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Noncontrolling Interest - Summary (Details) - $ / shares
3 Months Ended 6 Months Ended
Jan. 08, 2020
Mar. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Jan. 01, 2020
Dec. 31, 2019
Dec. 31, 2018
Limited Partner              
Noncontrolling interest              
Noncontrolling interest ownership percentage     2.30%     2.50% 3.50%
LTIP Units              
Noncontrolling interest              
stag_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageGrantDateFairValue     $ 23.19   $ 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     $ 18.72        
Noncontrolling Interest - Unit holders in Operating Partnership              
Noncontrolling interest              
Units outstanding, balance at beginning of period (in units)   3,736,852 3,736,852 4,069,434      
Granted/Issued   364,173 278,806        
Forfeited   16,618 0        
Conversions from LTIP units to Other Common Units   0 0        
Redemptions from Other Common Units to common stock   680,137 447,730        
Units outstanding, balance at end of period (in units)     3,567,928        
LTIP Units | Noncontrolling Interest - Unit holders in Operating Partnership              
Noncontrolling interest              
Units outstanding, balance at beginning of period (in units)   1,697,358 1,697,358 1,616,200      
Granted/Issued   364,173 278,806        
Forfeited   16,618 0        
Conversions from LTIP units to Other Common Units   266,397 197,775        
Redemptions from Other Common Units to common stock   0 0        
Units outstanding, balance at end of period (in units)     1,778,389        
Other Common Units | Noncontrolling Interest - Unit holders in Operating Partnership              
Noncontrolling interest              
Units outstanding, balance at beginning of period (in units)   2,039,494 2,039,494 2,453,234      
Granted/Issued   0 0        
Forfeited   0 0        
Conversions from LTIP units to Other Common Units   266,397 197,775        
Redemptions from Other Common Units to common stock   680,137 447,730        
Units outstanding, balance at end of period (in units)     1,789,539