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Condensed Consolidated Statements Of Cash Flows (Parenthetical) | 9 Months Ended
--- | ---
Sep. 30, 2012 | Sep. 30, 2011
shares of restricted and unrestricted common stock, pursuant to NNN's performance incentive plan (in shares) | 396,577 | 141,351
shares of common stock to directors pursuant to NNN's performance incentive plan (in shares) | 12,373 | 6,975
shares of common stock, pursuant to NNN's Deferred Director Fee Plan (in shares) | 14,836 | 19,962
shares of restricted stock surrendered (in shares) | 4,712 | 5,215

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 to members of the Company's board of directors during the period in connection with share-based compensation. + References No definition available. + Details
Name: | nnn_IssuedSharesOfCommonStockPursuantToPerformanceIncentivePlanShares
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
- Definition Surrender Of Restricted Stock Shares + References No definition available. + Details
Name: | nnn_SurrenderOfRestrictedStockShares
Namespace Prefix: | nnn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration