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Related Party Transactions and Arrangements (Merger Related Costs) (Narrative) (Details) (USD $)
 12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Feb. 07, 2014
Jan. 08, 2014
Feb. 28, 2013
Related Party Transaction [Line Items]              
Issuance of stock $ 8,930,263,000us-gaap_StockIssuedDuringPeriodValueNewIssues [1] $ 2,153,925,000us-gaap_StockIssuedDuringPeriodValueNewIssues $ 1,912,774,000us-gaap_StockIssuedDuringPeriodValueNewIssues        
Shares issued (in shares) 138,000,000us-gaap_StockIssuedDuringPeriodSharesNewIssues 47,161,562us-gaap_StockIssuedDuringPeriodSharesNewIssues 3,737,500us-gaap_StockIssuedDuringPeriodSharesNewIssues 7,147,034us-gaap_StockIssuedDuringPeriodSharesNewIssues      
Affiliated Entity [Member]              
Related Party Transaction [Line Items]              
Related party expenses 203,558,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		 0us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		 0us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		        
Affiliated Entity [Member] | Merger And Acquisition Related Costs [Member]              
Related Party Transaction [Line Items]              
Related party expenses 137,778,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= arcp_MergerAndAcquisitionRelatedCostsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		 156,146,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= arcp_MergerAndAcquisitionRelatedCostsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		 0us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= arcp_MergerAndAcquisitionRelatedCostsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		        
Affiliated Entity [Member] | Strategic Advisory Services [Member]              
Related Party Transaction [Line Items]              
Related party expenses 27,265,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= arcp_StrategicAdvisoryServicesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		 36,096,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionAxis
= arcp_StrategicAdvisoryServicesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		          
Cole Real Estate Investments, Inc. [Member] | Affiliated Entity [Member] | Merger And Acquisition Related Costs [Member]              
Related Party Transaction [Line Items]              
Related party expenses 21,815,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_ColeRealEstateInvestmentsInc.Member
/ us-gaap_RelatedPartyTransactionAxis
= arcp_MergerAndAcquisitionRelatedCostsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		 15,847,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_ColeRealEstateInvestmentsInc.Member
/ us-gaap_RelatedPartyTransactionAxis
= arcp_MergerAndAcquisitionRelatedCostsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		          
Cole Real Estate Investments, Inc. [Member] | Affiliated Entity [Member] | Strategic Advisory Services [Member]              
Related Party Transaction [Line Items]              
Related party expenses 17,115,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_ColeRealEstateInvestmentsInc.Member
/ us-gaap_RelatedPartyTransactionAxis
= arcp_StrategicAdvisoryServicesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		 14,215,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_ColeRealEstateInvestmentsInc.Member
/ us-gaap_RelatedPartyTransactionAxis
= arcp_StrategicAdvisoryServicesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		          
Cole Real Estate Investments, Inc. [Member] | Affiliates of Former Manager, One [Member] | Strategic and Financial Advisory Services Fee [Member]              
Related Party Transaction [Line Items]              
Related party expenses 14,200,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_ColeRealEstateInvestmentsInc.Member
/ us-gaap_RelatedPartyTransactionAxis
= arcp_StrategicandFinancialAdvisoryServicesFeeMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arcp_AffiliatesofFormerManagerOneMember		 14,200,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_ColeRealEstateInvestmentsInc.Member
/ us-gaap_RelatedPartyTransactionAxis
= arcp_StrategicandFinancialAdvisoryServicesFeeMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arcp_AffiliatesofFormerManagerOneMember		          
Percentage of contract purchase price         0.25%arcp_RelatedPartyTransactionExpensesfromTransactionswithRelatedPartyPercentageofContractPurchasePrice
/ us-gaap_BusinessAcquisitionAxis
= arcp_ColeRealEstateInvestmentsInc.Member
/ us-gaap_RelatedPartyTransactionAxis
= arcp_StrategicandFinancialAdvisoryServicesFeeMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arcp_AffiliatesofFormerManagerOneMember		    
