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Impairments - Narrative (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($) property | Mar. 31, 2018 USD ($) property
Property, Plant and Equipment [Abstract] |  |
Provisions for impairment | $ | $ 4,672 | $ 14,221
Number of impaired properties held for sale | 3 |
Number of impaired properties sold | 4 | 9
Number of impaired properties held for investment |  | 1

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- Definition The number of impaired properties held-for-investment. + 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 number of impaired properties held for sale. + References No definition available. + Details
Name: | o_ImpairedPropertiesHeldForSaleNumber
Namespace Prefix: | o_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of impaired properties sold. + References No definition available. + Details
Name: | o_ImpairedPropertiesSoldNumber
Namespace Prefix: | o_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 + Details
Name: | us-gaap_ImpairmentOfRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration