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Subsequent Events (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2012
February Subsequent Event [Member]
Integer
Y
Feb. 02, 2012
February Subsequent Event [Member]
Integer
Subsequent Event [Line Items]          
Number of facilities purchased or sold         9
Aggregate purchase price $ 13,990,000 $ 660,000 $ 1,246,000 $ 121,300,000  
Debt         77,900,000
Number of communities securing debt (in number of communities)       7  
Term of debt (in years)       10  
Percentage of loans bearing interest at a fixed rate (in hundredths)         75.00%
Fixed interest rate (in hundredths)         4.20%
Percentage of loans bearing interest at a variable rate (in hundredths)         25.00%
Description of variable rate basis      
30 day LIBOR plus a margin of 276 basis points
  
Debt Instrument, Basis Spread on Variable Rate         2.76%
Seller financing         $ 15,000,000
Number of communities securing seller financing (in number of communities)       2  
Term of seller financing (in years)       2  
Seller financing fixed interest rate (in hundreths)         7.00%