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Investments in Real Estate - Investments in Existing Properties (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Investments in real estate properties |  |
Improvements | $ 65,373,623 |
Investments in Existing Properties |  |
Investments in real estate properties |  |
Improvements | 17,900,000 | $ 17,900,000
Re-leasing costs | 2,100,000 | 3,900,000
Recurring capital expenditures | 801,000 | 1,100,000
Nonrecurring building improvements | $ 15,000,000.0 | $ 12,900,000

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

X
- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column D)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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Balance Type: | debit
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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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