Organization and Summary of Significant Accounting Policies (Summary of NNN's Investment Portfolio) (Details) ft² in Thousands	3 Months Ended
	Mar. 31, 2016 ft² state property
Property Portfolio:
Total properties | property	2,293
Gross leasable area (square feet) | ft²	25,401
States | state	47
Weighted average remaining lease term (years)	11 years 3 months 19 days