Total of (1) improvements, (2) held-for-sale, (3) land and buildings, (4) construction-in-process, and (5) other real estate investments which are considered inventory due to being held for sale or disposition.

Name:	o_NetRealEstate
Namespace Prefix:	o
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Number of industry and activity segments in which all properties are incorporated.

+ Details

Name:	o_NumberOfIndustryAndActivitySegmentsIncludingPropertiesOwnedByCrestThatAreGroupedTogetherAsSegment
Namespace Prefix:	o
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Other revenue in period not otherwise previously specified as rental revenue. Element excludes operating lease revenue, minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

+ Details

Name:	o_Other
Namespace Prefix:	o
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate carrying amounts, as of the balance sheet date, of corporate assets not separately disclosed in the balance sheet.

+ Details

Name:	o_OtherCorporateAssets
Namespace Prefix:	o
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 7

-Section 03

-Paragraph 12

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Topic 210

-SubTopic 10

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

-Section S99

-Name Accounting Standards Codification

-Publisher FASB

-Paragraph 1

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Concepts (CON)

-Number 6

-Paragraph 25

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 18

-Article 5

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.18)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_Assets
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph e

-Clause 1

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 43

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph l

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 34

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6905597&loc=d3e13816-109267

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 72

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 42, 45

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph ((a)(1),(b))

-URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

+ Details

Name:	us-gaap_IntangibleAssetsNetExcludingGoodwill
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 19

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453417&loc=d3e39896-112707

+ Details

Name:	us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 5

-Section 03

-Paragraph 1

Reference 2: 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)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

+ Details

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_SegmentReportingAbstract
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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.

+ Details

Name:	us-gaap_SegmentReportingAssetReconcilingItemLineItems
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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.

+ Details

Name:	us-gaap_SegmentReportingRevenueReconcilingItemLineItems
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Segment Information [Abstract]
Number of group or industry activity segments reported	39		39
Segment Reporting, Asset Reconciling Item [Line Items]
Net real estate assets	$ 4,018,076		$ 4,018,076		$ 3,404,878
Goodwill	17,206		17,206		17,206
Other corporate assets	89,368		89,368		87,285
Total assets	4,274,774		4,274,774		3,535,590
Segment Reporting, Revenue Reconciling Item [Line Items]
Rental revenue	106,808	86,749	306,746	251,237
Other revenue	488	84	886	385
Total revenue	107,296	86,833	307,632	251,622
Automotive Service [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Net real estate assets	104,676		104,676		107,507
Goodwill	1,338		1,338		1,338
Segment Reporting, Revenue Reconciling Item [Line Items]
Rental revenue	3,979	4,018	12,078	11,907
Automotive Tire Services [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Net real estate assets	191,071		191,071		195,883
Intangible assets	544		544		588
Segment Reporting, Revenue Reconciling Item [Line Items]
Rental revenue	5,507	5,476	17,486	16,476
Beverages [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Net real estate assets	308,512		308,512		302,159
Intangible assets	3,635		3,635		0
Segment Reporting, Revenue Reconciling Item [Line Items]
Rental revenue	5,960	4,838	17,472	5,158
Child Care [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Net real estate assets	67,682		67,682		72,935
Goodwill	5,353		5,353		5,353
Segment Reporting, Revenue Reconciling Item [Line Items]
Rental revenue	5,547	5,670	16,713	16,630
Convenience Stores [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Net real estate assets	695,711		695,711		711,667
Goodwill	2,074		2,074		2,074
Segment Reporting, Revenue Reconciling Item [Line Items]
Rental revenue	19,512	14,340	58,355	42,775
Drug Stores [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Net real estate assets	155,223		155,223		143,739
Intangible assets	14,708		14,708		5,939
Segment Reporting, Revenue Reconciling Item [Line Items]
Rental revenue	4,017	3,479	11,777	10,343
Health and fitness [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Net real estate assets	292,734		292,734		220,653
Intangible assets	1,601		1,601		1,708
Segment Reporting, Revenue Reconciling Item [Line Items]
Rental revenue	6,482	5,833	18,978	17,587
Restaurants - casual dining [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Net real estate assets	476,004		476,004		487,141
Goodwill	2,461		2,461		2,461
Segment Reporting, Revenue Reconciling Item [Line Items]
Rental revenue	11,611	11,337	34,692	34,169
Restaurants - quick service [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Net real estate assets	279,744		279,744		247,475
Intangible assets	4,180		4,180		0
Goodwill	1,318		1,318		1,318
Segment Reporting, Revenue Reconciling Item [Line Items]
Rental revenue	6,767	6,370	19,961	20,055
Sporting Goods [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Net real estate assets	81,005		81,005		82,966
Intangible assets	5,439		5,439		5,786
Segment Reporting, Revenue Reconciling Item [Line Items]
Rental revenue	2,791	2,232	8,294	6,494
Theaters [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Net real estate assets	386,693		386,693		281,072
Intangible assets	32,338		32,338		1,579
Segment Reporting, Revenue Reconciling Item [Line Items]
Rental revenue	9,779	7,563	25,715	22,690
Transportation Services [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Net real estate assets	96,966		96,966		4,961
Intangible assets	22,454		22,454		0
Segment Reporting, Revenue Reconciling Item [Line Items]
Rental revenue	2,298	187	5,146	562
Wholesale Clubs [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Net real estate assets	155,979		155,979		0
Segment Reporting, Revenue Reconciling Item [Line Items]
Rental revenue	34	0	34	0
Non-Reportable Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Net real estate assets	726,076		726,076		546,720
Intangible assets	65,225		65,225		10,621
Goodwill	4,662		4,662		4,662
Segment Reporting, Revenue Reconciling Item [Line Items]
Rental revenue	$ 22,524	$ 15,406	$ 60,045	$ 46,391