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Commercial Mortgage Loan Portfolio (Detail) (Commercial mortgage loans [Member], USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Mortgage Loans on Real Estate [Line Items]    
Original Face Amount $ 349,000 $ 164,000
Current Face Amount 346,485 161,600
Carrying Value 343,810 161,099
Coupon rate of loan 8.64% 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 31,179 31,317
Carrying Value 31,179 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 24,770 24,947
Carrying Value 24,670 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 33,698  
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 27,032 27,169
Carrying Value 27,032 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 45,000 45,000
Carrying Value 45,142 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 33,504 33,167
Carrying Value 33,442 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 24,320  
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 106,000  
Current Face Amount 106,000  
Carrying Value 104,953  
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 $ 19,374  
Property Size, Number of Units/Rooms 40