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Other Real Estate Investments - Additional Information (Detail)
$ in Millions
1 Months Ended 3 Months Ended
Sep. 30, 2016
USD ($)
bed
Jul. 31, 2016
USD ($)
bed
Dec. 31, 2014
USD ($)
a
bed
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Real Estate Properties [Line Items]          
Preferred equity investment       $ 14.0  
Recognized interest income       $ 0.2 $ 0.3
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      
Number of beds planned for construction | bed 99 99      
Initial lease yield 9.00% 9.00%      
Preferred equity 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%