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At-the-Market (ATM) Program (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2015
Proceeds from At-the-Market (ATM) program |  | $ 36,348
ATM |  |
Shares authorized | 12,000,000 |
Shares issued pursuant to at-the-market program, net (in shares) |  | 714,301
Proceeds from At-the-Market (ATM) program |  | $ 36,300

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- Definition At The Market Equity Distribution Program, Authorized Shares The number of shares authorized by an entity's Board of Directors under their At-the-market equity distribution program. + References No definition available. + Details
Name: | o_AtMarketEquityDistributionProgramAuthorizedShares
Namespace Prefix: | o_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash inflow from the At-the_market stock purchase program. + References No definition available. + Details
Name: | o_ProceedsFromAtMarketStockPurchaseProgram
Namespace Prefix: | o_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Number of Shares of stock issued during the period from the at-the-market program. + References No definition available. + Details
Name: | o_StockIssuedDuringPeriodSharesAtTheMarketProgram
Namespace Prefix: | o_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementClassOfStockAxis=o_AtMarketProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |