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Other Debt - Secured Term Loan Borrowings and Collateral (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Debt Instrument [Line Items]  
Borrowings $ 149,804us-gaap_LongTermDebt
Secured Debt [Member] | Loans Held For Investment [Member]  
Debt Instrument [Line Items]  
Borrowings 31,597us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= arcp_LoansHeldForInvestmentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Collateral Carrying Value 44,670us-gaap_DebtInstrumentCollateralAmount
/ us-gaap_DebtInstrumentAxis
= arcp_LoansHeldForInvestmentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Secured Debt [Member] | Intercompany Mortgage Loans [Member]  
Debt Instrument [Line Items]  
Borrowings 5,525us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= arcp_IntercompanyMortgageMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Collateral Carrying Value 17,124us-gaap_DebtInstrumentCollateralAmount
/ us-gaap_DebtInstrumentAxis
= arcp_IntercompanyMortgageMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Secured Debt [Member] | Commercial Mortgage Backed Securities [Member]  
Debt Instrument [Line Items]  
Borrowings 13,529us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Collateral Carrying Value 21,900us-gaap_DebtInstrumentCollateralAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Secured Debt [Member] | Secured Term Loan [Member]  
Debt Instrument [Line Items]  
Borrowings 50,651us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= arcp_SecuredTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Collateral Carrying Value $ 83,694us-gaap_DebtInstrumentCollateralAmount
/ us-gaap_DebtInstrumentAxis
= arcp_SecuredTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember