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Goodwill and Other Intangibles Goodwill (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
May 19, 2014
Nov. 05, 2013
Feb. 07, 2014
Goodwill [Roll Forward]            
Goodwill, beginning balance $ 92,789,000us-gaap_Goodwill   $ 0us-gaap_Goodwill      
Measurement period adjustments 22,288,000us-gaap_GoodwillPurchaseAccountingAdjustments          
Goodwill allocated to dispositions (210,139,000)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit [1]          
Impairment (223,064,000)us-gaap_GoodwillImpairmentLoss [2]          
Goodwill, ending balance 1,894,794,000us-gaap_Goodwill   0us-gaap_Goodwill      
Cole Credit Property Trust, Inc. [Member]            
Goodwill [Roll Forward]            
Goodwill, beginning balance       0us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= arcp_ColeCreditPropertyTrustInc.Member		    
Goodwill, ending balance       0us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= arcp_ColeCreditPropertyTrustInc.Member		    
CapLease [Member]            
Goodwill [Roll Forward]            
Goodwill, beginning balance         65,450,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= arcp_CapLeaseInc.Member		  
Goodwill acquired   92,789,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= arcp_CapLeaseInc.Member		        
Goodwill, ending balance         65,450,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= arcp_CapLeaseInc.Member		  
Cole Real Estate Investments, Inc. [Member]            
Goodwill [Roll Forward]            
Goodwill, beginning balance           2,262,547,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= arcp_ColeRealEstateInvestmentsInc.Member
Goodwill acquired 2,212,920,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= arcp_ColeRealEstateInvestmentsInc.Member		 [3]          
Goodwill, ending balance           2,262,547,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= arcp_ColeRealEstateInvestmentsInc.Member
Real Estate Investment Segment [Member]            
Goodwill [Roll Forward]            
Goodwill, beginning balance 92,789,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		   0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		      
Measurement period adjustments (27,339,000)us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		          
Goodwill allocated to dispositions (210,139,000)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		 [1]          
Impairment 0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		 [2]          
Goodwill, ending balance 1,509,396,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		   0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		      
Real Estate Investment Segment [Member] | CapLease [Member]            
Goodwill [Roll Forward]            
Goodwill, beginning balance         92,789,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= arcp_CapLeaseInc.Member
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		  
Goodwill acquired   92,789,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= arcp_CapLeaseInc.Member
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		        
Goodwill, ending balance         92,789,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= arcp_CapLeaseInc.Member
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		  
Real Estate Investment Segment [Member] | Cole Real Estate Investments, Inc. [Member]            
Goodwill [Roll Forward]            
Goodwill, beginning balance           1,654,085,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= arcp_ColeRealEstateInvestmentsInc.Member
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember
Goodwill acquired 1,654,085,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= arcp_ColeRealEstateInvestmentsInc.Member
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember		 [3]          
Goodwill, ending balance           1,654,085,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= arcp_ColeRealEstateInvestmentsInc.Member
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_RealEstateInvestmentSegmentMember
Cole Capital Segment [Member]            
Goodwill [Roll Forward]            
Goodwill, beginning balance 0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_ColeCapitalSegmentMember		   0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_ColeCapitalSegmentMember		      
Measurement period adjustments 49,627,000us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_ColeCapitalSegmentMember		          
Goodwill allocated to dispositions 0us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_ColeCapitalSegmentMember		 [1]          
Impairment (223,064,000)us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_ColeCapitalSegmentMember		 [2]          
Goodwill, ending balance 385,398,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_ColeCapitalSegmentMember		   0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_ColeCapitalSegmentMember		      
Cole Capital Segment [Member] | CapLease [Member]            
Goodwill [Roll Forward]            
Goodwill acquired   0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= arcp_CapLeaseInc.Member
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_ColeCapitalSegmentMember		        
Cole Capital Segment [Member] | Cole Real Estate Investments, Inc. [Member]            
Goodwill [Roll Forward]            
Goodwill, beginning balance           608,462,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= arcp_ColeRealEstateInvestmentsInc.Member
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_ColeCapitalSegmentMember
Goodwill acquired 558,835,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= arcp_ColeRealEstateInvestmentsInc.Member
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_ColeCapitalSegmentMember		 [3]          
Goodwill, ending balance           $ 608,462,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= arcp_ColeRealEstateInvestmentsInc.Member
/ us-gaap_StatementBusinessSegmentsAxis
= arcp_ColeCapitalSegmentMember
[1] Goodwill allocated to the cost basis of properties sold or classified as held for sale is included in loss on held for sale assets and disposition of properties, net, in the consolidated statement of operations.
[2] The Cole Capital reporting segment impairment was recognized during the three months ended December 31, 2014.
[3] Goodwill recognized from the Cole Merger was assigned to the REI segment and Cole Capital based on the excess consideration paid over the fair value of the assets and liabilities acquired and assumed in each segment. Refer to Note 4 – Acquisitions of CapLease, Cole and CCPT for further discussion.