Earnings From Discontinued Operations (Summary Of Earnings From Discontinued Operations) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rental income from operating leases									$ 371,948,000	$ 311,753,000	$ 239,758,000
Percentage rent									1,557,000	1,165,000	1,093,000
Real estate expense reimbursement from tenants									13,110,000	11,587,000	10,080,000
Interest and other income from real estate transactions									1,467,000	2,239,000	2,287,000
Total revenues	103,648,000	89,059,000	100,482,000	96,015,000	92,183,000	84,250,000	81,096,000	77,132,000	392,327,000	331,536,000	258,690,000
General and administrative									32,576,000	32,187,000	28,796,000
Real estate									18,100,000	17,041,000	16,997,000
Depreciation and amortization									99,246,000	73,707,000	56,466,000
Impairment losses and other charges									1,972,000	3,088,000	(1,349,000)
Total operating expenses									153,079,000	128,835,000	101,934,000
Interest expense									85,283,000	83,192,000	75,532,000
Total other expenses (revenues)									83,790,000	80,960,000	73,939,000
Earnings (loss) before gain on disposition of real estate and income tax expense									155,458,000	122,207,000	84,868,000
Gain on disposition of real estate									173,000	0	297,000
Income tax expense									(618,000)	6,947,000	(899,000)
Earnings from discontinued operations attributable to NNN including noncontrolling interests									5,072,000	8,709,000	7,676,000
Noncontrolling interests									60,000	78,000	(91,000)
Discontinued operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Rental income from operating leases									2,631,000	7,342,000	10,520,000
Earned income from direct financing leases									190,000	324,000	420,000
Percentage rent									1,000	27,000	27,000
Real estate expense reimbursement from tenants									327,000	383,000	466,000
Interest and other income from real estate transactions									37,000	17,000	62,000
Total revenues									3,186,000	8,093,000	11,495,000
General and administrative									219,000	20,000	41,000
Real estate									600,000	1,026,000	1,041,000
Depreciation and amortization									371,000	1,480,000	1,957,000
Impairment losses and other charges									2,149,000	7,026,000	431,000
Total operating expenses									3,339,000	9,552,000	3,470,000
Interest expense									580,000	732,000	695,000
Total other expenses (revenues)									580,000	732,000	695,000
Earnings (loss) before gain on disposition of real estate and income tax expense									(733,000)	(2,191,000)	7,330,000
Gain on disposition of real estate									6,272,000	10,956,000	424,000
Income tax expense									(467,000)	(56,000)	(78,000)
Noncontrolling interests									(226,000)	(29,000)	(100,000)
Earnings from discontinued operations attributable to NNN									$ 4,846,000	$ 8,680,000	$ 7,576,000