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Schedule IV - Mortgage Loans on Real Estate (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Mortgage Loans On Real Estate [Line Items] |  |  |  |  |  |
Face Amount of Mortgages | $ 14,262,000 us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages |  |  |  |  |
Carrying Amount of Mortgages | 10,930,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages | [1],[2] |  |  |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | 118,000 us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans |  |  |  |  |
Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |
Balance at beginning of year | 14,430,000 us-gaap_MortgageLoansOnRealEstate |  | 17,482,000 us-gaap_MortgageLoansOnRealEstate |  | 22,815,000 us-gaap_MortgageLoansOnRealEstate |
New mortgage loans | 7,307,000 us-gaap_MortgageLoansOnRealEstateNewMortgageLoans | [3] | 3,547,000 us-gaap_MortgageLoansOnRealEstateNewMortgageLoans | [3] | 7,344,000 us-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 | 0 us-gaap_MortgageLoansOnRealEstateForeclosures |  | 0 us-gaap_MortgageLoansOnRealEstateForeclosures |  | (338,000)us-gaap_MortgageLoansOnRealEstateForeclosures |
Balance at the close of year | 10,930,000 us-gaap_MortgageLoansOnRealEstate |  | 14,430,000 us-gaap_MortgageLoansOnRealEstate |  | 17,482,000 us-gaap_MortgageLoansOnRealEstate |
Mortgages held for federal income tax purposes | 10,930,000 us-gaap_MortgageLoansOnRealEstateFederalIncomeTaxBasis1 |  | 14,430,000 us-gaap_MortgageLoansOnRealEstateFederalIncomeTaxBasis1 |  | 17,482,000 us-gaap_MortgageLoansOnRealEstateFederalIncomeTaxBasis1 |
Payments to acquire mortgage notes receivable | 7,307,000 us-gaap_PaymentsToAcquireMortgageNotesReceivable |  | 3,547,000 us-gaap_PaymentsToAcquireMortgageNotesReceivable |  | 7,344,000 us-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 | 0 us-gaap_MortgageLoansOnRealEstatePriorLiens1 / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nnn_ParamusNjMember |  |  |  |  |
Face Amount of Mortgages | 6,000,000 us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nnn_ParamusNjMember |  |  |  |  |
Carrying Amount of Mortgages | 3,725,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nnn_ParamusNjMember | [1] |  |  |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | 0 us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nnn_ParamusNjMember |  |  |  |  |
Des Moines, IA |  |  |  |  |  |
Mortgage Loans On Real Estate [Line Items] |  |  |  |  |  |
Prior Liens | 0 us-gaap_MortgageLoansOnRealEstatePriorLiens1 / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nnn_DesMoinesIaMember |  |  |  |  |
Face Amount of Mortgages | 400,000 us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nnn_DesMoinesIaMember |  |  |  |  |
Carrying Amount of Mortgages | 118,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nnn_DesMoinesIaMember | [1] |  |  |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | 118,000 us-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 | 0 us-gaap_MortgageLoansOnRealEstatePriorLiens1 / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nnn_MilfordCtMember |  |  |  |  |
Face Amount of Mortgages | 1,550,000 us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nnn_MilfordCtMember |  |  |  |  |
Carrying Amount of Mortgages | 1,550,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nnn_MilfordCtMember | [1] |  |  |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | 0 us-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 | 0 us-gaap_MortgageLoansOnRealEstatePriorLiens1 / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nnn_MarlowHeightsMDMember |  |  |  |  |
Face Amount of Mortgages | 750,000 us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nnn_MarlowHeightsMDMember |  |  |  |  |
Carrying Amount of Mortgages | 750,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nnn_MarlowHeightsMDMember | [1] |  |  |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | 0 us-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 | 0 us-gaap_MortgageLoansOnRealEstatePriorLiens1 / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nnn_HillmanMIMember |  |  |  |  |
Face Amount of Mortgages | 62,000 us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nnn_HillmanMIMember |  |  |  |  |
Carrying Amount of Mortgages | 62,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nnn_HillmanMIMember | [1] |  |  |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | 0 us-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 | 0 us-gaap_MortgageLoansOnRealEstatePriorLiens1 / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nnn_A4PropertiesInFlAndGaMember |  |  |  |  |
Face Amount of Mortgages | 5,500,000 us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nnn_A4PropertiesInFlAndGaMember |  |  |  |  |
Carrying Amount of Mortgages | 4,725,000 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nnn_A4PropertiesInFlAndGaMember | [1] |  |  |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 0 us-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.

X
- Definition Stated maturity date of the mortgage loan receivable on real estate, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition Total carrying amount of mortgage loans as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.6) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition The carrying amount of the outstanding balance due under the mortgage loan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition The amount of principal collected on mortgage loans on real estate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.6) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition Amount of the contractual principal due at the origination of the mortgage loan (face amount). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition Amount of the federal income tax basis of mortgage loans on real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.8) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition Total amount of new mortgage loans on real estate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.6) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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