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Derivatives (Details) (USD $) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 instrument | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2007 instrument | Jun. 30, 2011 instrument | May 31, 2014 instrument | Apr. 30, 2013 instrument
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value of interest rate hedges recognized in other comprehensive income | $ 13,579,000 us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet |  |  |  |  |  |  |  |  |  |
Interest expense | 85,510,000 us-gaap_InterestExpense | 85,822,000 us-gaap_InterestExpense | 83,787,000 us-gaap_InterestExpense |  |  |  |  |  |  |  |
Interest rate hedges gain (loss) to be reclassified into interest expense over next 12 months | 1,685,000 us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet |  |  |  |  |  |  |  |  |  |
Number of Interest Rate Derivatives Held | 0 us-gaap_NumberOfInterestRateDerivativesHeld |  |  |  |  |  |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense | 1,129,000 us-gaap_InterestExpense / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember | 438,000 us-gaap_InterestExpense / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember | 231,000 us-gaap_InterestExpense / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember |  |  |  |  |  |  |  |
Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of Interest Rate Derivatives Terminated |  |  |  | 2 nnn_NumberOfInterestRateDerivativesTerminated / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |  |  |  |  |  |
Notional amount of interest rate hedges terminated |  |  |  | 100,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |  |  |  |  |  |
Treasury locks designated as cash flow hedges, fair value |  |  |  | 3,260,000 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | [1] |  |  |  |  |  |
Treasury locks designated as cash flow hedges, other comprehensive income |  |  |  | 3,228,000 us-gaap_CashFlowHedgesDerivativeInstrumentsAtFairValueNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | [2] |  |  |  |  |  |
Treasury Locks |  |  |  |  |  |  |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of Interest Rate Derivatives Terminated |  |  |  |  |  | 2 nnn_NumberOfInterestRateDerivativesTerminated / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_TreasuryLockMember |  |  |  |  |
Notional amount of interest rate hedges terminated |  |  |  |  |  | 150,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_TreasuryLockMember |  |  |  |  |
Treasury locks designated as cash flow hedges, fair value |  |  |  |  |  | 5,300,000 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_TreasuryLockMember | [1] |  |  |  |
Treasury locks designated as cash flow hedges, other comprehensive income |  |  |  |  |  | 5,218,000 us-gaap_CashFlowHedgesDerivativeInstrumentsAtFairValueNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_TreasuryLockMember | [2] |  |  |  |
Forward Swap |  |  |  |  |  |  |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of Interest Rate Derivatives Terminated |  |  |  |  |  |  |  | 3 nnn_NumberOfInterestRateDerivativesTerminated / us-gaap_DerivativeInstrumentRiskAxis = nnn_ForwardSwapMember |  | 4 nnn_NumberOfInterestRateDerivativesTerminated / us-gaap_DerivativeInstrumentRiskAxis = nnn_ForwardSwapMember |
Notional amount of interest rate hedges terminated |  |  |  |  |  |  |  | 225,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = nnn_ForwardSwapMember |  | 240,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = nnn_ForwardSwapMember |
Treasury locks designated as cash flow hedges, fair value |  |  |  |  |  |  |  | 6,312,000 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_DerivativeInstrumentRiskAxis = nnn_ForwardSwapMember | [1] | 3,156,000 us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue / us-gaap_DerivativeInstrumentRiskAxis = nnn_ForwardSwapMember | [1]
Treasury locks designated as cash flow hedges, other comprehensive income |  |  |  |  |  |  |  | $ 6,312,000 us-gaap_CashFlowHedgesDerivativeInstrumentsAtFairValueNet / us-gaap_DerivativeInstrumentRiskAxis = nnn_ForwardSwapMember | [2] | $ 3,141,000 us-gaap_CashFlowHedgesDerivativeInstrumentsAtFairValueNet / us-gaap_DerivativeInstrumentRiskAxis = nnn_ForwardSwapMember | [2]
[1] | Liability
[2] | The amount reported in accumulated other comprehensive income will be reclassified to interest expense as interest payments are made on the related notes payable.

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Number of interest rate derivative instruments terminated by the entity during the period. + References No definition available. + Details
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- Definition Fair value of all liability derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 + Details
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- Definition Net fair value of all derivative instruments designated as cash flow hedging instruments, which is ordinarily reflected within other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 + Details
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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition Number of interest rate derivative instruments held by the entity at the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 + Details
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