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Participations Sold (Detail)
1 Months Ended
Jan. 31, 2015
USD ($)
facility
Feb. 28, 2015
USD ($)
Feb. 28, 2015
GBP (£)
Jan. 31, 2015
GBP (£)
Aug. 31, 2014
USD ($)
Jun. 30, 2014
USD ($)
May 31, 2014
USD ($)
Commercial Mortgage Portfolio Segment [Member] | Mezzanine Loan, Acquired by Investment Funds [Member]              
Mortgage Loans on Real Estate [Line Items]              
Mortgage loan, face amount   $ 30,672,000 £ 20,000,000        
Hotel [Member] | Hotel - Aruba [Member] | Subordinate Mortgage Portfolio Segment [Member] | First Mortgage [Member]              
Mortgage Loans on Real Estate [Line Items]              
Mortgage loan, face amount             $ 155,000,000
Senior Participation [Member] | Hotel [Member] | Hotel - Aruba [Member] | Subordinate Mortgage Portfolio Segment [Member]              
Mortgage Loans on Real Estate [Line Items]              
Participation in loan, amount         $ 90,000,000 $ 90,000,000  
Junior Participation [Member] | Hotel [Member] | Hotel - Aruba [Member] | Subordinate Mortgage Portfolio Segment [Member]              
Mortgage Loans on Real Estate [Line Items]              
Participation in loan, amount         $ 65,000,000 $ 65,000,000  
United Kingdom [Member] | Senior Housing Facility [Member] | Commercial Mortgage Portfolio Segment [Member] | Mezzanine Loan [Member]              
Mortgage Loans on Real Estate [Line Items]              
Mortgage loan, face amount $ 51,996,000     £ 34,519,000      
Number of properties | facility 44