Debt - Additional Information - Master Trust Notes (Details)
Dec. 31, 2017
USD ($)
Subsidiary
Property
Nov. 30, 2014
USD ($)
Dec. 31, 2013
USD ($)
Master Trust Notes      
Debt Instrument [Line Items]      
Aggregate principal amount of debt $ 674,400,000 $ 510,000,000  
Series 2014-4 Class A1 | Master Trust Notes      
Debt Instrument [Line Items]      
Aggregate principal amount of debt   $ 150,000,000.0  
Stated interest rate 3.50% 3.50%  
Series 2014-4 Class A2 | Master Trust Notes      
Debt Instrument [Line Items]      
Aggregate principal amount of debt   $ 360,000,000.0  
Stated interest rate 4.60% 4.63%  
Series 2017-1 Class A | Master Trust Notes      
Debt Instrument [Line Items]      
Aggregate principal amount of debt $ 542,400,000    
Stated interest rate 4.36%    
Series 2017-1 Class B | Master Trust Notes      
Debt Instrument [Line Items]      
Aggregate principal amount of debt $ 132,000,000.0    
Stated interest rate 6.35%    
Total Master Trust 2014 notes      
Debt Instrument [Line Items]      
Number of properties securing borrowings | Property 815    
Number of wholly-owned subsidiaries (in properties) | Subsidiary 5    
Total Master Trust 2013 notes      
Debt Instrument [Line Items]      
Number of properties securing borrowings | Property 296    
Spirit Master Funding VII, LLC | Net-lease Mortgage Notes      
Debt Instrument [Line Items]      
Aggregate principal amount of debt     $ 330,000,000.0
Spirit Master Funding VII, LLC | 3.89% Series 2013-1 Class A Interest Only      
Debt Instrument [Line Items]      
Aggregate principal amount of debt     $ 125,000,000.0
Stated interest rate     3.89%
Spirit Master Funding VII, LLC | 5.27% Series 2013-2 Class A Amortizing Net Lease Mortgage Notes      
Debt Instrument [Line Items]      
Aggregate principal amount of debt     $ 205,000,000.0
Stated interest rate     5.27%
Spirit Realty, Inc. | Series 2017-1 Class A | Master Trust Notes      
Debt Instrument [Line Items]      
Aggregate principal amount of debt $ 27,100,000    
Spirit Realty, Inc. | Series 2017-1 Class B | Master Trust Notes      
Debt Instrument [Line Items]      
Aggregate principal amount of debt $ 6,600,000