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Debt Securities - Additional Information (Detail) (Subordinate Mortgage Loans [Member], USD $)
In Thousands, unless otherwise specified
 1 Months Ended 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
May 31, 2014
Hotel [Member]
Hotel - Aruba [Member]
timeshare_unit
sqft
May 31, 2014
Hotel [Member]
Hotel - Aruba [Member]
room
May 31, 2014
Hotel [Member]
Hotel - Aruba [Member]
casino
Sep. 30, 2014
Hotel [Member]
Hotel - Aruba [Member]
option
May 31, 2014
First Mortgage [Member]
Hotel [Member]
Hotel - Aruba [Member]
Aug. 31, 2014
Senior Participation [Member]
Hotel [Member]
Hotel - Aruba [Member]
Jun. 30, 2014
Senior Participation [Member]
Hotel [Member]
Hotel - Aruba [Member]
Aug. 31, 2014
Junior Participation [Member]
Hotel [Member]
Hotel - Aruba [Member]
Jun. 30, 2014
Junior Participation [Member]
Hotel [Member]
Hotel - Aruba [Member]
Mortgage Loans on Real Estate [Line Items]                      
Mortgage loan, face amount $ 580,601 $ 495,319         $ 155,000        
Property Size, Number of Units/Rooms     114 442 2            
Property Size, Area     131,500 131,500 131,500            
Participation in loan, amount               $ 90,000 $ 90,000 $ 65,000 $ 65,000
Term of loan           3 years          
Number of options to extend loan agreement           2          
Option to extend loan agreement, term           1 year          
Appraised loan to value ratio           60.00%