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v2.4.0.6

Employee Benefit Plan (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Employee Benefit Plan [Abstract] |  |  |
Maximum annual contribution per employee, percent | 60.00% |  |
Percentage of participant's contributions matched by employer | 60.00% |  |
Employer matching contribution, percent | 8.00% |  |
Employer contributions | $ 378 | $ 321 | $ 297

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- Definition Defined Contribution Plan, Employer Contribution Amount + References No definition available. + Details
Name: | nnn_DefinedContributionPlanEmployerContributionAmount
Namespace Prefix: | nnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Defined Contribution Plan, Employer Matching Contribution, Percent of Match + References No definition available. + Details
Name: | nnn_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | nnn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | nnn_EmployeeBenefitPlanAbstract
Namespace Prefix: | nnn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration