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Subsequent Events (Detail)
 1 Months Ended
Jul. 03, 2017
$ / shares
shares
Aug. 01, 2017
USD ($)
Jul. 31, 2017
USD ($)
Security
Aug. 01, 2017
GBP (£)
Jun. 30, 2017
shares
Dec. 31, 2016
shares
Subsequent Event [Member]            
Subsequent Event [Line Items]            
Number of CMBS | Security     2      
Loan fundings   $ 2,900,000        
Proceeds from loan repayments   50,400,000        
Series A Preferred stock [Member]            
Subsequent Event [Line Items]            
Preferred stock, shares issued (in shares) | shares         3,450,000 3,450,000
Preferred stock, shares outstanding (in shares) | shares         3,450,000 3,450,000
Series A Preferred stock [Member] | Subsequent Event [Member]            
Subsequent Event [Line Items]            
Preferred stock, shares issued (in shares) | shares 3,450,000,000          
Preferred stock, shares outstanding (in shares) | shares 3,450,000          
Redemption price (in dollars per share) | $ / shares $ 25.00          
Unpaid dividends (in dollars per share) | $ / shares $ 0.1079          
CMBS [Member] | Subsequent Event [Member]            
Subsequent Event [Line Items]            
Proceeds from sale and principal pay downs     $ 60,000,000      
Commercial Mortgage Portfolio Segment [Member] | Subsequent Event [Member]            
Subsequent Event [Line Items]            
Total loans, held for investment, net   125,000,000   £ 60,000,000    
Loan fundings   125,000,000   £ 32,190,000    
Subordinate Mortgage Portfolio Segment [Member] | Subsequent Event [Member]            
Subsequent Event [Line Items]            
Total loans, held for investment, net   37,500,000        
Loan fundings   $ 37,500,000