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Summary of Significant Accounting Policies (Details) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended
May 16, 2014
Dec. 31, 2014
mortgage_note
property
Dec. 31, 2014
segment
mortgage_note
property
Dec. 31, 2013
property
Dec. 31, 2012
Feb. 28, 2013
Aug. 20, 2013
Jul. 29, 2013
Aug. 01, 2013
Dec. 10, 2013
Schedule of Equity Method Investments [Line Items]                    
Reverse Section 1031 like-kind exchange agreement, period 180 days                  
Impairment of real estate investments   $ 96,700,000us-gaap_ImpairmentOfRealEstate $ 100,547,000us-gaap_ImpairmentOfRealEstate $ 3,346,000us-gaap_ImpairmentOfRealEstate            
Goodwill, Impairment Loss     223,064,000us-gaap_GoodwillImpairmentLoss [1]              
Cash and cash equivalents   416,711,000us-gaap_CashAndCashEquivalentsAtCarryingValue 416,711,000us-gaap_CashAndCashEquivalentsAtCarryingValue 52,725,000us-gaap_CashAndCashEquivalentsAtCarryingValue 292,575,000us-gaap_CashAndCashEquivalentsAtCarryingValue          
Number of mortgage notes receivable   2arcp_NumberOfMortgageNotesReceivable 2arcp_NumberOfMortgageNotesReceivable              
Deferred Finance Costs, Net   126,200,000us-gaap_DeferredFinanceCostsNet 126,200,000us-gaap_DeferredFinanceCostsNet 84,700,000us-gaap_DeferredFinanceCostsNet            
Stock repurchase program, authorized amount             250,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1      
Deferred rental income   57,800,000us-gaap_DeferredRentCredit 57,800,000us-gaap_DeferredRentCredit 20,400,000us-gaap_DeferredRentCredit            
Allowance for Doubtful Accounts Receivable   2,500,000us-gaap_AllowanceForDoubtfulAccountsReceivable 2,500,000us-gaap_AllowanceForDoubtfulAccountsReceivable 187,000us-gaap_AllowanceForDoubtfulAccountsReceivable            
Other income, net     (77,000)us-gaap_IncomeLossFromEquityMethodInvestments 0us-gaap_IncomeLossFromEquityMethodInvestments 0us-gaap_IncomeLossFromEquityMethodInvestments          
Number of reportable segments     2us-gaap_NumberOfReportableSegments              
Number of real estate properties, held for sale   2arcp_NumberOfRealEstatePropertiesHeldforSale 2arcp_NumberOfRealEstatePropertiesHeldforSale 1arcp_NumberOfRealEstatePropertiesHeldforSale            
Cash, Uninsured Amount   412,700,000us-gaap_CashUninsuredAmount 412,700,000us-gaap_CashUninsuredAmount 44,300,000us-gaap_CashUninsuredAmount            
Equity Method Investment, Other than Temporary Impairment     0us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment              
Building [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property, plant and equipment, useful life     40 years              
Minimum [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Lease Up Period     6 months              
Minimum [Member] | Office Furniture, Fixtures and Equipment and Computer Hardware and Software [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property, plant and equipment, useful life     5 years              
Minimum [Member] | Building and Building Improvements [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property, plant and equipment, useful life     5 years              
Maximum [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Lease Up Period     18 months              
Maximum [Member] | Office Furniture, Fixtures and Equipment and Computer Hardware and Software [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property, plant and equipment, useful life     7 years              
Maximum [Member] | Building and Building Improvements [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Property, plant and equipment, useful life     15 years              
Cole Real Estate Investments, Inc. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of mortgage notes receivable   2arcp_NumberOfMortgageNotesReceivable
/ us-gaap_BusinessAcquisitionAxis
= arcp_ColeRealEstateInvestmentsInc.Member		 2arcp_NumberOfMortgageNotesReceivable
/ us-gaap_BusinessAcquisitionAxis
= arcp_ColeRealEstateInvestmentsInc.Member		              
ARCT III [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Acquiree shares exchanged for cash           29,200,000arcp_BusinessCombinationAcquireeSharesExchangedForCash
/ us-gaap_BusinessAcquisitionAxis
= arcp_AmericanRealtyCapitalTrustIIIInc.Member		        
Percentage of shares outstanding           16.50%arcp_BusinessCombinationPercentageOfAcquireeSharesExchangedForCash
/ us-gaap_BusinessAcquisitionAxis
= arcp_AmericanRealtyCapitalTrustIIIInc.Member		        
Consideration transferred, amount per share (in dollars per share)           $ 12.00arcp_BusinessCombinationConsiderationTransferredAmountPerShare
/ us-gaap_BusinessAcquisitionAxis
= arcp_AmericanRealtyCapitalTrustIIIInc.Member		        
Acquiree shares equivalent of acquirer shares           27,700,000arcp_BusinessCombinationAcquireeSharesEquivalentOfAcquirerShares
/ us-gaap_BusinessAcquisitionAxis
= arcp_AmericanRealtyCapitalTrustIIIInc.Member		        
Acquiree shares exchanged for acquirer shares           148,100,000arcp_BusinessCombinationAcquireeSharesExchangedForAcquirerShares
/ us-gaap_BusinessAcquisitionAxis
= arcp_AmericanRealtyCapitalTrustIIIInc.Member		        
Equity interest issued or issuable (in shares)           140,700,000us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= arcp_AmericanRealtyCapitalTrustIIIInc.Member		        
Member Units [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Antidilutive securities excluded from computation of earnings per share (in shares)     23,763,797us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_MemberUnitsMember		 9,591,173us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_MemberUnitsMember		            
Unconsolidated Joint Venture [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Number of unconsolidated joint ventures   6arcp_NumberofUnconsolidatedJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arcp_UnconsolidatedJointVentureMember		 6arcp_NumberofUnconsolidatedJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arcp_UnconsolidatedJointVentureMember		              
