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Condensed Consolidated Statements Of Cash Flows (Parenthetical) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Statement of Cash Flows [Abstract] |  |
Issued shares of restricted and unrestricted common stock, pursuant to NNN’s performance incentive plan | 267,133 nnn_IssuedSharesOfRestrictedAndUnrestrictedCommonStockShares | 371,134 nnn_IssuedSharesOfRestrictedAndUnrestrictedCommonStockShares
Issued shares of common stock to directors, pursuant to NNN's performance incentive plan | 3,602 nnn_IssuedSharesOfCommonStockPursuantToPerformanceIncentivePlanShares | 3,985 nnn_IssuedSharesOfCommonStockPursuantToPerformanceIncentivePlanShares
Issued shares of common stock, pursuant to NNN’s Deferred Director Fee Plan | 3,435 nnn_IssuedSharesOfCommonStockPursuantToDeferredDirectorFeePlanShares | 4,162 nnn_IssuedSharesOfCommonStockPursuantToDeferredDirectorFeePlanShares

X
- Definition Represents the number of shares of the Company's common stock issued to members of the Company's board of directors during the period under the deferred director's fee plan. + References No definition available. + Details
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Namespace Prefix: | nnn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
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X
- Definition Represents the number of shares of the Company's common stock issued to members of the Company's board of directors during the period in connection with share-based compensation. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of shares of the Company's common stock issued during the period in connection with share-based compensation. + References No definition available. + Details
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Namespace Prefix: | nnn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: | us-gaap_
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