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Schedule III - Real Estate and Accumulated Depreciation and Amortization Real Estate - Held for Sale (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests $ 5,236,251us-gaap_RealEstateGrossAtCarryingValue $ 4,686,844us-gaap_RealEstateGrossAtCarryingValue $ 4,145,368us-gaap_RealEstateGrossAtCarryingValue $ 3,531,845us-gaap_RealEstateGrossAtCarryingValue
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 513,175us-gaap_RealEstateAccumulatedDepreciation 418,136us-gaap_RealEstateAccumulatedDepreciation 333,778us-gaap_RealEstateAccumulatedDepreciation 270,621us-gaap_RealEstateAccumulatedDepreciation
Assets Held-for-sale | Seven-Eleven - Latrobe, PA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 613us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 326us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 613us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 326us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 939us-gaap_RealEstateGrossAtCarryingValue
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Assets Held-for-sale | Chipotle Hadley, MA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 45us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 0us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 453us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 0us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 453us-gaap_RealEstateGrossAtCarryingValue
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Assets Held-for-sale | Power Center Irving, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 951us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,090us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 600us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 602us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,202us-gaap_RealEstateGrossAtCarryingValue
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Assets Held-for-sale | Vacant Land Grand Prairie, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 387us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 0us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 108us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 0us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 108us-gaap_RealEstateGrossAtCarryingValue
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Assets Held-for-sale | Vacant Land Rockwall, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 900us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 0us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 545us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 0us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 545us-gaap_RealEstateGrossAtCarryingValue
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Assets Held-for-sale | Vacant Land Hadley, MA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 2,824us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 0us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 106us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 0us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 106us-gaap_RealEstateGrossAtCarryingValue
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Assets Held-for-sale | Vacant Property Arlington, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,411us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 596us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,411us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,007us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Assets Held-for-sale | Vacant Property Corpus Christi, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,506us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Assets Held-for-sale | Real Estate – Held for Sale        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization $ 1,473us-gaap_RealEstateAccumulatedDepreciation
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[1] Transactions in real estate and accumulated depreciation during 2014, 2013, and 2012 are summarized as follows: 2014 2013 2012Land, buildings, and leasehold interests: Balance at the beginning of year$4,686,844 $4,145,368 $3,531,845Acquisitions, completed construction and tenant improvements601,168 602,836 701,054Disposition of land, buildings, and leasehold interests(50,938) (57,254) (77,219)Provision for loss on impairment of real estate(823) (4,106) (10,312)Balance at the close of year$5,236,251 $4,686,844 $4,145,368Accumulated depreciation and amortization: Balance at the beginning of year$418,136 $333,778 $270,621Disposition of land, buildings, and leasehold interests(9,153) (6,778) (6,980)Depreciation and amortization expense104,192 91,136 70,137Balance at the close of year$513,175 $418,136 $333,778
[2] As of December 31, 2014, the leases are treated as either operating or financing leases for federal income tax purposes. As of December 31, 2014, the aggregate cost of the properties owned by NNN that are under operating leases were $5,119,673 and financing leases were $2,703.