Cole Real Estate Investments, Inc. [Member] | Affiliates of Former Manager, One [Member] | Transaction Management Support, Marketing Support, Due Diligence Coordination and Event Coordination [Member]              
Related Party Transaction [Line Items]              
Related party expenses           2,900,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_ColeRealEstateInvestmentsInc.Member
/ us-gaap_RelatedPartyTransactionAxis
= arcp_TransactionManagementSupportMarketingSupportDueDiligenceCoordinationandEventCoordinationMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arcp_AffiliatesofFormerManagerOneMember		  
Payments of related party expenses           2,900,000arcp_RelatedPartyTransactionPaymentstoRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_ColeRealEstateInvestmentsInc.Member
/ us-gaap_RelatedPartyTransactionAxis
= arcp_TransactionManagementSupportMarketingSupportDueDiligenceCoordinationandEventCoordinationMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arcp_AffiliatesofFormerManagerOneMember		  
Multiple-Tenant Spin Off [Member] | Affiliated Entity [Member] | Merger And Acquisition Related Costs [Member]              
Related Party Transaction [Line Items]              
Related party expenses 1,750,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_MultipleTenantSpinOffMember
/ us-gaap_RelatedPartyTransactionAxis
= arcp_MergerAndAcquisitionRelatedCostsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		            
Multiple-Tenant Spin Off [Member] | Affiliated Entity [Member] | Strategic Advisory Services [Member]              
Related Party Transaction [Line Items]              
Related party expenses 1,750,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_MultipleTenantSpinOffMember
/ us-gaap_RelatedPartyTransactionAxis
= arcp_StrategicAdvisoryServicesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		            
ARCT III [Member] | Affiliates of Former Manager, Three [Member] | Merger And Acquisition Related Costs [Member]              
Related Party Transaction [Line Items]              
Related party expenses             300,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_AmericanRealtyCapitalTrustIIIInc.Member
/ us-gaap_RelatedPartyTransactionAxis
= arcp_MergerAndAcquisitionRelatedCostsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arcp_AffiliatesofFormerManagerThreeMember
ARCT III [Member] | Affiliates of Former Manager, Four [Member] | Merger And Acquisition Related Costs [Member]              
Related Party Transaction [Line Items]              
Related party expenses             400,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_AmericanRealtyCapitalTrustIIIInc.Member
/ us-gaap_RelatedPartyTransactionAxis
= arcp_MergerAndAcquisitionRelatedCostsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arcp_AffiliatesofFormerManagerFourMember
ARCT III [Member] | Affiliated Entity [Member] | Merger And Acquisition Related Costs [Member]              
Related Party Transaction [Line Items]              
Related party expenses   107,758,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_AmericanRealtyCapitalTrustIIIInc.Member
/ us-gaap_RelatedPartyTransactionAxis
= arcp_MergerAndAcquisitionRelatedCostsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		          
ARCT III [Member] | Affiliated Entity [Member] | Strategic Advisory Services [Member]              
Related Party Transaction [Line Items]              
Related party expenses   0us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_AmericanRealtyCapitalTrustIIIInc.Member
/ us-gaap_RelatedPartyTransactionAxis
= arcp_StrategicAdvisoryServicesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		          
ARCT IV [Member] | Affiliated Entity [Member] | Merger And Acquisition Related Costs [Member]              
Related Party Transaction [Line Items]              
Related party expenses 94,213,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_AmericanRealtyCapitalTrustIVInc.Member
/ us-gaap_RelatedPartyTransactionAxis
= arcp_MergerAndAcquisitionRelatedCostsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		 22,459,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_AmericanRealtyCapitalTrustIVInc.Member
/ us-gaap_RelatedPartyTransactionAxis
= arcp_MergerAndAcquisitionRelatedCostsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		          
ARCT IV [Member] | Affiliated Entity [Member] | Strategic Advisory Services [Member]              
Related Party Transaction [Line Items]              
Related party expenses 8,400,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_AmericanRealtyCapitalTrustIVInc.Member
/ us-gaap_RelatedPartyTransactionAxis
= arcp_StrategicAdvisoryServicesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		 16,075,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_AmericanRealtyCapitalTrustIVInc.Member
