XML 31 R28.htm IDEA: XBRL DOCUMENT v2.4.1.9
Organization and Description of Business (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Real estate properties    
Number of properties 253us-gaap_NumberOfRealEstateProperties  
Number of states in which the entity owned buildings 36us-gaap_NumberOfStatesInWhichEntityOperates  
Area (in square feet) 48,500,000us-gaap_AreaOfRealEstateProperty  
Percentage of buildings leased to tenants 94.40%stag_PercentagePropertyLeasedToTenant  
Number of tenants 231stag_NumberOfTenants  
Warehouse - Distribution buildings    
Real estate properties    
Number of properties 183us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= stag_WarehouseAndDistributionBuildingsMember		  
Light Manufacturing buildings    
Real estate properties    
Number of properties 50us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_IndustrialPropertyMember		  
Flex - Office buildings    
Real estate properties    
Number of properties 20us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= stag_FlexibleUseBuildingsMember		  
Land    
Real estate properties    
Number of properties 3us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_LandMember		  
STAG Industrial Operating Partnership, L.P.    
Real estate properties    
Ownership interest in Operating Partnership (as a percent) 94.93%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
/ us-gaap_RealEstatePropertiesAxis
= stag_STAGIndustrialOperatingPartnershipMember		 96.36%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
/ us-gaap_RealEstatePropertiesAxis
= stag_STAGIndustrialOperatingPartnershipMember