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Schedule II - Schedule of Valuation and Qualifying Accounts (Parenthetical) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2014
Dec. 31, 2015
Impairment charges $ 7,229 $ 50,128  
Increase (decrease) in valuation allowance (6,900)    
Net deferred tax assets reserve     $ 6,200
Twelve Oaks Facility [Member]      
Rent reserves 1,900    
Write offs related to payment of rent, late fees, and loans 3,300    
Rent and late fee reserves     1,500
Corinth Facility [Member]      
Rent reserves 800    
Write offs for rent and interest reserves 800    
M/C Healthcare Loan [Member]      
Write offs related to loan $ 100    
Healthtrax Properties [Member]      
Rent reserves     $ 500
Monroe Properties [Member]      
Impairment charges   47,000  
Write offs for rent and interest reserves   9,500  
Increase (decrease) in valuation allowance   $ 9,000