/ us-gaap_RelatedPartyTransactionAxis
= arcp_StrategicAdvisoryServicesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		          
ARCT IV [Member] | Affiliated Entity [Member] | Legal Support Services [Member]              
Related Party Transaction [Line Items]              
Accounts Payable, Related Parties, Current   500,000us-gaap_AccountsPayableRelatedPartiesCurrent
/ us-gaap_BusinessAcquisitionAxis
= arcp_AmericanRealtyCapitalTrustIVInc.Member
/ us-gaap_RelatedPartyTransactionAxis
= arcp_LegalSupportServicesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		          
ARCT IV [Member] | Affiliates of Former Manager, Five [Member] | Brokerage Commission Fee [Member]              
Related Party Transaction [Line Items]              
Related party expenses 0us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_AmericanRealtyCapitalTrustIVInc.Member
/ us-gaap_RelatedPartyTransactionAxis
= arcp_BrokerageCommissionFeeMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arcp_AffiliatesofFormerManagerFiveMember		            
ARCT IV [Member] | Manager [Member] | Strategic and Financial Advisory Services Fee [Member]              
Related Party Transaction [Line Items]              
Payments of related party expenses   7,700,000arcp_RelatedPartyTransactionPaymentstoRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_AmericanRealtyCapitalTrustIVInc.Member
/ us-gaap_RelatedPartyTransactionAxis
= arcp_StrategicandFinancialAdvisoryServicesFeeMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arcp_ManagerMember		          
Strategic advisory services fee   0.25%arcp_RelatedpartytransactionsStrategicAdvisoryServicesFee
/ us-gaap_BusinessAcquisitionAxis
= arcp_AmericanRealtyCapitalTrustIVInc.Member
/ us-gaap_RelatedPartyTransactionAxis
= arcp_StrategicandFinancialAdvisoryServicesFeeMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arcp_ManagerMember		          
ARCT IV [Member] | Manager [Member] | Strategic and Financial Advisory Services Fee Reimbursement [Member]              
Related Party Transaction [Line Items]              
Payments of related party expenses   800,000arcp_RelatedPartyTransactionPaymentstoRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_AmericanRealtyCapitalTrustIVInc.Member
/ us-gaap_RelatedPartyTransactionAxis
= arcp_StrategicandFinancialAdvisoryServicesFeeReimbursementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arcp_ManagerMember		          
CapLease Acquisition [Member] | Affiliated Entity [Member] | Merger And Acquisition Related Costs [Member]              
Related Party Transaction [Line Items]              
Related party expenses   9,512,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_CapLeaseAcquisitionMember
/ us-gaap_RelatedPartyTransactionAxis
= arcp_MergerAndAcquisitionRelatedCostsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		          
CapLease Acquisition [Member] | Affiliated Entity [Member] | Strategic Advisory Services [Member]              
Related Party Transaction [Line Items]              
Related party expenses   5,563,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_CapLeaseAcquisitionMember
/ us-gaap_RelatedPartyTransactionAxis
= arcp_StrategicAdvisoryServicesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		          
CapLease Acquisition [Member] | Affiliates Of Former Manager [Member] | Strategic and Financial Advisory Services Fee [Member]              
Related Party Transaction [Line Items]              
Payments of related party expenses   5,600,000arcp_RelatedPartyTransactionPaymentstoRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_CapLeaseAcquisitionMember
/ us-gaap_RelatedPartyTransactionAxis
= arcp_StrategicandFinancialAdvisoryServicesFeeMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arcp_AffiliatesOfFormerManagerMember		          
Service fee percentage   0.25%arcp_RelatedPartyTransactionServiceFeePercentage
/ us-gaap_BusinessAcquisitionAxis
= arcp_CapLeaseAcquisitionMember
/ us-gaap_RelatedPartyTransactionAxis
= arcp_StrategicandFinancialAdvisoryServicesFeeMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arcp_AffiliatesOfFormerManagerMember		          
ARCT IV [Member] | ARCT IV [Member] | Affiliated Entity [Member] | Strategic Advisory Services [Member]              
Related Party Transaction [Line Items]              
Related party expenses   800,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_AmericanRealtyCapitalTrustIVInc.Member
/ dei_LegalEntityAxis
= arcp_AmericanRealtyCapitalTrustIVInc.Member
/ us-gaap_RelatedPartyTransactionAxis
= arcp_StrategicAdvisoryServicesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		          
ARCT IV [Member] | ARCT IV [Member] | Affiliated Entity [Member] | Strategic Advisory Services, Reimbursed Expenses [Member]              
