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v2.4.1.9

Organization and Summary of Significant Accounting Policies (Correction of Immaterial Errors) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011
Book charges associated with deferred tax assets | $ 2,756 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves | $ 4,728 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves |  |  |  |
Gross deferred tax assets | 11,421 us-gaap_DeferredTaxAssetsGross | 14,188 us-gaap_DeferredTaxAssetsGross |  |  |  |
Income tax benefit | (58)us-gaap_DeferredIncomeTaxExpenseBenefit | (800)us-gaap_DeferredIncomeTaxExpenseBenefit | 7,034 us-gaap_DeferredIncomeTaxExpenseBenefit |  |  |
Correction of Immaterial Errors |  |  |  |  |  |
Book charges associated with deferred tax assets |  |  |  |  | 10,350 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = nnn_CorrectionOfImmaterialErrorsMember |
Decrease of the valuation allowance related to deferred tax assets |  |  | 10,350 nnn_IncreaseDecreaseInDeferredTaxAssets / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = nnn_CorrectionOfImmaterialErrorsMember |  |  |
Review of Realizability of Deferred Tax Assets |  |  |  |  |  |
Gross deferred tax assets |  |  |  | 3,104 us-gaap_DeferredTaxAssetsGross / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = nnn_ReviewOfRealizabilityOfDeferredTaxAssetsMember | 3,104 us-gaap_DeferredTaxAssetsGross / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = nnn_ReviewOfRealizabilityOfDeferredTaxAssetsMember | 3,104 us-gaap_DeferredTaxAssetsGross / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = nnn_ReviewOfRealizabilityOfDeferredTaxAssetsMember
Understatement of deferred income tax benefit |  |  |  | 3,121 nnn_DeferredIncomeTaxBenefitUnderstatedAmount / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = nnn_ReviewOfRealizabilityOfDeferredTaxAssetsMember | 3,372 nnn_DeferredIncomeTaxBenefitUnderstatedAmount / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = nnn_ReviewOfRealizabilityOfDeferredTaxAssetsMember |
Understatement of net deferred tax assets |  |  |  | 6,493 nnn_DeferredTaxAssetsNetUnderstatedAmount / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = nnn_ReviewOfRealizabilityOfDeferredTaxAssetsMember |  | 6,493 nnn_DeferredTaxAssetsNetUnderstatedAmount / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = nnn_ReviewOfRealizabilityOfDeferredTaxAssetsMember
Income tax benefit |  |  | 6,493 us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = nnn_ReviewOfRealizabilityOfDeferredTaxAssetsMember |  |  |
Review of Realizability of Remaining Deferred Tax Assets |  |  |  |  |  |
Income tax benefit |  |  | $ 1,178 us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis = nnn_ReviewOfRealizabilityOfRemainingDeferredTaxAssetsMember |  |  |

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- Definition Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6510177 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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