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Schedule II - Schedule of Valuation and Qualifying Accounts (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Increase (decrease) in valuation allowance   $ 4.9 $ (6.1)  
Net deferred tax assets reserve       $ 6.2
Foreign Valuation Allowances [Member]        
Increase (decrease) in valuation allowance $ (4.0)      
Twelve Oaks Facility [Member]        
Rent reserves 1.9   1.9  
Write offs related to payment of rent, late fees, and loans 3.3   3.3  
Rent and late fee reserves       1.5
Corinth Facility [Member]        
Rent reserves 0.8   0.8  
Write offs for rent and interest reserves 0.8   0.8  
M/C Healthcare Loan [Member]        
Write offs related to loan $ 0.1   $ 0.1  
Healthtrax Properties [Member]        
Rent reserves       $ 0.5