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Notes Payable (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
May 31, 2014
instrument
Debt Instrument [Line Items]      
Notes payable, unamortized discount $ 9,968,000us-gaap_DebtInstrumentUnamortizedDiscount $ 10,285,000us-gaap_DebtInstrumentUnamortizedDiscount  
2024 Notes      
Debt Instrument [Line Items]      
Original Principal     350,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= nnn_A2024NotesMember
Stated interest rate     3.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= nnn_A2024NotesMember
Proceeds from Issuance of Long-term Debt 349,293,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= nnn_A2024NotesMember		    
Notes payable, unamortized discount     707,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= nnn_A2024NotesMember
Effective Interest Rate     3.924%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_DebtInstrumentAxis
= nnn_A2024NotesMember
Number of interest rate derivatives held     3us-gaap_NumberOfInterestRateDerivativesHeld
/ us-gaap_DebtInstrumentAxis
= nnn_A2024NotesMember
Aggregate Notional Amount     225,000,000invest_DerivativeNotionalAmount
/ us-gaap_DebtInstrumentAxis
= nnn_A2024NotesMember
Proceeds from notes payable 346,068,000us-gaap_ProceedsFromNotesPayable
/ us-gaap_DebtInstrumentAxis
= nnn_A2024NotesMember		    
Debt Issuance Cost 3,225,000us-gaap_DebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= nnn_A2024NotesMember		    
Forward Contracts | 2024 Notes      
Debt Instrument [Line Items]      
Amount of cash flow hedge reported in AOCI     $ 6,312,000us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
/ us-gaap_DebtInstrumentAxis
= nnn_A2024NotesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember