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Organization and Summary of Significant Accounting Policies (Summary of NNN's Investment Portfolio) (Details)
 12 Months Ended
Dec. 31, 2014
property
state
sqft
Accounting Policies [Abstract]  
Total properties 2,054nnn_InvestmentPropertiesTotal
Gross leasable area (square feet) 22,479,000us-gaap_AreaOfRealEstateProperty
States 47us-gaap_NumberOfStatesInWhichEntityOperates
Weighted average remaining lease term (years) 12 years