Organization And Summary Of Significant Accounting Policies (Summary Of NNN's Investment Portfolio) (Details)	3 Months Ended
Mar. 31, 2012
Accounting Policies [Abstract]
Total properties	1,486
Gross leasable area (square feet)	16,999,000
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