Organization and Summary of Significant Accounting Policies (Summary Of NNN's Investment Portfolio) (Details)	Dec. 31, 2012 states sqft properties
Accounting Policies [Abstract]
Total properties (including retail operations)	1,622
Gross leasable area (square feet)	19,168,000
States	47

The number of states the entity operates in as of the balance sheet date.

No definition available.

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant