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Use of Derivative Financial Instruments - FV of Interest Rate Swaps (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Fair value of the interest rate swaps outstanding    
Fair value - assets $ 111,000us-gaap_InterestRateDerivativeAssetsAtFairValue $ 959,000us-gaap_InterestRateDerivativeAssetsAtFairValue
Unsecured Debt Swaps (4,037,000)us-gaap_InterestRateDerivativeLiabilitiesAtFairValue (873,000)us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
Unsecured Debt Swaps | Interest Rate Swaps    
Fair value of the interest rate swaps outstanding    
Notional amount assets 125,000,000us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= stag_InterestRateUnsecuredDebtSwapMember
125,000,000us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= stag_InterestRateUnsecuredDebtSwapMember
Fair value - assets 111,000us-gaap_InterestRateDerivativeAssetsAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= stag_InterestRateUnsecuredDebtSwapMember
959,000us-gaap_InterestRateDerivativeAssetsAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= stag_InterestRateUnsecuredDebtSwapMember
Notional amount liabilities 175,000,000us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= stag_InterestRateUnsecuredDebtSwapMember
100,000,000us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= stag_InterestRateUnsecuredDebtSwapMember
Unsecured Debt Swaps $ (4,037,000)us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= stag_InterestRateUnsecuredDebtSwapMember
$ (873,000)us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= stag_InterestRateUnsecuredDebtSwapMember
Number of interest rate swaps with no current notional amount 4stag_NumberOfInterestRateSwapsWithNoNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentRiskAxis
= stag_InterestRateUnsecuredDebtSwapMember