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Other Debt - Convertible Senior Note Offering (Detail) (USD $)
 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Dec. 10, 2013
Aug. 01, 2013
Jul. 29, 2013
Debt Instrument [Line Items]          
Convertible senior note $ 975,003,000us-gaap_ConvertibleNotesPayable [1] $ 972,490,000us-gaap_ConvertibleNotesPayable [1]      
2020 Notes [Member] | Convertible Senior Notes [Member]          
Debt Instrument [Line Items]          
Proceeds from issuance of convertible debt     402,500,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= arcp_ConvertibleSeniorNote2020NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		    
Long-term debt, fair value     389,700,000us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= arcp_ConvertibleSeniorNote2020NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		    
Debt instrument, unamortized discount 25,000,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= arcp_ConvertibleSeniorNote2020NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		   12,800,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= arcp_ConvertibleSeniorNote2020NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		    
Debt Instrument, Convertible, Conversion Ratio 0.0660262us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_DebtInstrumentAxis
= arcp_ConvertibleSeniorNote2020NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		        
Debt Instrument, Interest Rate, Stated Percentage     3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= arcp_ConvertibleSeniorNote2020NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		    
Convertible senior note 390,700,000us-gaap_ConvertibleNotesPayable
/ us-gaap_DebtInstrumentAxis
= arcp_ConvertibleSeniorNote2020NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		        
Original 2018 Notes [Member] | Convertible Senior Notes [Member]          
Debt Instrument [Line Items]          
Proceeds from issuance of convertible debt       10,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= arcp_ConvertibleSeniorNoteOriginal2018NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		 300,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= arcp_ConvertibleSeniorNoteOriginal2018NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
Long-term debt, fair value 301,500,000us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= arcp_ConvertibleSeniorNoteOriginal2018NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		     299,600,000us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= arcp_ConvertibleSeniorNoteOriginal2018NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		  
Debt instrument, unamortized discount       10,400,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= arcp_ConvertibleSeniorNoteOriginal2018NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		  
Debt Instrument, Convertible, Conversion Ratio 0.059805us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_DebtInstrumentAxis
= arcp_ConvertibleSeniorNoteOriginal2018NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		        
Reopened 2018 Notes [Member] | Convertible Senior Notes [Member]          
Debt Instrument [Line Items]          
Proceeds from issuance of convertible debt     287,500,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= arcp_ConvertibleSeniorNoteReopened2018NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		    
Long-term debt, fair value 282,700,000us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= arcp_ConvertibleSeniorNoteReopened2018NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		   282,100,000us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= arcp_ConvertibleSeniorNoteReopened2018NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		    
Debt instrument, unamortized discount     $ 5,400,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= arcp_ConvertibleSeniorNoteReopened2018NotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember		    
[1] For discussion on the restatement adjustments, see Note 2 - Restatement of Previously Issued Financial Statements.