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Gain on Sales of Real Estate (Details) (USD $) | 3 Months Ended
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Mar. 31, 2015 item | Mar. 31, 2014 item
Sales of investment properties |  |
Sales proceeds |  | $ 6,918,000 us-gaap_ProceedsFromSaleOfOtherRealEstate
New properties and properties under development |  |
Sales of investment properties |  |
Number of properties sold | 9 o_InvestmentPropertySalesCount / us-gaap_RealEstatePropertiesAxis = o_RealEstateInvestmentsMember | 11 o_InvestmentPropertySalesCount / us-gaap_RealEstatePropertiesAxis = o_RealEstateInvestmentsMember
Sales proceeds | 22,300,000 us-gaap_ProceedsFromSaleOfOtherRealEstate / us-gaap_RealEstatePropertiesAxis = o_RealEstateInvestmentsMember | 12,700,000 us-gaap_ProceedsFromSaleOfOtherRealEstate / us-gaap_RealEstatePropertiesAxis = o_RealEstateInvestmentsMember
Gain on sales of investment properties | 7,200,000 us-gaap_GainLossOnSaleOfProperties / us-gaap_RealEstatePropertiesAxis = o_RealEstateInvestmentsMember | 3,900,000 us-gaap_GainLossOnSaleOfProperties / us-gaap_RealEstatePropertiesAxis = o_RealEstateInvestmentsMember
New properties and properties under development | Discontinued Operations |  |
Sales of investment properties |  |
Gain on sales of investment properties |  | 2,600,000 us-gaap_GainLossOnSaleOfProperties / us-gaap_RealEstatePropertiesAxis = o_RealEstateInvestmentsMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
New properties and properties under development | Crest Net Lease, Inc. (Crest) |  |
Sales of investment properties |  |
Number of properties sold |  | 1 o_InvestmentPropertySalesCount / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_RealEstatePropertiesAxis = o_RealEstateInvestmentsMember
Sales proceeds |  | $ 820,000 us-gaap_ProceedsFromSaleOfOtherRealEstate / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_RealEstatePropertiesAxis = o_RealEstateInvestmentsMember

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- Definition Number of sales of real estate properties held for investment, that is, it is part of an investing activity during the period. + References No definition available. + Details
Name: | o_InvestmentPropertySalesCount
Namespace Prefix: | o_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The cash inflow associated with the sale of other real estate not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Details
Name: | us-gaap_RealEstatePropertiesLineItems
Namespace Prefix: | us-gaap_
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |