Assets Leased to Ensign [Member] | Skilled Nursing, Assisted Living and Independent Living Facilities [Member]        
Concentration Risk [Line Items]        
Number of living facilities   151    
Number of units available in living facilities | bed   14,919    
Ensign [Member]        
Concentration Risk [Line Items]        
Number of states where Ensign leases the highest concentration of properties | state   4    
Ensign [Member] | Assets Leased to Ensign [Member] | Skilled Nursing, Assisted Living and Independent Living Facilities [Member]        
Concentration Risk [Line Items]        
Number of living facilities   93    
Number of units available in living facilities | bed   9,916    
Revenue [Member]        
Concentration Risk [Line Items]        
Tenant description   The Company has one major tenant, Ensign