Related Party Transaction [Line Items]              
Payments of related party expenses   200,000arcp_RelatedPartyTransactionPaymentstoRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_AmericanRealtyCapitalTrustIVInc.Member
/ dei_LegalEntityAxis
= arcp_AmericanRealtyCapitalTrustIVInc.Member
/ us-gaap_RelatedPartyTransactionAxis
= arcp_StrategicAdvisoryServicesReimbursedExpensesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		          
ARCT IV [Member] | ARCT IV [Member] | Affiliates of Former Manager, Five [Member] | Brokerage Commission Fee [Member]              
Related Party Transaction [Line Items]              
Payments of related party expenses 8,400,000arcp_RelatedPartyTransactionPaymentstoRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_AmericanRealtyCapitalTrustIVInc.Member
/ dei_LegalEntityAxis
= arcp_AmericanRealtyCapitalTrustIVInc.Member
/ us-gaap_RelatedPartyTransactionAxis
= arcp_BrokerageCommissionFeeMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arcp_AffiliatesofFormerManagerFiveMember		 0arcp_RelatedPartyTransactionPaymentstoRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_AmericanRealtyCapitalTrustIVInc.Member
/ dei_LegalEntityAxis
= arcp_AmericanRealtyCapitalTrustIVInc.Member
/ us-gaap_RelatedPartyTransactionAxis
= arcp_BrokerageCommissionFeeMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arcp_AffiliatesofFormerManagerFiveMember		          
RCS Advisory [Member] | Merger And Acquisition Related Costs, Expense Reimbursement [Member]              
Related Party Transaction [Line Items]              
Payments of related party expenses   500,000arcp_RelatedPartyTransactionPaymentstoRelatedParty
/ us-gaap_CounterpartyNameAxis
= arcp_RCSAdvisoryMember
/ us-gaap_RelatedPartyTransactionAxis
= arcp_MergerAndAcquisitionRelatedCostsExpenseReimbursementMember		          
RCS Advisory [Member] | ARCT IV [Member] | Strategic and Financial Advisory Services Fee [Member]              
Related Party Transaction [Line Items]              
Payments of related party expenses   7,700,000arcp_RelatedPartyTransactionPaymentstoRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_AmericanRealtyCapitalTrustIVInc.Member
/ us-gaap_CounterpartyNameAxis
= arcp_RCSAdvisoryMember
/ us-gaap_RelatedPartyTransactionAxis
= arcp_StrategicandFinancialAdvisoryServicesFeeMember		          
RCS Advisory [Member] | ARCT IV [Member] | Strategic and Financial Advisory Services Fee Reimbursement [Member]              
Related Party Transaction [Line Items]              
Payments of related party expenses   600,000arcp_RelatedPartyTransactionPaymentstoRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_AmericanRealtyCapitalTrustIVInc.Member
/ us-gaap_CounterpartyNameAxis
= arcp_RCSAdvisoryMember
/ us-gaap_RelatedPartyTransactionAxis
= arcp_StrategicandFinancialAdvisoryServicesFeeReimbursementMember		          
RCS Advisory [Member] | CapLease Acquisition [Member] | Affiliates Of Former Manager [Member] | Strategic and Financial Advisory Services Fee [Member]              
Related Party Transaction [Line Items]              
Payments of related party expenses   3,600,000arcp_RelatedPartyTransactionPaymentstoRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_CapLeaseAcquisitionMember
/ us-gaap_CounterpartyNameAxis
= arcp_RCSAdvisoryMember
/ us-gaap_RelatedPartyTransactionAxis
= arcp_StrategicandFinancialAdvisoryServicesFeeMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arcp_AffiliatesOfFormerManagerMember		          
ARC Advisory [Member] | CapLease Acquisition [Member] | Affiliates Of Former Manager [Member] | Strategic and Financial Advisory Services Fee [Member]              
Related Party Transaction [Line Items]              
Payments of related party expenses   200,000arcp_RelatedPartyTransactionPaymentstoRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_CapLeaseAcquisitionMember
/ us-gaap_CounterpartyNameAxis
= arcp_ARCAdvisoryMember
/ us-gaap_RelatedPartyTransactionAxis
= arcp_StrategicandFinancialAdvisoryServicesFeeMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= arcp_AffiliatesOfFormerManagerMember		          
RCS, RCS Advisory and ANST [Member] | ARCT IV [Member] | Strategic and Financial Advisory Services Fee [Member]              
Related Party Transaction [Line Items]              
Payments of related party expenses   $ 600,000arcp_RelatedPartyTransactionPaymentstoRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= arcp_AmericanRealtyCapitalTrustIVInc.Member
/ us-gaap_CounterpartyNameAxis
= arcp_RCSRCSAdvisoryandANSTMember
/ us-gaap_RelatedPartyTransactionAxis
= arcp_StrategicandFinancialAdvisoryServicesFeeMember		          
[1] Includes $2.2 million, $161.8 million and $211.4 million to affiliates for the years ended December 31, 2014, December 31, 2013, and December 31, 2012, respectively.