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Other Real Estate Investments - Additional Information (Detail)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
bed
Jul. 31, 2016
USD ($)
bed
Dec. 31, 2014
USD ($)
a
bed
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Real Estate Properties [Line Items]              
Preferred equity investment $ 13.6     $ 13.6   $ 13.6  
Recognized interest income       0.1 $ 0.3 0.6 $ 0.7
Signature Senior Living [Member]              
Real Estate Properties [Line Items]              
Preferred equity investment     $ 7.5        
Return from preferred equity investment     12.00%        
Number of beds planned for construction | bed     134        
Area under construction | a     5        
Initial lease yield     8.00%        
Cascadia Development, LLC [Member]              
Real Estate Properties [Line Items]              
Preferred equity investment $ 2.3 $ 2.2   $ 2.3   $ 2.3  
Number of beds planned for construction | bed 99 99          
Initial lease yield 9.00% 9.00%          
Equity method investment minimum yield 12.00% 12.00%          
Cascadia Development, LLC [Member] | Prime Rate [Member]              
Real Estate Properties [Line Items]              
Basis spread of preferred equity investment yield 9.50% 9.50%