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Summary of Significant Accounting Policies - Revenue Recognition (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
sqft
Mar. 31, 2014
Dec. 17, 2014
sqft
Revenue Recognition      
Estimated amount of real estate taxes, which are the responsibility of tenants $ 2.5stag_RealEstateTaxesTenantResponsibility $ 2.5stag_RealEstateTaxesTenantResponsibility  
Area (in square feet) 48,500,000us-gaap_AreaOfRealEstateProperty    
Belfast, ME      
Revenue Recognition      
Area (in square feet)     90,051us-gaap_AreaOfRealEstateProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= stag_BelfasMember
Square feet terminated under amendment effective November 30, 2015     228,928stag_AreaOfRealEstatePropertyTerminated
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= stag_BelfasMember
Termination fee payable by tenant     2.1stag_LeaseTerminationFeePayableByTenant
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= stag_BelfasMember
Belfast, ME | Rental income      
Revenue Recognition      
Lease termination fee income $ 0.5stag_OperatingLeasesIncomeStatementLeaseTerminationRevenue
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= stag_BelfasMember