Subsequent Events (Details)
1 Months Ended 12 Months Ended
Jan. 23, 2018
USD ($)
Jan. 22, 2018
USD ($)
Jan. 16, 2018
USD ($)
Jan. 31, 2018
USD ($)
Property
Dec. 31, 2017
USD ($)
Nov. 30, 2014
USD ($)
Master Trust Notes            
Subsequent Event [Line Items]            
Aggregate principal amount of debt         $ 674,400,000 $ 510,000,000
Series 2017-1 Class B | Master Trust Notes            
Subsequent Event [Line Items]            
Aggregate principal amount of debt         $ 132,000,000.0  
Stated interest rate         6.35%  
Maturity         4 years 11 months 19 days  
Shopko | Shopko Asset-Backed Lending Facility            
Subsequent Event [Line Items]            
Lending facility         $ 784,000,000  
Spirit Realty, Inc. | Series 2017-1 Class B | Master Trust Notes            
Subsequent Event [Line Items]            
Aggregate principal amount of debt         $ 6,600,000  
Subsequent Event            
Subsequent Event [Line Items]            
Written notice term     60 days      
Deferred rent, period (up to)     3 months      
Deferred rent, interest rate     0.11      
Subsequent Event | Five Underperforming Properties            
Subsequent Event [Line Items]            
Number of properties disposed | Property       5    
Net book value of properties disposed       $ 12,400,000    
Amount of extinguishment of debt       $ 33,600,000    
Subsequent Event | Series 2017-1 Class B | Master Trust Notes            
Subsequent Event [Line Items]            
Stated interest rate 5.49%          
Additional debt proceeds $ 8,200,000          
Subsequent Event | Societe Generale And Barclays Bank PLC | Non-Recourse CMBS Loan Agreement | Loans Payable            
Subsequent Event [Line Items]            
Maturity   10 years        
Additional debt proceeds   $ 84,000,000        
Subsequent Event | Societe Generale And Barclays Bank PLC | Non-Recourse CMBS Loan Agreement | Loans Payable | 10-year Mid-Market Swap Rate            
Subsequent Event [Line Items]            
Basis spread on variable rate   245.00%        
Subsequent Event | B-1 Term Loan | Operating Partnership And Several Banks Syndicate | B-1 Term Loan            
Subsequent Event [Line Items]            
Aggregate principal amount of debt     $ 35,000,000.0      
Stated interest rate     12.00%      
Principal installments     $ 600,000      
Commitment fee, percentage     3.00%