Consolidated Balance Sheets (Parenthetical) - $ / shares
Sep. 30, 2020
Dec. 31, 2019
Stockholders’ equity:    
Preferred stock, par value (in USD per share) $ 0.01 $ 0.01
Preferred stock, shares authorized 20,000,000 20,000,000
Preferred stock, shares issued 6,900,000 6,900,000
Preferred stock, shares outstanding 6,900,000 6,900,000
Common stock, par value per share (in USD per share) $ 0.05 $ 0.05
Common stock, shares authorized 175,000,000 175,000,000
Common stock, shares issued 105,884,703 102,476,152
Common stock, shares outstanding 105,884,703 102,476,152
Spirit Realty, L.P. | General Partner's Capital    
Partnership units    
General partners' capital, units issued 797,644 797,644
General partners' capital, units outstanding [1] 797,644 797,644
Spirit Realty, L.P. | Limited Partners' Capital    
Partnership units    
Limited partners' common capital, units issued 105,087,059 101,678,508
Limited partners' common capital, units outstanding [2] 105,087,059 101,678,508
Spirit Realty, L.P. | Limited Partners' Capital | Limited Partner Series A Preferred Units    
Partnership units    
Limited partners' preferred capital, units issued 6,900,000 6,900,000
Limited partners' preferred capital, units outstanding [2] 6,900,000 6,900,000
[1] Consists of general partnership interests held by OP Holdings.
[2] Consists of limited partnership interests held by the Corporation and Spirit Notes Partner, LLC.