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Borrowings (Detail) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 12, 2016
Aug. 31, 2013
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Repurchase Agreement Counterparty            
Collateral ratio       111.00% 112.00%  
Due from counterparties       $ 110,009,000 $ 57,604,000  
Proceeds from issuance of debt       $ 0 0 $ 400,000,000
Exchangeable Senior Notes            
Repurchase Agreement Counterparty            
Aggregate principal balance     $ 400,000,000     $ 400,000,000
Proceeds from issuance of debt     $ 387,700,000      
Debt instrument, percentage       5.00%    
First interest payment date       Sep. 15, 2013    
Exchange rate for each $1,000 aggregate principal amount       0.0420893    
Common stock, exchange price per share       $ 23.76    
Number of shares registered for resale prospectus   605,034        
Accrued interest payable on notes       $ 5,900,000 5,900,000  
Repurchase Agreements            
Repurchase Agreement Counterparty            
Due from counterparties       $ 710,000 $ 0  
Minimum            
Repurchase Agreement Counterparty            
Repurchase obligation maturity (in months)       1 month    
Maximum            
Repurchase Agreement Counterparty            
Repurchase obligation maturity (in months)       12 months    
Maximum | Exchangeable Senior Notes            
Repurchase Agreement Counterparty            
Exchange rate for each $1,000 aggregate principal amount       0.0484027    
Common stock, exchange price per share       $ 20.66    
Federal Home Loan Bank of Indianapolis            
Repurchase Agreement Counterparty            
Outstanding secured advances from FHLBI       $ 1,650,000,000    
Average outstanding borrowings from FHLBI       $ 1,600,000,000    
FHLBI weighted average interest rate on advances       0.41%    
FHLBI weighted average maturity of advances (in years)       8 years 18 days    
Federal Home Loan Bank of Indianapolis | CMBS            
Repurchase Agreement Counterparty            
Collateral pledged against secured loans       $ 1,400,000,000    
Federal Home Loan Bank of Indianapolis | Agency RMBS            
Repurchase Agreement Counterparty            
Collateral pledged against secured loans       $ 558,900,000    
Subsequent Event            
Repurchase Agreement Counterparty            
Permitted duration IAS may remain a member of FHLB (in years) 5 years