Number of owned properties   6us-gaap_NumberOfRealEstateProperties
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arcp_UnconsolidatedJointVentureMember		 6us-gaap_NumberOfRealEstateProperties
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arcp_UnconsolidatedJointVentureMember		              
Carrying amount of investment   94,200,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arcp_UnconsolidatedJointVentureMember		 94,200,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arcp_UnconsolidatedJointVentureMember		              
Other income, net     1,500,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arcp_UnconsolidatedJointVentureMember		              
Unconsolidated Managed Real Estate Investment Trusts [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Carrying amount of investment   3,900,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arcp_UnconsolidatedManagedRealEstateInvestmentTrustsMember		 3,900,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arcp_UnconsolidatedManagedRealEstateInvestmentTrustsMember		              
Other income, net     (1,600,000)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= arcp_UnconsolidatedManagedRealEstateInvestmentTrustsMember		              
Discontinued Operations [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Impairment of real estate investments         600,000us-gaap_ImpairmentOfRealEstate
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember		          
Cole Capital Segment [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Impairment of real estate investments     309,444,000us-gaap_ImpairmentOfRealEstate
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_ColeCapitalSegmentMember		 0us-gaap_ImpairmentOfRealEstate
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_ColeCapitalSegmentMember		 0us-gaap_ImpairmentOfRealEstate
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_ColeCapitalSegmentMember		          
Goodwill, Impairment Loss     223,064,000us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_ColeCapitalSegmentMember		 [1]              
Real Estate Investment Segment [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Impairment of real estate investments     100,547,000us-gaap_ImpairmentOfRealEstate
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		 3,346,000us-gaap_ImpairmentOfRealEstate
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		 0us-gaap_ImpairmentOfRealEstate
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		          
Goodwill, Impairment Loss     0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		 [1]              
Reporting unit carrying value   19,300,000,000us-gaap_AssetsNet
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		 19,300,000,000us-gaap_AssetsNet
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		              
Percentage of fair value in excess of carrying amount   5.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		 5.00%us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		              
Other income, net     0us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		 411,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		 0us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		          
Management And Advisory Contracts [Member] | Cole Real Estate Investments, Inc. [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Impairment of Intangible Assets, Finite-lived     86,400,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_BusinessAcquisitionAxis
= arcp_ColeRealEstateInvestmentsInc.Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ContractualRightsMember		              
Leases, Acquired-in-Place [Member] | Minimum [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Finite-Lived Intangible Asset, Useful Life     2 years              
Leases, Acquired-in-Place [Member] | Maximum [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Finite-Lived Intangible Asset, Useful Life     20 years              
Interest Expense [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Write off of deferred financing costs     64,200,000us-gaap_WriteOffOfDeferredDebtIssuanceCost
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember		              
Extinguishment of Debt, Net [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Write off of deferred financing costs     6,600,000us-gaap_WriteOffOfDeferredDebtIssuanceCost
/ us-gaap_IncomeStatementLocationAxis
= arcp_ExtinguishmentofDebtNetMember		              
Deferred Costs and Other Assets, Net [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Deferred Offering Costs   13,100,000us-gaap_DeferredOfferingCosts
/ us-gaap_BalanceSheetLocationAxis
= arcp_DeferredCostsandOtherAssetsNetMember		 13,100,000us-gaap_DeferredOfferingCosts
/ us-gaap_BalanceSheetLocationAxis
= arcp_DeferredCostsandOtherAssetsNetMember		              
Convertible Debt [Member] | Convertible Senior Note [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Debt issued amount               300,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= arcp_ConvertibleSeniorNoteMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		    
Convertible Debt [Member] | Original 2018 Notes [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Debt issued amount                 10,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= arcp_ConvertibleSeniorNoteOriginal2018NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		  
Convertible Debt [Member] | Reopened 2018 Notes [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Debt issued amount                   287,500,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= arcp_ConvertibleSeniorNoteReopened2018NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
Convertible Debt [Member] | 2020 Notes [Member]                    
Schedule of Equity Method Investments [Line Items]                    
Debt issued amount                   $ 402,500,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= arcp_ConvertibleSeniorNote2020NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
[1] The Cole Capital reporting segment impairment was recognized during the three months ended December 31, 2014.