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Segment Reporting - Narrative (Detail)
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Segment
Dec. 31, 2013
Security
Segment Reporting Information [Line Items]    
Number of reportable segments 2us-gaap_NumberOfReportableSegments  
Minimum Lease Term of Contract Considered Long-term 10 years  
Minimum [Member]    
Segment Reporting Information [Line Items]    
Lease Term of Contract, Remaining Term Considered Medium-term 3 years  
Maximum [Member]    
Segment Reporting Information [Line Items]    
Lease Term of Contract, Remaining Term Considered Medium-term 8 years  
Commercial Mortgage Backed Securities [Member]    
Segment Reporting Information [Line Items]    
Number of securities acquired   10arcp_NumberofSecuritiesAcquired
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
Real Estate Investment Segment [Member]    
Segment Reporting Information [Line Items]    
Real estate portfolio, property concentration, percentage 70.00%arcp_RealEstatePortfolioPropertyConcentrationLongtermLeasesPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		  
Real estate investments, property concentration, medium-term leases, percentage 30.00%arcp_RealEstatePortfolioPropertyConcentrationMediumTermLeasesPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		  
Number of loans held for investment 14arcp_NumberOfLoansHeldForInvestment
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		  
Real Estate Investment Segment [Member] | Minimum [Member]    
Segment Reporting Information [Line Items]    
Real estate portfolio, property average remaining lease term 10 years  
Real Estate Investment Segment [Member] | Maximum [Member]    
Segment Reporting Information [Line Items]    
Real estate portfolio, property average remaining lease term 12 years  
Real Estate Investment Segment [Member] | Commercial Mortgage Backed Securities [Member]    
Segment Reporting Information [Line Items]    
Number of securities acquired 25arcp_NumberofSecuritiesAcquired
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		  
Consolidated Properties [Member] | Real Estate Investment Segment [Member]    
Segment Reporting Information [Line Items]    
Number of owned properties 3,966us-gaap_NumberOfRealEstateProperties
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		  
Square feet of property 106,800,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		  
Number of states in which entity operates 49us-gaap_NumberOfStatesInWhichEntityOperates
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		  
Percentage of rentable space leased 98.80%arcp_PercentageOfNetRentableAreaLeased
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		  
Real estate property, weighted average remaining lease term 9 years 11 months 12 days  
Consolidated Properties [Member] | Real Estate Investment Segment [Member] | Commercial Mortgage Backed Securities [Member]    
Segment Reporting Information [Line Items]    
Number of securities acquired 25arcp_NumberofSecuritiesAcquired
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		  
Consolidated Properties [Member] | Real Estate Investment Segment [Member] | Unconsolidated Properties [Member]    
Segment Reporting Information [Line Items]    
Number of owned properties 6us-gaap_NumberOfRealEstateProperties
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_UnconsolidatedPropertiesMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		  
Net rentable area (in square feet) 1,600,000us-gaap_NetRentableArea
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_UnconsolidatedPropertiesMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember