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Gain on Sales of Investment Properties (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Sales of investment properties |  |  |
Sales proceeds | $ 6,918,000 us-gaap_ProceedsFromSaleOfOtherRealEstate | $ 126,785,000 us-gaap_ProceedsFromSaleOfOtherRealEstate | $ 50,563,000 us-gaap_ProceedsFromSaleOfOtherRealEstate
Gain on sale of real estate |  |  |
Sales of investment properties |  |  |
Number of properties sold | 46 o_InvestmentPropertySalesCount / us-gaap_RealEstatePropertiesAxis = o_RealEstateInvestmentsMember | 75 o_InvestmentPropertySalesCount / us-gaap_RealEstatePropertiesAxis = o_RealEstateInvestmentsMember | 44 o_InvestmentPropertySalesCount / us-gaap_RealEstatePropertiesAxis = o_RealEstateInvestmentsMember
Sales proceeds | 107,200,000 us-gaap_ProceedsFromSaleOfOtherRealEstate / us-gaap_RealEstatePropertiesAxis = o_RealEstateInvestmentsMember | 134,200,000 us-gaap_ProceedsFromSaleOfOtherRealEstate / us-gaap_RealEstatePropertiesAxis = o_RealEstateInvestmentsMember | 50,600,000 us-gaap_ProceedsFromSaleOfOtherRealEstate / us-gaap_RealEstatePropertiesAxis = o_RealEstateInvestmentsMember
Gain on sales of investment properties | 42,100,000 us-gaap_GainLossOnSaleOfProperties / us-gaap_RealEstatePropertiesAxis = o_RealEstateInvestmentsMember | 64,700,000 us-gaap_GainLossOnSaleOfProperties / us-gaap_RealEstatePropertiesAxis = o_RealEstateInvestmentsMember | 9,900,000 us-gaap_GainLossOnSaleOfProperties / us-gaap_RealEstatePropertiesAxis = o_RealEstateInvestmentsMember
Gain on sale of real estate | 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 | 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 | $ 597,000 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
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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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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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- Details
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- Details
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