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Subsequent Events (Detail)
ft² in Thousands
1 Months Ended 9 Months Ended
Oct. 28, 2016
USD ($)
ft²
healthcare_property
bed
state
story
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Oct. 28, 2016
GBP (£)
Subsequent Event [Line Items]        
Principal payments received on commercial mortgage loans   $ 118,120,000 $ 41,479,000  
Subsequent Event [Member]        
Subsequent Event [Line Items]        
Loans funded, amount $ 6,228,000      
Principal payments received on commercial mortgage loans $ 34,500,000      
Subsequent Event [Member] | Commercial Mortgage Portfolio Segment [Member]        
Subsequent Event [Line Items]        
Extension term of loan 12 months      
Subsequent Event [Member] | Luxury Condominium [Member] | Commercial Mortgage Portfolio Segment [Member]        
Subsequent Event [Line Items]        
Mortgage loan, face amount | £       £ 100,000
Subsequent Event [Member] | First Mortgage [Member] | Data Center [Member] | Commercial Mortgage Portfolio Segment [Member]        
Subsequent Event [Line Items]        
Mortgage loan, face amount $ 80,000,000      
Subsequent Event [Member] | Junior Mezzanine Loan [Member] | Healthcare Properties [Member] | Commercial Mortgage Portfolio Segment [Member]        
Subsequent Event [Line Items]        
Mortgage loan, face amount $ 130,000,000      
Number of properties | healthcare_property 155      
Property size, number of beds | bed 18,662      
Number of states with property in portfolio | state 20      
Subsequent Event [Member] | Preferred Equity Interest [Member] | Condominium [Member] | Commercial Mortgage Portfolio Segment [Member]        
Subsequent Event [Line Items]        
Mortgage loan, face amount $ 30,000,000      
Property size, area (in square feet) | ft² 247      
Mortgage on real estate, number of stories in real estate property | story 30      
Subsequent Event [Member] | Pari Passu Interests in Pre-Development Mezzanine Loan [Member] | Luxury Condominium [Member] | Commercial Mortgage Portfolio Segment [Member]        
Subsequent Event [Line Items]        
Mortgage loan, face amount $ 57,400,000     £ 45,000,000