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Condensed Consolidated Statements of Cash Flows (Parenthetical) - shares | 9 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014
Statement of Cash Flows [Abstract] |  |
Issued shares of restricted and unrestricted common stock, pursuant to NNN’s performance incentive plan | 279,712 | 382,645
Issued shares of common stock, pursuant to NNN’s Deferred Director Fee Plan | 11,658 | 12,166

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
Name: | nnn_IssuedSharesOfCommonStockPursuantToDeferredDirectorFeePlanShares
Namespace Prefix: | nnn_
Data Type: | xbrli:sharesItemType
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
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