Name:	o_AcquiredPropertiesInvestmentsToTenantAsPercentageOfTotalAssets
Namespace Prefix:	o_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the portion of real estate properties leased during the period with existing tenant lease agreements in place expressed as a percentage of total area.

No definition available.

Name:	o_AcquiredPropertiesLeasedPercentage
Namespace Prefix:	o_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The number of states in which the real estate properties acquired during the period operate.

No definition available.

Name:	o_AcquiredPropertiesLocationInNumberOfStates
Namespace Prefix:	o_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the number of industries in which tenants of the real estate properties acquired during the period operate.

No definition available.

Name:	o_AcquiredPropertiesNumberOfIndustriesInWhichTenantsOperate
Namespace Prefix:	o_
Data Type:	xbrli:integerItemType
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Period Type:	duration

Represents the number of tenants related to acquisition of real estate properties.

No definition available.

Name:	o_AcquiredPropertiesNumberOfTenants
Namespace Prefix:	o_
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Balance Type:	na
Period Type:	duration

Represents the percentage of the real estate properties acquired during the period by the type of real estate.

No definition available.

Name:	o_AcquiredPropertiesPercentageByTypeOfRealEstate
Namespace Prefix:	o_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

For new properties during the period, the weighted average contractual lease rate computed as estimated contractual net operating income (in a net-leased property that is equal to the aggregate base rent or, in the case of properties under development, the estimated aggregate base rent under the lease) for the first year of each lease, divided by the estimated total cost of the properties.

No definition available.

Name:	o_AcquiredPropertiesWeightedAverageContractualLeaseRate
Namespace Prefix:	o_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Average period of time covered by real estate lease contracts.

No definition available.

Name:	o_AverageLeaseTerm
Namespace Prefix:	o_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represent the direct costs of the business combination used for calculating the pro-forma amounts.

No definition available.

Name:	o_BusinessAcquisitionsAcquiredEntityTransactionCostsForProFormaInformation
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the amount of increase (decrease) in amortization expense expected to be recognized for assets, lacking physical substance with a finite life.

No definition available.

Name:	o_FiniteLivedIntangibleAssetsAmortizationExpenseIncreaseDecrease
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Name:	o_FiniteLivedIntangibleAssetsAmortizationExpenseIncreaseDecreaseAbstract
Namespace Prefix:	o_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Represents the amount of increase (decrease) in rental income expected to be recognized from assets, lacking physical substance with a finite life.

No definition available.

Name:	o_FiniteLivedIntangibleAssetsRentalIncomeIncreaseDecrease
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Name:	o_FiniteLivedIntangibleAssetsRentalIncomeIncreaseDecreaseAbstract
Namespace Prefix:	o_
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Balance Type:	na
Period Type:	duration

Represents the amount of increase (decrease) in rental income expected to be recognized after the fifth fiscal year following the latest fiscal year from assets, lacking physical substance with a finite life.

No definition available.

Name:	o_FiniteLivedIntangibleAssetsRentalIncomeIncreaseDecreaseAfterYearFive
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the amount of increase (decrease) in rental income expected to be recognized during the next fiscal year following the latest fiscal year from assets, lacking physical substance with a finite life.

No definition available.

Name:	o_FiniteLivedIntangibleAssetsRentalIncomeIncreaseDecreaseNextTwelveMonths
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the amount of increase (decrease) in rental income expected to be recognized during the fifth fiscal year following the latest fiscal year from assets, lacking physical substance with a finite life.

No definition available.

Name:	o_FiniteLivedIntangibleAssetsRentalIncomeIncreaseDecreaseYearFive
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the amount of increase (decrease) in rental income expected to be recognized during the fourth fiscal year following the latest fiscal year from assets, lacking physical substance with a finite life.

No definition available.

Name:	o_FiniteLivedIntangibleAssetsRentalIncomeIncreaseDecreaseYearFour
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the amount of increase (decrease) in rental income expected to be recognized during the third fiscal year following the latest fiscal year from assets, lacking physical substance with a finite life.

No definition available.

Name:	o_FiniteLivedIntangibleAssetsRentalIncomeIncreaseDecreaseYearThree
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the amount of increase (decrease) in rental income expected to be recognized during the second fiscal year following the latest fiscal year from assets, lacking physical substance with a finite life.

No definition available.

Name:	o_FiniteLivedIntangibleAssetsRentalIncomeIncreaseDecreaseYearTwo
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The increase in amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

No definition available.

