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Notes Payable (Detail) (USD $)
12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Jul. 31, 2013
Jun. 30, 2014
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2012
Debt instrument            
Total principal amount $ 3,200,000,000us-gaap_NotesPayable       $ 3,800,000,000us-gaap_NotesPayable  
Unamortized original issuance discounts (15,000,000)us-gaap_DebtInstrumentUnamortizedDiscount       (15,000,000)us-gaap_DebtInstrumentUnamortizedDiscount  
Notes payable, net 3,185,480,000o_NotesPayableNetOfUnamortizedDiscount       3,785,372,000o_NotesPayableNetOfUnamortizedDiscount  
Repayments of Notes Payable 100,000,000us-gaap_RepaymentsOfNotesPayable          
Proceeds from Issuance of Debt 70,000,000us-gaap_ProceedsFromIssuanceOfDebt          
Maturity of notes and bonds payable            
2015         150,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths  
2016         275,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo  
2017         175,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree  
2018         350,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour  
2019         550,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive  
Thereafter         2,300,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive  
Totals         3,800,000,000us-gaap_LongTermDebt  
Minimum            
Debt instrument            
Interest rate (as a percent) 2.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
      2.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Effective yield (as a percent) 2.40%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
      2.20%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Maximum            
Debt instrument            
Interest rate (as a percent) 6.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
      6.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Effective yield (as a percent) 9.20%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
      9.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
5.5% notes, issued in November 2003 and due in November 2015            
Debt instrument            
Total principal amount 150,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueNovember2015Member
      150,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueNovember2015Member
 
Interest rate (as a percent) 5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueNovember2015Member
      5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueNovember2015Member
 
5.95% notes, issued in September 2006 and due in September 2016            
Debt instrument            
Total principal amount 275,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueSeptember2016Member
      275,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueSeptember2016Member
 
Interest rate (as a percent) 5.95%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueSeptember2016Member
      5.95%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueSeptember2016Member
 
5.375% notes, issued in September 2005 and due in September 2017            
Debt instrument            
Total principal amount 175,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueSeptember2017Member
      175,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueSeptember2017Member
 
Interest rate (as a percent) 5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueSeptember2017Member
      5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueSeptember2017Member
 
2.0% notes, issued in October 2012 and due in January 2018            
Debt instrument            
Total principal amount 350,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueJanuary2018Member
      350,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueJanuary2018Member
 
Interest rate (as a percent) 2.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueJanuary2018Member
      2.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueJanuary2018Member
 
6.75% notes, issued in September 2007 and due in August 2019            
Debt instrument            
Total principal amount 550,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueAugust2019Member
      550,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueAugust2019Member
 
Interest rate (as a percent) 6.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueAugust2019Member
      6.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueAugust2019Member
 
5.75% notes, issued in June 2010 and due in January 2021            
Debt instrument            
Total principal amount 250,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueJanuary2021Member
      250,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueJanuary2021Member
 
Interest rate (as a percent) 5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueJanuary2021Member
      5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueJanuary2021Member
 
3.25% notes, issued in October 2012 and due in October 2022            
Debt instrument            
Total principal amount 450,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueOctober2022Member
      450,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueOctober2022Member
 
Interest rate (as a percent) 3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueOctober2022Member
      3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueOctober2022Member
 
4.65% notes, issued in July 2013 and due in August 2023            
Debt instrument            
Total principal amount 750,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueAugust2023Member
750,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueAugust2023Member
    750,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueAugust2023Member
 
Interest rate (as a percent) 4.65%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueAugust2023Member
4.65%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueAugust2023Member
    4.65%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueAugust2023Member
 
Percentage price paid to the investor   99.775%o_PercentagePriceToInvestor
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueAugust2023Member
       
Effective yield (as a percent)   4.678%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueAugust2023Member
       
Proceeds from Issuance of Debt   741,400,000us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueAugust2023Member
       
