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Summarized Operating Data of Unconsolidated Entities Income Statement (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2013
Montecito Joint Venture
Apr. 30, 2013
Windsor Manor
Community
Schedule of Equity Method Investments [Line Items]        
Number of senior housing communities acquired       2
Acquisition fees and expenses $ 7,205 $ 578 $ 300