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Noncontrolling Interests (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Jan. 22, 2013 | Jun. 27, 2013
Noncontrolling interests |  |  |  |
Conversion ratio | 1 o_MinorityInterestRedemptionCommonStockConversionRatio |  |  |
Change in the carrying value of all noncontrolling interests |  |  |  |
Carrying value at beginning of the period | $ 35,911 us-gaap_MinorityInterest |  |  |
Fair value of units issued at beginning of the period |  | 36,563 us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest |  |
Allocation of net income | 1,305 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 719 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  |
Carrying value at end of the period | 27,698 us-gaap_MinorityInterest | 35,911 us-gaap_MinorityInterest |  |
Carrying value of preferred units | 6,750 o_PreferredUnitsIssuedInBusinessAcquisitionValue | 6,750 o_PreferredUnitsIssuedInBusinessAcquisitionValue |  |
Noncontrolling interests |  |  |  |
Change in the carrying value of all noncontrolling interests |  |  |  |
Carrying value at beginning of the period | 35,911 us-gaap_MinorityInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |
Fair value of units issued at beginning of the period |  | 36,563 us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Reallocation of equity | (6,647)o_NoncontrollingInterestReallocationOfEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |
Redemption | (1,032)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |
Distributions | (1,839)us-gaap_DistributionsPayableToRealEstatePartnerships / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (1,371)us-gaap_DistributionsPayableToRealEstatePartnerships / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Allocation of net income | 1,305 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 719 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Carrying value at end of the period | 27,698 us-gaap_MinorityInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 35,911 us-gaap_MinorityInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |
Tau Operating Partnership, L.P. |  |  |  |
Noncontrolling interests |  |  |  |
Realty Income partnership units, ownership interest (as a percent) | 99.30%o_PartnershipOwnershipInterestPercentage / dei_LegalEntityAxis = o_TauOperatingPartnershipLPMember |  |  |
Change in the carrying value of all noncontrolling interests |  |  |  |
Carrying value at beginning of the period | 13,489 us-gaap_MinorityInterest / dei_LegalEntityAxis = o_TauOperatingPartnershipLPMember |  |  |
Fair value of units issued at beginning of the period |  | 13,962 us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest / dei_LegalEntityAxis = o_TauOperatingPartnershipLPMember |  |
Distributions | (695)us-gaap_DistributionsPayableToRealEstatePartnerships / dei_LegalEntityAxis = o_TauOperatingPartnershipLPMember | (691)us-gaap_DistributionsPayableToRealEstatePartnerships / dei_LegalEntityAxis = o_TauOperatingPartnershipLPMember |  |
Allocation of net income | 273 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = o_TauOperatingPartnershipLPMember | 218 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = o_TauOperatingPartnershipLPMember |  |
Carrying value at end of the period | 13,067 us-gaap_MinorityInterest / dei_LegalEntityAxis = o_TauOperatingPartnershipLPMember | 13,489 us-gaap_MinorityInterest / dei_LegalEntityAxis = o_TauOperatingPartnershipLPMember |  |
Units held by third party | 317,022 o_PartnershipUnits / dei_LegalEntityAxis = o_TauOperatingPartnershipLPMember |  | 317,022 o_PartnershipUnits / dei_LegalEntityAxis = o_TauOperatingPartnershipLPMember |
Carrying value of preferred units | 6,750 o_PreferredUnitsIssuedInBusinessAcquisitionValue / dei_LegalEntityAxis = o_TauOperatingPartnershipLPMember |  |  |
Realty Income, L.P. |  |  |  |
Noncontrolling interests |  |  |  |
Third party partnership units, ownership interest (as a percent) | 2.10%o_PartnershipOwnershipInterestPercentageRepresentedByPartnershipUnitsIssued / dei_LegalEntityAxis = o_RealtyIncomeLPMember |  |  |
Realty Income partnership units, ownership interest (as a percent) | 97.90%o_PartnershipOwnershipInterestPercentage / dei_LegalEntityAxis = o_RealtyIncomeLPMember |  |  |
Change in the carrying value of all noncontrolling interests |  |  |  |
Carrying value at beginning of the period | 22,422 us-gaap_MinorityInterest / dei_LegalEntityAxis = o_RealtyIncomeLPMember |  |  |
Fair value of units issued at beginning of the period |  | 22,601 us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest / dei_LegalEntityAxis = o_RealtyIncomeLPMember |  |
Reallocation of equity | (6,647)o_NoncontrollingInterestReallocationOfEquity / dei_LegalEntityAxis = o_RealtyIncomeLPMember |  |  |
Redemption | (1,032)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / dei_LegalEntityAxis = o_RealtyIncomeLPMember |  |  |
Distributions | (1,144)us-gaap_DistributionsPayableToRealEstatePartnerships / dei_LegalEntityAxis = o_RealtyIncomeLPMember | (680)us-gaap_DistributionsPayableToRealEstatePartnerships / dei_LegalEntityAxis = o_RealtyIncomeLPMember |  |
Allocation of net income | 1,032 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = o_RealtyIncomeLPMember | 501 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = o_RealtyIncomeLPMember |  |
Carrying value at end of the period | $ 14,631 us-gaap_MinorityInterest / dei_LegalEntityAxis = o_RealtyIncomeLPMember | $ 22,422 us-gaap_MinorityInterest / dei_LegalEntityAxis = o_RealtyIncomeLPMember |  |
Units held by third party | 499,546 o_PartnershipUnits / dei_LegalEntityAxis = o_RealtyIncomeLPMember |  |  | 534,546 o_PartnershipUnits / dei_LegalEntityAxis = o_RealtyIncomeLPMember

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest). + 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 210.5-02.31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 27 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 7 + Details
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