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Supplemental Detail for Certain Components of Consolidated Balance Sheets - Acquired Lease Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Acquired lease intangible assets, net |  |
Acquired in-place leases | $ 1,272,897 | $ 1,164,075
Accumulated amortization of acquired in-place leases | (444,221) | (358,040)
Acquired above-market leases | 487,933 | 365,005
Accumulated amortization of acquired above-market leases | (121,679) | (88,720)
Total acquired lease intangible assets, net | $ 1,194,930 | $ 1,082,320

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- Definition Represents the accumulated amortization of in-place leases. + References No definition available. + Details
Name: | o_AccumulatedAmortizationOfIntangibleAssetsInPlaceLeases
Namespace Prefix: | o_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the accumulated amortization of above-market leases. + References No definition available. + Details
Name: | o_AccumulatedAmortizationOfIntangibleAssetsOffMarketLeaseFavorableGross
Namespace Prefix: | o_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | o_FiniteLivedIntangibleAssetsAcquiredLeaseNetAbstract
Namespace Prefix: | o_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the amount of value allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property. Such amount may include the value assigned to existing tenant relationships and excludes the market adjustment component of the value assigned for above or below-market leases acquired. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetAcquiredInPlaceLeases
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition This element represents the identifiable intangible asset established upon acquisition based on a favorable difference between the terms of an acquired lease and the current market terms for that lease at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.15) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant