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Condensed Consolidated Statements Of Cash Flows (Parenthetical) | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Shares of restricted and unrestricted common stock, pursuant to NNN's performance incentive plan | 298,896 | 396,577
Shares of common stock to directors pursuant to NNN's performance incentive plan | 4,292 | 4,122
Shares of common stock pursuant to NNN's Deferred Director Fee Plan | 3,227 | 5,317

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
Period Type: | duration

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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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