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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - shares | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Statement of Cash Flows [Abstract] |  |  |
Issued shares of common stock pursuant to conversion premium (in shares) |  |  |
Issued shares of restricted and unrestricted common stock, pursuant to NNN's performance incentive plan (in shares) | 285,573 | 285,263 | 386,433
Surrender of restricted stock shares | 1,520 |  |
Issued shares of common stock, pursuant to NNN's Deferred Director Fee Plan (in shares) |  |  |

X
- Definition Represents the number of shares of the Company's common stock issued to members of the Company's board of directors during the period under the deferred director's fee plan. + References No definition available. + Details
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Namespace Prefix: | nnn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of shares of the Company's common stock issued during the period in connection with share-based compensation. + References No definition available. + Details
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Namespace Prefix: | nnn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Surrender of Restricted Stock Shares + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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