Debt - Master Trust Notes - Narrative (Details) (USD $)
0 Months Ended 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
May 20, 2014
New Notes
Mortgages
Sep. 30, 2014
Master Funding Notes
Property
Sep. 30, 2014
Master Funding Notes
Mortgages
Property
Sep. 30, 2014
Net-lease Mortgage Notes
Spirit Master Funding VII, LLC
Property
Dec. 31, 2013
Net-lease Mortgage Notes
Spirit Master Funding VII, LLC
Sep. 30, 2014
Net-lease Mortgage Notes
Mortgages
Spirit Master Funding VII, LLC
Property
Dec. 31, 2013
3.89% Series 2013-1 Class A Interest Only
Spirit Master Funding VII, LLC
Dec. 31, 2013
5.27% Series 2013-2 Class A Amortizing Net Lease Mortgage Notes
Spirit Master Funding VII, LLC
Sep. 30, 2014
Weighted Average
Sep. 30, 2014
Weighted Average
Mortgages
Sep. 30, 2014
Weighted Average
Master Funding Notes
Sep. 30, 2014
Weighted Average
Net-lease Mortgage Notes
Spirit Master Funding VII, LLC
Debt Instrument [Line Items]                            
Extended term of debt     17 years                      
Long-term debt $ 4,007,828,000 $ 3,778,218,000   $ 877,800,000   $ 327,000,000                
Number of properties securing borrowings       714 82 316   77            
Weighted average interest rate       5.58%   4.74%                
Weighted Average Maturity                     4 years 8 months 16 days [1] 6 years 9 months 7 days [1] 6 years 6 months 29 days 7 years 3 months 22 days
Aggregate principal amount of debt             $ 330,000,000   $ 125,000,000.0 $ 205,000,000.0        
Weighted average stated interest rate                 3.89% 5.27% 5.06% [2] 5.35% [2]    
[1] Represents the weighted average maturity based on the outstanding principal balance as of September 30, 2014.
[2] Represents the weighted average stated interest rate based on the outstanding principal balance as of September 30, 2014.