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Mortgages Payable (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Outstanding Principal Balance | $ 26,339,000 us-gaap_SecuredDebt |  | $ 9,475,000 us-gaap_SecuredDebt |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |
Total | 26,339,000 us-gaap_SecuredDebt |  | 9,475,000 us-gaap_SecuredDebt |
Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Carrying Value of Encumbered Asset(s) | 48,210,000 nnn_CarryingValueOfPropertiesSecuringMortgagesPayable / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [1] |  |
Outstanding Principal Balance | 26,339,000 us-gaap_SecuredDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  | 9,475,000 us-gaap_SecuredDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |
2015 | 1,870,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  |  |
2016 | 7,514,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  |  |
2017 | 3,441,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  |  |
2018 | 710,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  |  |
2019 | 688,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  |  |
Thereafter | 12,116,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  |  |
Total | 26,339,000 us-gaap_SecuredDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  | 9,475,000 us-gaap_SecuredDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |
December 2001 - $623 | Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Initial Balance | 623,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = nnn_December2001623Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3] |  |
Interest Rate | 9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nnn_December2001623Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3] |  |
Carrying Value of Encumbered Asset(s) | 0 nnn_CarryingValueOfPropertiesSecuringMortgagesPayable / us-gaap_DebtInstrumentAxis = nnn_December2001623Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [1],[2],[3] |  |
Outstanding Principal Balance | 0 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_December2001623Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3] | 27,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_December2001623Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3]
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |
Total | 0 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_December2001623Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3] | 27,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_December2001623Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3]
December 2001 - $698 | Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Initial Balance | 698,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = nnn_December2001698Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3] |  |
Interest Rate | 9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nnn_December2001698Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3] |  |
Carrying Value of Encumbered Asset(s) | 868,000 nnn_CarryingValueOfPropertiesSecuringMortgagesPayable / us-gaap_DebtInstrumentAxis = nnn_December2001698Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [1],[2],[3] |  |
Outstanding Principal Balance | 223,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_December2001698Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3] | 263,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_December2001698Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3]
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |
Total | 223,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_December2001698Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3] | 263,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_December2001698Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3]
December 2001 - $485 | Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Initial Balance | 485,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = nnn_December2001485Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3] |  |
Interest Rate | 9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nnn_December2001485Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3] |  |
Carrying Value of Encumbered Asset(s) | 841,000 nnn_CarryingValueOfPropertiesSecuringMortgagesPayable / us-gaap_DebtInstrumentAxis = nnn_December2001485Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [1],[2],[3] |  |
Outstanding Principal Balance | 116,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_December2001485Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3] | 136,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_December2001485Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3]
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |
Total | 116,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_December2001485Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3] | 136,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_December2001485Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3]
February 2004 | Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Initial Balance | 6,952,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = nnn_February20046952Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3] |  |
Interest Rate | 6.90%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nnn_February20046952Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3] |  |
Carrying Value of Encumbered Asset(s) | 10,554,000 nnn_CarryingValueOfPropertiesSecuringMortgagesPayable / us-gaap_DebtInstrumentAxis = nnn_February20046952Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [1],[2],[3] |  |
Outstanding Principal Balance | 1,577,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_February20046952Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3] | 2,257,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_February20046952Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3]
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |
Total | 1,577,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_February20046952Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3] | 2,257,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_February20046952Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3]
March 2005 | Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Initial Balance | 1,015,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = nnn_March20051015Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3] |  |
Interest Rate | 8.14%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nnn_March20051015Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3] |  |
Carrying Value of Encumbered Asset(s) | 1,245,000 nnn_CarryingValueOfPropertiesSecuringMortgagesPayable / us-gaap_DebtInstrumentAxis = nnn_March20051015Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [1],[2],[3] |  |
Outstanding Principal Balance | 222,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_March20051015Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3] | 335,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_March20051015Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3]
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |
Total | 222,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_March20051015Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3] | 335,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_March20051015Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3]
June 2012 | Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Initial Balance | 6,850,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = nnn_MortgagePayableIssuedJune2012Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3],[4] |  |
Interest Rate | 5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nnn_MortgagePayableIssuedJune2012Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3],[4] |  |
Carrying Value of Encumbered Asset(s) | 8,529,000 nnn_CarryingValueOfPropertiesSecuringMortgagesPayable / us-gaap_DebtInstrumentAxis = nnn_MortgagePayableIssuedJune2012Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [1],[2],[3],[4] |  |
Outstanding Principal Balance | 6,180,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_MortgagePayableIssuedJune2012Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3],[4] | 6,457,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_MortgagePayableIssuedJune2012Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3],[4]
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |
Total | 6,180,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_MortgagePayableIssuedJune2012Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3],[4] | 6,457,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_MortgagePayableIssuedJune2012Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3],[4]
September 2014 | Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Initial Balance | 2,957,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = nnn_MortgagePayableIssuedSeptember2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3],[4] |  |
Interest Rate | 6.40%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nnn_MortgagePayableIssuedSeptember2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3],[4] |  |
Carrying Value of Encumbered Asset(s) | 3,797,000 nnn_CarryingValueOfPropertiesSecuringMortgagesPayable / us-gaap_DebtInstrumentAxis = nnn_MortgagePayableIssuedSeptember2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [1],[2],[3],[4] |  |
Outstanding Principal Balance | 2,922,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_MortgagePayableIssuedSeptember2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3],[4] | 0 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_MortgagePayableIssuedSeptember2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3],[4]
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |
Total | 2,922,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_MortgagePayableIssuedSeptember2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3],[4] | 0 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_MortgagePayableIssuedSeptember2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3],[4]
November 2014 | Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Initial Balance | 15,151,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = nnn_MortgagePayableIssuedNovember2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3],[4] |  |
Interest Rate | 5.23%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = nnn_MortgagePayableIssuedNovember2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3],[4] |  |
Carrying Value of Encumbered Asset(s) | 22,376,000 nnn_CarryingValueOfPropertiesSecuringMortgagesPayable / us-gaap_DebtInstrumentAxis = nnn_MortgagePayableIssuedNovember2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [1],[2],[3],[4] |  |
Outstanding Principal Balance | 15,099,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_MortgagePayableIssuedNovember2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3],[4] | 0 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_MortgagePayableIssuedNovember2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3],[4]
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |
Total | $ 15,099,000 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_MortgagePayableIssuedNovember2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3],[4] | $ 0 us-gaap_SecuredDebt / us-gaap_DebtInstrumentAxis = nnn_MortgagePayableIssuedNovember2014Member / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | [2],[3],[4]
[1] | Each loan is secured by a first mortgage lien on certain of the Properties. The carrying values of the assets are as of December 31, 2014
[2] | Monthly payments include interest and principal, if any; the balance is due at maturity.
[3] | Date entered represents the date that NNN acquired real estate subject to a mortgage securing a loan.
[4] | Initial balance and outstanding principal balance includes unamortized premium.

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