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Impairments (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) property | Sep. 30, 2016 USD ($) property | Sep. 30, 2017 USD ($) property | Sep. 30, 2016 USD ($) property
Impairments |  |  |  |
Total provisions for impairment | $ | $ 365,000 | $ 8,800,000 | $ 8,100,000 | $ 17,000,000
Number of impaired properties sold | 3 | 15 | 10 | 29
Number of impaired properties held-for-sale |  | 1 | 1 | 1
Number of impaired properties held-for-investment |  | 2 | 6 | 2

X
- Definition The number of impaired properties held-for-investment. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition The number of impaired properties held for sale. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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X
- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2611-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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