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Other Real Estate Investments - Additional Information (Detail)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Dec. 31, 2014
USD ($)
a
bed
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Real Estate Properties [Line Items]        
Preferred equity investment   $ 9.0   $ 9.0
Recognized interest income   $ 0.3 $ 0.2 $ 0.5
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%