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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Common stock (in dollars per share) | $ 1.65 us-gaap_CommonStockDividendsPerShareDeclared | $ 1.60 us-gaap_CommonStockDividendsPerShareDeclared | $ 1.56 us-gaap_CommonStockDividendsPerShareDeclared
Stock issued during period, shares | 5,493,595 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 29,013 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 40,460 us-gaap_StockIssuedDuringPeriodSharesNewIssues
ATM equity program, shares | 3,758,362 us-gaap_StockIssuedDuringPeriodSharesOther | 6,956,992 us-gaap_StockIssuedDuringPeriodSharesOther | 4,282,298 us-gaap_StockIssuedDuringPeriodSharesOther
Conversion of 2028 Notes, shares |  | 2,407,911 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities |
Discounted stock purchase program, shares | 100,161 nnn_IssuanceOfSharesDiscountedStockPurchaseProgram | 322,084 nnn_IssuanceOfSharesDiscountedStockPurchaseProgram | 1,689,160 nnn_IssuanceOfSharesDiscountedStockPurchaseProgram
Restricted common stock, shares | 360,080 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross | 290,181 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross | 373,913 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
Series C Preferred Stock |  |  |
Series C preferred stock (in dollars per share) |  |  | $ 0.53776 nnn_DividendPerDepositaryShareOfSeriesCPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Redemption of shares of Series C Preferred Stock |  |  | 3,680,000 us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember
Series D Depositary Share |  |  |
Series D preferred stock (in dollars per share) | $ 1.65625 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = nnn_SeriesDDepositaryShareMember | $ 1.65625 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = nnn_SeriesDDepositaryShareMember | $ 1.34340 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = nnn_SeriesDDepositaryShareMember
Stock issued during period, shares |  |  | 11,500,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = nnn_SeriesDDepositaryShareMember
Series E Depositary Share |  |  |
Series D preferred stock (in dollars per share) | $ 1.42500 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = nnn_SeriesEDepositaryShareMember | $ 0.77188 us-gaap_PreferredStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = nnn_SeriesEDepositaryShareMember |
Stock issued during period, shares |  | 11,500,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = nnn_SeriesEDepositaryShareMember |

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