Condensed Consolidated Statements of Cash Flows (Parenthetical) - shares	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014
Statement of Cash Flows [Abstract]
Issued shares of restricted and unrestricted common stock, pursuant to NNN’s performance incentive plan	274,693	378,965
Issued shares of common stock, pursuant to NNN’s Deferred Director Fee Plan	7,243	8,229

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.

No definition available.

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