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Income Taxes (Details)	3 Months Ended
Income Taxes (Details)	Jun. 30, 2012
Income Tax Disclosure [Abstract]
Distribution of taxable income requirement	90.00%

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- Definition

Distribution of taxable income requirement.

+ References

No definition available.

+ Details

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Namespace Prefix:	nnn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration