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Preferred Stock (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
1 Months Ended 12 Months Ended 1 Months Ended
Nov. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Oct. 31, 2006
Class of Stock [Line Items]            
Ratio of depositary share to underlying preferred stock   0.01nnn_RatioOfDepositaryShareToUnderlyingPreferredStock        
Redemption price per share   $ 2,500.00us-gaap_PreferredStockRedemptionPricePerShare        
Stock issuance costs $ 8,488nnn_StockIssuanceCosts $ 10,683nnn_StockIssuanceCosts $ 3,774nnn_StockIssuanceCosts $ 2,265nnn_StockIssuanceCosts    
Underwriters over allotment of shares 712,500nnn_UnderwritersOverAllotmentOfShares 1,500,000nnn_UnderwritersOverAllotmentOfShares        
Stated liquidation value per share   $ 25.00us-gaap_PreferredStockLiquidationPreference        
Series C Preferred Stock            
Class of Stock [Line Items]            
Ratio of depositary share to underlying preferred stock           0.01nnn_RatioOfDepositaryShareToUnderlyingPreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
Stock redeemed during period, shares       3,680,000us-gaap_StockRedeemedOrCalledDuringPeriodShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
   
Stock issuance costs         3,098nnn_StockIssuanceCosts
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
 
Series C Depositary Share            
Class of Stock [Line Items]            
Dividend Rate   7.375%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= nnn_SeriesCDepositaryShareMember
       
Depositary Shares Outstanding           3,680,000us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= nnn_SeriesCDepositaryShareMember
Stock redeemed during period, shares         3,680,000us-gaap_StockRedeemedOrCalledDuringPeriodShares
/ us-gaap_StatementClassOfStockAxis
= nnn_SeriesCDepositaryShareMember
 
Redemption price per share         $ 25.00us-gaap_PreferredStockRedemptionPricePerShare
/ us-gaap_StatementClassOfStockAxis
= nnn_SeriesCDepositaryShareMember
 
Aggregate redemption price per share         $ 25.0768229nnn_PreferredStockAggregateRedemptionPricePerShare
/ us-gaap_StatementClassOfStockAxis
= nnn_SeriesCDepositaryShareMember
 
Series D Preferred Stock            
Class of Stock [Line Items]            
Dividend Rate   6.625%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
6.625%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
     
Depositary Shares Outstanding   115,000us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
115,000us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
     
Gross Proceeds   0us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
0us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
287,500us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
   
Stated liquidation value per share   $ 2,500.00us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
$ 2,500.00us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
     
Series D Depositary Share            
Class of Stock [Line Items]            
Dividend Rate   6.625%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= nnn_SeriesDDepositaryShareMember
       
Depositary Shares Outstanding   11,500,000us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= nnn_SeriesDDepositaryShareMember
       
Stock issuance costs   9,855nnn_StockIssuanceCosts
/ us-gaap_StatementClassOfStockAxis
= nnn_SeriesDDepositaryShareMember
       
Gross Proceeds   287,500us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= nnn_SeriesDDepositaryShareMember
       
Dividend Per Depositary Share   $ 1.656250nnn_PreferredStockFixedAnnualDividendPerShareDepositoryShares
/ us-gaap_StatementClassOfStockAxis
= nnn_SeriesDDepositaryShareMember
       
Series E Preferred Stock            
Class of Stock [Line Items]            
Dividend Rate   5.70%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
5.70%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
     
Depositary Shares Outstanding   115,000us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
115,000us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
     
Gross Proceeds   0us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
287,500us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
0us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
   
Stated liquidation value per share   $ 2,500.00us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
$ 2,500.00us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
     
Series E Depositary Share            
Class of Stock [Line Items]            
Dividend Rate   5.70%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= nnn_SeriesEDepositaryShareMember
       
Depositary Shares Outstanding   11,500,000us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= nnn_SeriesEDepositaryShareMember
       
Stock issuance costs   9,856nnn_StockIssuanceCosts
/ us-gaap_StatementClassOfStockAxis
= nnn_SeriesEDepositaryShareMember
       
Gross Proceeds   $ 287,500us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= nnn_SeriesEDepositaryShareMember
       
Dividend Per Depositary Share   $ 1.425000nnn_PreferredStockFixedAnnualDividendPerShareDepositoryShares
/ us-gaap_StatementClassOfStockAxis
= nnn_SeriesEDepositaryShareMember