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Noncontrolling Interest - Summary (Details) - $ / shares
9 Months Ended 12 Months Ended
Jan. 08, 2020
Sep. 30, 2020
Dec. 31, 2019
Jan. 01, 2020
Dec. 31, 2018
Limited Partner          
Noncontrolling interest          
Noncontrolling interest ownership percentage   2.20% 2.50%   3.50%
LTIP Units          
Noncontrolling interest          
stag_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageGrantDateFairValue   $ 23.49   $ 21.64  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 29.47 29.47      
stag_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsConvertedWeightedAverageGrantDateFairValue   $ 18.27      
Noncontrolling Interest - Unit holders in Operating Partnership          
Noncontrolling interest          
Units outstanding, balance at beginning of period (in units)   3,736,852 4,069,434    
Granted/Issued   278,806 364,173    
Forfeited   0 16,618    
Conversions from LTIP units to Other Common Units   0 0    
Redemptions from Other Common Units to common stock   730,104 680,137    
Units outstanding, balance at end of period (in units)   3,285,554 3,736,852    
LTIP Units | Noncontrolling Interest - Unit holders in Operating Partnership          
Noncontrolling interest          
Units outstanding, balance at beginning of period (in units)   1,697,358 1,616,200    
Granted/Issued   278,806 364,173    
Forfeited   0 16,618    
Conversions from LTIP units to Other Common Units   283,741 266,397    
Redemptions from Other Common Units to common stock   0 0    
Units outstanding, balance at end of period (in units)   1,692,423 1,697,358    
Other Common Units | Noncontrolling Interest - Unit holders in Operating Partnership          
Noncontrolling interest          
Units outstanding, balance at beginning of period (in units)   2,039,494 2,453,234    
Granted/Issued   0 0    
Forfeited   0 0    
Conversions from LTIP units to Other Common Units   283,741 266,397    
Redemptions from Other Common Units to common stock   730,104 680,137    
Units outstanding, balance at end of period (in units)   1,593,131 2,039,494