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Real Estate and Loans Receivable - Disposals - Additional Information (Detail)
$ in Thousands
12 Months Ended
Mar. 31, 2017
USD ($)
Aug. 05, 2015
USD ($)
Hospital
Jul. 30, 2015
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]            
Proceeds from sale of facilities $ 64,000          
Gain on real estate dispositions 7,400          
Gain offset by non-cash charges $ 600          
Proceeds from sale of real estate       $ 64,362 $ 198,767 $ 19,175
Texas [Member]            
Debt Instrument [Line Items]            
Proceeds from sale of real estate     $ 9,700      
Gain (loss) on sale of real estate     1,500      
Straight line rent receivables write-off     $ 900      
United States [Member]            
Debt Instrument [Line Items]            
Proceeds from sale of real estate   $ 9,500        
Number of hospitals sold | Hospital   6        
Gain (loss) on sale of real estate   $ 1,700        
Consideration received as note receivable   1,500        
Billed rent receivables write-off   $ 900        
Amortization of the related lease intangible asset       $ 700