Name:	o_IncreaseDecreaseDebtInstrumentUnamortizedDiscountPremium
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the net increase (decrease) to rental income for capitalized above market and below market leases during the period.

No definition available.

Name:	o_NetIncreaseDecreaseToRentalIncomeForCapitalizedAboveMarketAndBelowMarketLeases
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the buildings and improvements recorded as part of the real estate acquisition.

No definition available.

Name:	o_RealEstatePropertiesAcquiredBuildingsAndImprovements
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the Intangible and assumed liabilities recorded as part of the real estate acquisition.

No definition available.

Name:	o_RealEstatePropertiesAcquiredIntangibleAndAssumedLiabilities
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the intangible assets recorded as part of the real estate acquisition.

No definition available.

Name:	o_RealEstatePropertiesAcquiredIntangibleAssets
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the land recorded as part of the real estate acquisition.

No definition available.

Name:	o_RealEstatePropertiesAcquiredLand
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the other assets recorded as part of the real estate acquisition.

No definition available.

Name:	o_RealEstatePropertiesAcquiredOtherAssets
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the estimated fair value of the purchase price allocation.

No definition available.

Name:	o_RealEstatePropertiesAcquiredPurchasePriceAllocationEstimate
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the estimated fair value of the purchase price allocation that was finalized during the period.

No definition available.

Name:	o_RealEstatePropertiesAcquiredPurchasePriceAllocationFinalized
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the direct costs incurred in the acquisition of real estate properties, including legal, accounting and other costs.

No definition available.

Name:	o_RealEstatePropertyAcquisitionsTransactionCosts
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the number of investments in properties that caused any tenant to be 10 percent or more of total assets.

No definition available.

Name:	o_RealEstatePropertyInvestmentsNumberOfInvestmentsThatCausedAnyOneTenantToBeTenPercentOrMoreOfTotalAssets
Namespace Prefix:	o_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The number of new properties and properties under development in which the entity invested during the period.

No definition available.

Name:	o_RealEstatePropertyInvestmentsNumberOfNewPropertiesAndPropertiesUnderDevelopment
Namespace Prefix:	o_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Represents the value of real estate acquired during the period.

No definition available.

Name:	o_RealEstatePropertyInvestmentsValueOfNewProperties
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of re-leasing costs related to real estate investments during the period.

No definition available.

Name:	o_ReLeasingCosts
Namespace Prefix:	o_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 2

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-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(2)

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Area of a real estate property.

No definition available.

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

Name:	us-gaap_BusinessAcquisitionProFormaInformationAbstract
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The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, for the period as if the business combination or combinations had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

Name:	us-gaap_BusinessAcquisitionsProFormaRevenue
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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Amount of liability recognized arising from contingent consideration in a business combination.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 25

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-Name Accounting Standards Codification

-Topic 805

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-Paragraph 1

-Subparagraph b

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Name:	us-gaap_BusinessCombinationContingentConsiderationLiability
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The aggregate costs related to construction and development services during the reporting period.

Name:	us-gaap_ConstructionAndDevelopmentCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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.

No definition available.

Name:	us-gaap_FiniteLivedIntangibleAssetAcquiredInPlaceLeases
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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.

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)

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Name:	us-gaap_FiniteLivedIntangibleAssetOffMarketLeaseFavorableGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

Name:	us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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)(3)

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Name:	us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
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Data Type:	xbrli:monetaryItemType
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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

Name:	us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

Name:	us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

Name:	us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

Name:	us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4613673-111683

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-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.13)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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Period Type:	duration

Including the current and noncurrent portions, the carrying value of notes payable which were initially due after one year or beyond the normal operating cycle, if longer, and which are not otherwise defined in the taxonomy.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16(a))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

-Article 5

Name:	us-gaap_OtherNotesPayable
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Amount of land and buildings and improvements made to real estate investments and capitalized after acquisition for entities with a substantial portion of business acquiring and holding investment real estate.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 970

-SubTopic 360

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-28)

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-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule III)

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-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12

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-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule III

-Article 5

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Amount of increase in real estate investments related to improvements for entities with a substantial portion of business acquiring and holding investment real estate.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule III)

-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

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-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12

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-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule III

-Article 5

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-Name Accounting Standards Codification

-Topic 970

-SubTopic 360

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-28.4)

-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024

Name:	us-gaap_RealEstateImprovements
Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

Name:	us-gaap_RealEstatePropertiesLineItems
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Data Type:	xbrli:stringItemType
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The aggregate revenue from real estate operations during the reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(e))

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-Name Regulation S-X (SX)

-Number 210

-Section 03

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-Article 5

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