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Investments in Real Estate - Investments in Existing Properties (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Investments in real estate properties |  |  |
Capitalized costs on existing portfolio | $ 8,708 | $ 23,536 | $ 25,350
Investments in existing properties |  |  |
Investments in real estate properties |  |  |
Capitalized costs on existing portfolio | 7,000 | 17,900 |
Re-leasing costs | 1,800 | 2,100 |
Recurring capital expenditures | 198 | 801 |
Nonrecurring building improvements | $ 5,000 | $ 15,000 |

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- Definition Amount of nonrecurring building real estate improvements related to real estate investments during the period. + References No definition available. + Details
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Namespace Prefix: | o_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of re-leasing costs related to real estate investments during the period. + References No definition available. + Details
Name: | o_ReLeasingCosts
Namespace Prefix: | o_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of recurring capital expenditures real estate improvements related to real estate investments during the period. + References No definition available. + Details
Name: | o_RecurringCapitalExpendituresRealEstateImprovements
Namespace Prefix: | o_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The cash outflow for acquisition of or capital improvements to properties held for investment (operating, managed, leased) or for use. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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