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Notes Payable - Convertible (Tables) | 9 Months Ended
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Sep. 30, 2014
Convertible Notes Payable [Abstract] |
Schedule of Debt Instrument Interest Expense | NNN recorded the following interest expense related to the 2028 Notes during 2013. No interest expense was recorded during the quarter and nine months ended September 30, 2014 (dollars in thousands):
| Quarter Ended September 30, 2013 |  | Nine Months Ended September 30, 2013
Contractual interest expense | $ | 26 |  |  | $ | 5,400 |
Noncash interest charges | — |  |  | 2,072 |
Amortization of debt costs | — |  |  | 566 |
Total interest expense | $ | 26 |  |  | $ | 8,038 |

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- Definition Schedule of Debt Instrument Interest Expense [Table Text Block] + 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration