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Real Estate and Lending Activities - Post Acute Transaction - Additional Information (Detail)
$ in Millions
Mar. 31, 2017
USD ($)
Jun. 17, 2016
USD ($)
May 23, 2016
USD ($)
Property
Business Acquisition [Line Items]      
Proceeds from sale of real estate $ 64.0    
Gain on real estate dispositions $ 7.4    
Post Acute [Member]      
Business Acquisition [Line Items]      
Number of properties sold | Property     5
Outstanding loans paid in full     $ 4.0
Proceeds from sale of real estate   $ 28.0 71.0
Gain on real estate dispositions     $ 15.0
Post Acute [Member] | Texas [Member]      
Business Acquisition [Line Items]      
Number of properties sold | Property     3
Post Acute [Member] | Louisiana [Member]      
Business Acquisition [Line Items]      
Number of properties sold | Property     2