3.875% notes, issued in June 2014 and due in July 2024            
Debt instrument            
Total principal amount     350,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueJuly2024Member
  350,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueJuly2024Member
 
Interest rate (as a percent)     3.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueJuly2024Member
  3.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueJuly2024Member
 
Percentage price paid to the investor     99.956%o_PercentagePriceToInvestor
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueJuly2024Member
     
Effective yield (as a percent)     3.88%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueJuly2024Member
     
Proceeds from Issuance of Debt     346,700,000us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueJuly2024Member
     
4.125% notes, issued in September 2014 and due in October 2026            
Debt instrument            
Total principal amount         250,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueOctober2026Member
 
Interest rate (as a percent)       4.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueOctober2026Member
4.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueOctober2026Member
 
Issuance of Debt       250,000,000us-gaap_DebtInstrumentIncreaseDecreaseForPeriodNet
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueOctober2026Member
   
Percentage price paid to the investor       99.499%o_PercentagePriceToInvestor
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueOctober2026Member
   
Effective yield (as a percent)       4.178%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueOctober2026Member
   
Proceeds from Issuance of Debt       246,400,000us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_LongtermDebtTypeAxis
= o_NotesPayableDueOctober2026Member
   
5.875% bonds due in March 2035            
Debt instrument            
Total principal amount 250,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= o_BondsPayableDueMarch2035Member
      250,000,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= o_BondsPayableDueMarch2035Member
 
Interest rate (as a percent) 5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= o_BondsPayableDueMarch2035Member
      5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= o_BondsPayableDueMarch2035Member
 
5.875% bonds, issued in June 2011 and due in March 2035            
Debt instrument            
Total principal amount 150,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= o_BondsPayableDueMarch2035SecondIssuanceJune2011Member
      150,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= o_BondsPayableDueMarch2035SecondIssuanceJune2011Member
 
5.875% bonds, issued in March 2005 and due in March 2035            
Debt instrument            
Total principal amount 100,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= o_BondsPayableDueMarch2035FirstIssuanceMarch2005Member
      100,000us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= o_BondsPayableDueMarch2035FirstIssuanceMarch2005Member
 
Notes and bonds payable            
Debt instrument            
Weighted average interest rate         4.80%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= o_NotesAndBondsPayableMember
 
Weighted average remaining years until maturity         7 years 2 months 12 days  
Interest incurred on notes and bonds $ 138,900,000us-gaap_InterestExpenseDebt
/ us-gaap_LongtermDebtTypeAxis
= o_NotesAndBondsPayableMember
      $ 166,500,000us-gaap_InterestExpenseDebt
/ us-gaap_LongtermDebtTypeAxis
= o_NotesAndBondsPayableMember
$ 110,400,000us-gaap_InterestExpenseDebt
/ us-gaap_LongtermDebtTypeAxis
= o_NotesAndBondsPayableMember
Notes and bonds payable | Minimum            
Debt instrument            
Debt service coverage ratio         1.5o_DebtInstrumentCovenantDebtServiceCoverageRatio
/ us-gaap_LongtermDebtTypeAxis
= o_NotesAndBondsPayableMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Total unencumbered assets as a percentage of outstanding unsecured debt         150.00%o_DebtInstrumentCovenantAggregateUnencumberedAssetsAsPercentageOfOutstandingUnsecuredDebt
/ us-gaap_LongtermDebtTypeAxis
= o_NotesAndBondsPayableMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Notes and bonds payable | Maximum            
Debt instrument            
Debt to total adjusted assets ratio (as a percent)         60.00%o_DebtInstrumentCovenantDebtToTotalAdjustedAssetsRatio
/ us-gaap_LongtermDebtTypeAxis
= o_NotesAndBondsPayableMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Secured debt to total adjusted assets ratio (as a percent)         40.00%o_DebtInstrumentCovenantSecuredDebtToTotalAdjustedAssetsRatio
/ us-gaap_LongtermDebtTypeAxis
= o_NotesAndBondsPayableMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember