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Operating Leases (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 item | Dec. 31, 2013 | Dec. 31, 2012
Operating leases |  |  |
Number of properties | 4,327 us-gaap_NumberOfRealEstateProperties |  |
Number of U.S. states where properties are owned | 49 us-gaap_NumberOfStatesInWhichEntityOperates |  |
Single-tenant properties | 4,308 o_NumberOfOwnedSingleTenantProperties |  |
Single-tenant properties (as a percent) | 99.60%o_SingleTenantPropertiesPercentage |  |
Multi-tenant properties | 19 o_NumberOfOwnedMultiTenantProperties |  |
Vacant properties available for lease or sale | 70 o_NumberOfVacantPropertiesAvailableForLeaseOrSale |  |
Percentage rents | $ 3,600,000 us-gaap_PercentageRent | $ 2,900,000 us-gaap_PercentageRent | $ 2,100,000 us-gaap_PercentageRent
Percentage rents including amounts recorded to discontinued operations | 35,000 o_PercentageRentsDiscontinuedOperations | 104,000 o_PercentageRentsDiscontinuedOperations | 163,000 o_PercentageRentsDiscontinuedOperations
Minimum future annual rents to be received on the operating leases |  |  |
2015 | 929,507,000 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent |  |
2016 | 917,651,000 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears |  |
2017 | 898,584,000 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears |  |
2018 | 873,474,000 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears |  |
2019 | 817,658,000 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears |  |
Thereafter | 5,376,267,000 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter |  |
Total | $ 9,813,141,000 us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable |  |
Crest Net Lease, Inc. (Crest) |  |  |
Operating leases |  |  |
Number of properties | 2 us-gaap_NumberOfRealEstateProperties / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |

X
- Definition The number of real estate properties owned by the entity, which are multi-tenant properties. + References No definition available. + Details
Name: | o_NumberOfOwnedMultiTenantProperties
Namespace Prefix: | o_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of real estate properties owned by the entity, which are single-tenant properties. + References No definition available. + Details
Name: | o_NumberOfOwnedSingleTenantProperties
Namespace Prefix: | o_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of real estate properties owned by the entity, which are not occupied and are available for lease or sale. + References No definition available. + Details
Name: | o_NumberOfVacantPropertiesAvailableForLeaseOrSale
Namespace Prefix: | o_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition This element represents the rental revenue earned during the period from lessee-operators recorded to discontinued operations, generally in excess of a base amount. + References No definition available. + Details
Name: | o_PercentageRentsDiscontinuedOperations
Namespace Prefix: | o_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The percentage of real estate properties owned by the entity, which are single-tenant properties. + References No definition available. + Details
Name: | o_SingleTenantPropertiesPercentage
Namespace Prefix: | o_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Future minimum rental payments in aggregate as of the balance sheet date under operating leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
Name: | us-gaap_OperatingLeasesFutureMinimumPaymentsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Future rental payments receivable within one year of the balance sheet date under an operating lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
Name: | us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Future rental payments receivable within the fifth year from the balance sheet date under an operating lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
Name: | us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Future rental payments receivable within the fourth year from the balance sheet date under an operating lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
Name: | us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Future rental payments receivable within the third year from the balance sheet date under an operating lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
Name: | us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Future rental payments receivable within the second year from the balance sheet date under an operating lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
Name: | us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Future minimum lease payments receivable under operating leases for periods greater than five years following the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
Name: | us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents the rental revenue earned during the period from lessee-operators based on revenues generated in their operations, generally in excess of a base amount. Such rental revenue is generally stipulated in the lease agreement, usually will provide for a fixed percentage of revenue to be paid as additional (or possibly only) rent due the lessor, and may be based on gross revenues, net revenues, or multiple variations thereof. Percentage rent is often required under leases with retail outlets located on premises owned by hoteliers, cruise lines, others in the hospitality industry, and shopping mall operators, among others. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_PercentageRent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=us-gaap_SubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |