Preferred Stock	12 Months Ended
Dec. 31, 2012
Preferred Stock [Abstract]
Preferred Stock	Preferred Stock: 7.375% Series C Cumulative Redeemable Preferred Stock. In October 2006, NNN issued 3,680,000 depositary shares, each representing 1/100^th of a share of Series C Preferred Stock. In March 2012, NNN redeemed all outstanding depositary shares (3,680,000) representing interests in its Series C Preferred Stock. The Series C Preferred Stock was redeemed at $25.00 per depositary share, plus accumulated and unpaid distributions through the redemption date, for an aggregate redemption price of $25.0768229 per depositary share. The excess carrying amount of preferred stock redeemed over the cash paid to redeem the preferred stock was $3,098,000 of Series C Preferred Stock issuance costs. 6.625% Series D Cumulative Redeemable Preferred Stock. In February 2012, NNN consummated an underwritten public offering of 11,500,000 depositary shares (including 1,500,000 shares in connection with the underwriters over-allotment), each representing a 1/100^th of a share of Series D Preferred Stock, and received gross proceeds of $287,500,000. In connection with this offering, the Company incurred stock issuance costs of approximately $9,855,000, consisting primarily of underwriting commissions and fees, legal and accounting fees and printing expenses. Holders of the Series D depositary shares are entitled to receive, when and as authorized by the Board of Directors, cumulative preferential cash dividends at the rate of 6.625% of the $25.00 liquidation preference per depositary share per annum (equivalent to a fixed annual amount of $1.65625 per depositary share). The Series D Preferred Stock underlying the depositary shares ranks senior to NNN’s common stock with respect to dividend rights and rights upon liquidation, dissolution or winding up of NNN. The Series D Preferred Stock has no maturity date and will remain outstanding unless redeemed. NNN may redeem the Series D Preferred Stock underlying the depositary shares on or after September 23, 2017, for cash, at a redemption price of $2,500.00 per share (or $25.00 per depositary share), plus all accumulated and unpaid dividends. In addition, in limited circumstances relating to NNN's ability to qualify as a REIT or upon a change of control, as defined in the articles supplementary, NNN may redeem the Series D Preferred Stock underlying the depositary shares at a redemption price of $2,500.00 per share (or $25.00 per depositary share), plus all accumulated and unpaid dividends. Upon a change of control, as defined in the articles supplementary, holders of depositary shares may convert some or all of their Series D Preferred Stock into shares of NNN's common stock at conversion rates provided in the related articles supplementary. As of February 22, 2013, the Series D Preferred Stock was not redeemable or convertible.

Preferred Stock:

7.375% Series C Cumulative Redeemable Preferred Stock. In October 2006, NNN issued 3,680,000 depositary shares, each representing 1/100^th of a share of Series C Preferred Stock.

In March 2012, NNN redeemed all outstanding depositary shares (3,680,000) representing interests in its Series C Preferred Stock. The Series C Preferred Stock was redeemed at $25.00 per depositary share, plus accumulated and unpaid distributions through the redemption date, for an aggregate redemption price of $25.0768229 per depositary share. The excess carrying amount of preferred stock redeemed over the cash paid to redeem the preferred stock was $3,098,000 of Series C Preferred Stock issuance costs.

6.625% Series D Cumulative Redeemable Preferred Stock. In February 2012, NNN consummated an underwritten public offering of 11,500,000 depositary shares (including 1,500,000 shares in connection with the underwriters over-allotment), each representing a 1/100^th of a share of Series D Preferred Stock, and received gross proceeds of $287,500,000. In connection with this offering, the Company incurred stock issuance costs of approximately $9,855,000, consisting primarily of underwriting commissions and fees, legal and accounting fees and printing expenses.

Holders of the Series D depositary shares are entitled to receive, when and as authorized by the Board of Directors, cumulative preferential cash dividends at the rate of 6.625% of the $25.00 liquidation preference per depositary share per annum (equivalent to a fixed annual amount of $1.65625 per depositary share). The Series D Preferred Stock underlying the depositary shares ranks senior to NNN’s common stock with respect to dividend rights and rights upon liquidation, dissolution or winding up of NNN. The Series D Preferred Stock has no maturity date and will remain outstanding unless redeemed. NNN may redeem the Series D Preferred Stock underlying the depositary shares on or after September 23, 2017, for cash, at a redemption price of $2,500.00 per share (or $25.00 per depositary share), plus all accumulated and unpaid dividends. In addition, in limited circumstances relating to NNN's ability to qualify as a REIT or upon a change of control, as defined in the articles supplementary, NNN may redeem the Series D Preferred Stock underlying the depositary shares at a redemption price of $2,500.00 per share (or $25.00 per depositary share), plus all accumulated and unpaid dividends. Upon a change of control, as defined in the articles supplementary, holders of depositary shares may convert some or all of their Series D Preferred Stock into shares of NNN's common stock at conversion rates provided in the related articles supplementary. As of February 22, 2013, the Series D Preferred Stock was not redeemable or convertible.