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Commercial Mortgage Loan Portfolio (Detail) (Commercial mortgage loans [Member], USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount $ 374,000 $ 164,000
Current Face Amount 371,938 161,600
Carrying Value 369,924 161,099
Coupon rate of loan 7.95% 8.82%
Hotel [Member] | Hotel - NY, NY [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount 32,000 32,000
Current Face Amount 31,115 31,317
Carrying Value 31,115 31,317
Property Size, Number of Units/Rooms 151 151
Hotel [Member] | Hotel - Silver Spring, MD [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount 26,000 26,000
Current Face Amount 24,684 24,947
Carrying Value 24,617 24,785
Property Size, Number of Units/Rooms 263 263
Hotel [Member] | Hotel - Philadelphia, PA [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount 34,000  
Current Face Amount 34,000  
Carrying Value 33,775  
Property Size, Number of Units/Rooms 301  
Office Condo [Member] | Office Condo (Headquarters) - NY, NY [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount 28,000 28,000
Current Face Amount 26,968 27,169
Carrying Value 26,968 27,169
Property Size, Area 73,419 73,419
Condo Conversion [Member] | Condo Conversion - NY, NY December 2012 [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount 45,000 45,000
Current Face Amount 45,496 45,000
Carrying Value 45,781 44,867
Property Size, Area 119,000 119,000
Condo Conversion [Member] | Condo Conversion - NY, NY August 2013 [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount 33,000 33,000
Current Face Amount 33,675 33,167
Carrying Value 33,691 32,961
Property Size, Area 40,000 40,000
Condo Construction [Member] | Condo Construction Potomac, MD [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount 25,000  
Current Face Amount 25,000  
Carrying Value 24,436  
Property Size, Number of Units/Rooms 50  
Condo Construction [Member] | Vacation Home Portfolio - Various [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount 101,000  
Current Face Amount 101,000  
Carrying Value 100,018  
Number of properties 229  
Condo Construction [Member] | Condo Construction Bethesda, MD [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount 20,000  
Current Face Amount 20,000  
Carrying Value 19,497  
Property Size, Number of Units/Rooms 40  
Condo Construction [Member] | Multifamily - Brooklyn, NY [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount 30,000  
Current Face Amount 30,000  
Carrying Value $ 30,026  
Property Size, Number of Units/Rooms 63