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Condensed Consolidated Statements of Cash Flows (Parenthetical) - shares | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Statement of Cash Flows [Abstract] |  |
Issued shares of restricted and unrestricted common stock, pursuant to NNN’s performance incentive plan | 274,512 | 270,735

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
Name: | nnn_IssuedSharesOfRestrictedAndUnrestrictedCommonStockShares
Namespace Prefix: | nnn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_StatementOfCashFlowsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration