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Concentration of Credit Risk - Additional Information (Detail)
12 Months Ended
Dec. 31, 2012
Leases Disclosure [Line Items]  
Percentage of rental income from operating leases 100.00%
Customer Concentration Risk
 
Leases Disclosure [Line Items]  
Rent from tenant of Primrose I communities and Primrose II communitie as a percentage of total revenue 93.80%