The percentage of real estate properties owned by the entity, which are single-tenant properties.

No definition available.

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

- References

No definition available.

+ Details

Name:	us-gaap_LessorOperatingLeaseDescriptionAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfRealEstateProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of operating lease income from variable lease payments paid and payable to lessor, excluding amount included in measurement of lease receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 50
-Paragraph 6A
-URI http://asc.fasb.org/extlink&oid=118952077&loc=SL77927221-108306

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919372-209981

+ Details

Name:	us-gaap_OperatingLeaseVariableLeaseIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=o_SingleTenantPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=o_PropertyAvailableForLeaseOrSaleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Operating Leases - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
Operating Leases - Narrative (Details) $ in Thousands	Sep. 30, 2019 USD ($) state property	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) state property	Sep. 30, 2018 USD ($)
Operating Leases
Number of properties owned	5,964		5,964
Number of U.S. states where properties are owned (states) \| state	49		49
Percentage rent received \| $	$ 407	$ 454	$ 4,500	$ 4,300
Single-tenant properties
Operating Leases
Number of properties owned	5,934		5,934
Single-tenant properties as percentage of total properties	99.50%		99.50%
Properties available for lease or sale
Operating Leases
Number of properties owned	102		102