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Investment Securities, at Fair Value - Narrative (Detail) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Security
Sep. 29, 2014
Schedule of Available-for-sale Securities [Line Items]          
Investment securities, at fair value $ 59,077,000us-gaap_AvailableForSaleSecurities $ 59,077,000us-gaap_AvailableForSaleSecurities $ 9,480,000us-gaap_AvailableForSaleSecurities $ 62,067,000us-gaap_AvailableForSaleSecurities  
Proceeds from sale of investment securities   159,049,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 111,402,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities [1]    
Equity method investment, realized gain (loss) on sale 178,000us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal        
Commercial Mortgage Backed Securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Number of securities acquired       10arcp_NumberofSecuritiesAcquired
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		  
Investment securities, at fair value 59,077,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 59,077,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		   60,583,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		  
Commercial Mortgage Backed Securities [Member] | Cole Capital [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Proceeds from sale of investment securities         158,000,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= arcp_ColeCapitalMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
Securities, gross realized gain (loss)         6,200,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= arcp_ColeCapitalMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
Commercial Mortgage Backed Securities [Member] | Real Estate Investment Segment [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Number of securities acquired   10arcp_NumberofSecuritiesAcquired
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		      
Cole Merger [Member] | Commercial Mortgage Backed Securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Number of securities acquired   15arcp_NumberofSecuritiesAcquired
/ us-gaap_BusinessAcquisitionAxis
= arcp_ColeRealEstateInvestmentsInc.Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		      
Estimate of Fair Value Measurement [Member] | Commercial Mortgage Backed Securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Investment securities, at fair value       60,600,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		  
Estimate of Fair Value Measurement [Member] | Cole Merger [Member] | Commercial Mortgage Backed Securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Investment securities, at fair value 151,200,000us-gaap_AvailableForSaleSecurities
/ us-gaap_BusinessAcquisitionAxis
= arcp_ColeRealEstateInvestmentsInc.Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 151,200,000us-gaap_AvailableForSaleSecurities
/ us-gaap_BusinessAcquisitionAxis
= arcp_ColeRealEstateInvestmentsInc.Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		      
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Investment securities, at fair value $ 59,077,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		 $ 59,077,000us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember		      
[1] For discussion on the restatement adjustments, see Note 2 - Restatement of Previously Issued Consolidated Financial Statements.