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Debt Securities - Additional Information (Detail)
$ in Thousands
1 Months Ended 3 Months Ended
Feb. 28, 2015
USD ($)
Aug. 31, 2014
USD ($)
option
May. 31, 2014
USD ($)
ft²
room
casino
timeshare_unit
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Jun. 30, 2014
USD ($)
Mortgage Loans on Real Estate [Line Items]              
Realized gain (loss) on sale of securities       $ 0 $ (443)    
Subordinate Mortgage Loans [Member]              
Mortgage Loans on Real Estate [Line Items]              
Mortgage loan, face amount       $ 966,164   $ 964,955  
Hotel [Member] | Subordinate Mortgage Loans [Member] | Hotel - Aruba [Member]              
Mortgage Loans on Real Estate [Line Items]              
Property Size, Number of Units/Rooms | room     442        
Number of timeshare units in real estate property | timeshare_unit     114        
Number of casinos in real estate property | casino     2        
Property Size, Area (in square feet) | ft²     131,500        
Term of loan   3 years          
Number of options to extend loan agreement | option   2          
Option to extend loan agreement, term   1 year          
Appraised loan to value ratio   60.00%          
First Mortgage [Member] | Hotel [Member] | Subordinate Mortgage Loans [Member] | Hotel - Aruba [Member]              
Mortgage Loans on Real Estate [Line Items]              
Mortgage loan, face amount     $ 155,000        
Senior Participation [Member] | Hotel [Member] | Subordinate Mortgage Loans [Member] | Hotel - Aruba [Member]              
Mortgage Loans on Real Estate [Line Items]              
Participation in loan, amount   $ 90,000         $ 90,000
Junior Participation [Member] | Hotel [Member] | Subordinate Mortgage Loans [Member] | Hotel - Aruba [Member]              
Mortgage Loans on Real Estate [Line Items]              
Participation in loan, amount   $ 65,000         $ 65,000
Commercial Mortgage Backed Securities [Member]              
Mortgage Loans on Real Estate [Line Items]              
Amortized cost of debt securities sold $ 24,038            
Realized gain on sale of debt securities 43            
Realized loss on sale of debt securities 486            
Reclassification out of accumulated other comprehensive income 678            
Proceeds from sale of debt securities, net of debt facility repayment 1,341            
Line of Credit [Member] | Wells Fargo [Member]              
Mortgage Loans on Real Estate [Line Items]              
Repayment of debt facility $ 22,254