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Derivatives and Hedging Activities (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Derivatives, Fair Value [Line Items]      
Derivative asset $ 8,775us-gaap_DerivativeAssets $ 9,189us-gaap_DerivativeAssets $ 0us-gaap_DerivativeAssets
Derivative liability     0us-gaap_DerivativeLiabilities
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Deferred Costs and Other Assets, Net [Member]      
Derivatives, Fair Value [Line Items]      
Derivative asset 1,165us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= arcp_DeferredCostsandOtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
0us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= arcp_DeferredCostsandOtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
 
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Deferred Rent, Derivative Liabilities and Other Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Derivative liability (1,235)us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= arcp_DeferredRentDerivativeLiabilitiesandOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
0us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= arcp_DeferredRentDerivativeLiabilitiesandOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
 
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Deferred Costs and Other Assets, Net [Member] | Cash Flow Hedging [Member]      
Derivatives, Fair Value [Line Items]      
Derivative asset 7,610us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= arcp_DeferredCostsandOtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
9,189us-gaap_DerivativeAssets
/ us-gaap_BalanceSheetLocationAxis
= arcp_DeferredCostsandOtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
 
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Deferred Rent, Derivative Liabilities and Other Liabilities [Member] | Cash Flow Hedging [Member]      
Derivatives, Fair Value [Line Items]      
Derivative liability (4,751)us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= arcp_DeferredRentDerivativeLiabilitiesandOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
(1,719)us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= arcp_DeferredRentDerivativeLiabilitiesandOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
 
Series D Preferred Stock Embedded Derivative [Member] | Not Designated as Hedging Instrument [Member] | Deferred Rent, Derivative Liabilities and Other Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Derivative liability $ 0us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= arcp_DeferredRentDerivativeLiabilitiesandOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
$ (16,736)us-gaap_DerivativeLiabilities
/ us-gaap_BalanceSheetLocationAxis
= arcp_DeferredRentDerivativeLiabilitiesandOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EmbeddedDerivativeFinancialInstrumentsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember