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Real Estate - Held for Sale | 12 Months Ended
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Dec. 31, 2012
Real Estate Held for Development and Sale [Abstract] |
Real Estate – Held For Sale | Real Estate – Held For Sale: As of December 31, 2012, NNN owned 23 held for sale Properties: 16 improved properties and seven land parcels. As of December 31, 2011, NNN owned 22 held for sale Properties: 16 improved properties and six land parcels. Real estate held for sale consisted of the following at December 31 (dollars in thousands):
| 2012 |  | 2011
Land and improvements | $ | 15,751 |  |  | $ | 14,172 |
Building and improvements | 37,080 |  |  | 32,044 |
| 52,831 |  |  | 46,216 |
Less accumulated depreciation and amortization | (540 | ) |  | (506 | )
Less impairment | (10,518 | ) |  | (8,774 | )
| $ | 41,773 |  |  | $ | 36,936 |
The following table summarizes the number of held for sale Properties sold and the corresponding gain recognized on the disposition of held for sale Properties included in continuing and discontinued operations for the years ended December 31 (dollars in thousands):
| 2012 |  | 2011 |  | 2010
| # of Properties |  | Gain |  | # of Properties |  | Gain |  | # of Properties |  | Gain
Continuing operations | — |  |  | $ | — |  |  | — |  |  | $ | 297 |  |  | 2 |  |  | $ | 641 |
Discontinued operations | 34 |  |  | 10,956 |  |  | 8 |  |  | 424 |  |  | 16 |  |  | 1,434 |
Noncontrolling interest | — |  |  | — |  |  | — |  |  | (194 | ) |  | — |  |  | (363 | )
| 34 |  |  | $ | 10,956 |  |  | 8 |  |  | $ | 527 |  |  | 18 |  |  | $ | 1,712 |

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- Definition Represents certain disclosures of real estate held for sale as well as other real estate related disclosures. This element may be used as a single block of text to encapsulate the entire real estate disclosure including data and tables. + References No definition available. + Details
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Namespace Prefix: | nnn_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RealEstateHeldForDevelopmentAndSaleAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration