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Schedule IV - Mortgage Loans on Real Estate (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mortgage Loans On Real Estate [Line Items]      
Face Amount of Mortgages $ 14,262,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages    
Carrying Amount of Mortgages 10,930,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages [1],[2]    
Principal Amount of Loans Subject to Delinquent Principal or Interest 118,000us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans    
Movement in Mortgage Loans on Real Estate [Roll Forward]      
Balance at beginning of year 14,430,000us-gaap_MortgageLoansOnRealEstate 17,482,000us-gaap_MortgageLoansOnRealEstate 22,815,000us-gaap_MortgageLoansOnRealEstate
New mortgage loans 7,307,000us-gaap_MortgageLoansOnRealEstateNewMortgageLoans [3] 3,547,000us-gaap_MortgageLoansOnRealEstateNewMortgageLoans [3] 7,344,000us-gaap_MortgageLoansOnRealEstateNewMortgageLoans [3]
Collections of principal (10,807,000)us-gaap_MortgageLoansOnRealEstateCollectionsOfPrincipal (6,599,000)us-gaap_MortgageLoansOnRealEstateCollectionsOfPrincipal (12,339,000)us-gaap_MortgageLoansOnRealEstateCollectionsOfPrincipal
Foreclosures 0us-gaap_MortgageLoansOnRealEstateForeclosures 0us-gaap_MortgageLoansOnRealEstateForeclosures (338,000)us-gaap_MortgageLoansOnRealEstateForeclosures
Balance at the close of year 10,930,000us-gaap_MortgageLoansOnRealEstate 14,430,000us-gaap_MortgageLoansOnRealEstate 17,482,000us-gaap_MortgageLoansOnRealEstate
Mortgages held for federal income tax purposes 10,930,000us-gaap_MortgageLoansOnRealEstateFederalIncomeTaxBasis1 14,430,000us-gaap_MortgageLoansOnRealEstateFederalIncomeTaxBasis1 17,482,000us-gaap_MortgageLoansOnRealEstateFederalIncomeTaxBasis1
Payments to acquire mortgage notes receivable 7,307,000us-gaap_PaymentsToAcquireMortgageNotesReceivable 3,547,000us-gaap_PaymentsToAcquireMortgageNotesReceivable 7,344,000us-gaap_PaymentsToAcquireMortgageNotesReceivable
Paramus, NJ      
Mortgage Loans On Real Estate [Line Items]      
Interest Rate 9.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_ParamusNjMember		    
Maturity Date Feb. 01, 2022 [4]    
Prior Liens 0us-gaap_MortgageLoansOnRealEstatePriorLiens1
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_ParamusNjMember		    
Face Amount of Mortgages 6,000,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_ParamusNjMember		    
Carrying Amount of Mortgages 3,725,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_ParamusNjMember		 [1]    
Principal Amount of Loans Subject to Delinquent Principal or Interest 0us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_ParamusNjMember		    
Des Moines, IA      
Mortgage Loans On Real Estate [Line Items]      
Prior Liens 0us-gaap_MortgageLoansOnRealEstatePriorLiens1
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_DesMoinesIaMember		    
Face Amount of Mortgages 400,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_DesMoinesIaMember		    
Carrying Amount of Mortgages 118,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_DesMoinesIaMember		 [1]    
Principal Amount of Loans Subject to Delinquent Principal or Interest 118,000us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_DesMoinesIaMember		    
Milford, CT      
Mortgage Loans On Real Estate [Line Items]      
Interest Rate 7.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_MilfordCtMember		    
Maturity Date Jun. 30, 2016 [5]    
Prior Liens 0us-gaap_MortgageLoansOnRealEstatePriorLiens1
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_MilfordCtMember		    
Face Amount of Mortgages 1,550,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_MilfordCtMember		    
Carrying Amount of Mortgages 1,550,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_MilfordCtMember		 [1]    
Principal Amount of Loans Subject to Delinquent Principal or Interest 0us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_MilfordCtMember		    
Marlow Heights, MD      
Mortgage Loans On Real Estate [Line Items]      
Interest Rate 7.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_MarlowHeightsMDMember		    
Maturity Date May 14, 2016 [5]    
Prior Liens 0us-gaap_MortgageLoansOnRealEstatePriorLiens1
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_MarlowHeightsMDMember		    
Face Amount of Mortgages 750,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_MarlowHeightsMDMember		    
Carrying Amount of Mortgages 750,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_MarlowHeightsMDMember		 [1]    
Principal Amount of Loans Subject to Delinquent Principal or Interest 0us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_MarlowHeightsMDMember		    
Hillman, MI      
Mortgage Loans On Real Estate [Line Items]      
Interest Rate 7.50%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_HillmanMIMember		    
Maturity Date Jun. 01, 2017 [5]    
Prior Liens 0us-gaap_MortgageLoansOnRealEstatePriorLiens1
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_HillmanMIMember		    
Face Amount of Mortgages 62,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_HillmanMIMember		    
Carrying Amount of Mortgages 62,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_HillmanMIMember		 [1]    
Principal Amount of Loans Subject to Delinquent Principal or Interest 0us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_HillmanMIMember		    
4 properties in FL and GA      
Mortgage Loans On Real Estate [Line Items]      
Interest Rate 6.25%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_A4PropertiesInFlAndGaMember		    
Maturity Date Jun. 01, 2015 [6]    
Prior Liens 0us-gaap_MortgageLoansOnRealEstatePriorLiens1
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_A4PropertiesInFlAndGaMember		    
Face Amount of Mortgages 5,500,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_A4PropertiesInFlAndGaMember		    
Carrying Amount of Mortgages 4,725,000us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_A4PropertiesInFlAndGaMember		 [1]    
Principal Amount of Loans Subject to Delinquent Principal or Interest $ 0us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nnn_A4PropertiesInFlAndGaMember		    
[1] Mortgages held by NNN and its subsidiaries for federal income tax purposes for the years ended December 31, 2014, 2013 and 2012 were $10,930, $14,430, and $17,482, respectively.
[2] The following shows the changes in the carrying amounts of mortgage loans during the years: 2014 2013 2012 Balance at beginning of year$14,430 $17,482 $22,815 New mortgage loans7,307 (g) 3,547 (g) 7,344 (g) Deductions during the year: Collections of principal(10,807) (6,599) (12,339) Foreclosures— — (338) Balance at the close of year$10,930 $14,430 $17,482
[3] Mortgages totaling $7,307, $3,547, and $7,344, were accepted in connection with real estate transactions for the year ended December 31, 2014, 2013 and 2012, respectively.
[4] Principal and interest is payable at level amounts over the life of the loan.
[5] Interest only payments are due monthly. Principal is due at maturity.
[6] Interest only payments are due monthly. Periodic principal payments are due over the course of the loan based on specific terms outlined in the loan agreement, with the remaining principal balance due at maturity.