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Summary of Operating Income From Continued Operations Of Multi-Tenant Portfolio (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Long Lived Assets Held-for-sale [Line Items]  
Write off goodwill $ 209,259us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit [1]
Multi Tenant Properties [Member]  
Long Lived Assets Held-for-sale [Line Items]  
Write off goodwill $ 195,500us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= arcp_MultiTenantPropertiesMember
[1] Certain line items have been consolidated from the original presentation in the Quarterly Report on Form 10-Q filing for the three and nine month period ended September 30, 2013.