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Other Assets and Liabilities - Additional Information (Detail)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
USD ($)
Location
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Location
Other Assets and Other Liabilities [Line Items]      
Guarantee obligations, over-collateralized amount $ 16,000    
Real estate owned (REO) 4,884   $ 4,896
Amount related to transfers into REO 2,000    
REO liquidations 3,000    
Unrealized loss resulting from market valuation adjustments on REO 1,000    
Costs incurred and expensed 10,659 $ 0  
Adjustments in restructuring $ (3,486)    
Sequoia      
Other Assets and Other Liabilities [Line Items]      
Number of REO properties recorded on balance sheet | Location 20   23
Termination Benefits      
Other Assets and Other Liabilities [Line Items]      
Costs incurred and expensed $ 8,738    
Adjustments in restructuring (3,486)    
Contract Termination Costs      
Other Assets and Other Liabilities [Line Items]      
Costs incurred and expensed 1,921    
Adjustments in restructuring $ 0