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Other Assets and Liabilities - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Location
Mar. 31, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Location
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Location
Other Assets and Other Liabilities [Line Items]            
Real estate owned (REO) $ 6,493     $ 6,493   $ 4,896
Amount related to transfers into REO       6,000    
REO liquidations       6,000    
Unrealized loss resulting from market valuation adjustments on REO       1,000    
Restructuring charges (118) $ 11,000 $ 0 10,541 $ 0  
Adjustments in restructuring $ 0     $ (3,486)    
Sequoia            
Other Assets and Other Liabilities [Line Items]            
Number of REO properties recorded on balance sheet | Location 22     22   23
Termination Benefits            
Other Assets and Other Liabilities [Line Items]            
Restructuring charges $ 55 9,000   $ 8,793    
Adjustments in restructuring 0 (3,000)   (3,486)    
Contract Termination Costs            
Other Assets and Other Liabilities [Line Items]            
Restructuring charges (173) $ 2,000   1,748    
Adjustments in restructuring $ 0     $ 0