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Subsequent Events (Details) - USD ($) | 1 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2017 | Sep. 30, 2017
Subsequent Event [Line Items] |  |
Revolving credit facility borrowing capacity |  | $ 650,000,000
Option to increase facility size |  | $ 1,000,000,000
Line of Credit | LIBOR |  |
Subsequent Event [Line Items] |  |
Basis spread on variable rate |  | 0.925%
Amended Credit Facility | Line of Credit |  |
Subsequent Event [Line Items] |  |
Revolving credit facility borrowing capacity |  | $ 650,000,000
Amended Credit Facility | Line of Credit | Subsequent Event |  |
Subsequent Event [Line Items] |  |
Revolving credit facility borrowing capacity | $ 900,000,000 |
Option to increase facility size | $ 1,600,000,000 |
Amended Credit Facility | Line of Credit | LIBOR | Subsequent Event |  |
Subsequent Event [Line Items] |  |
Basis spread on variable rate | 0.875% |
Notes Payable Due October 2017 | Line of Credit |  |
Subsequent Event [Line Items] |  |
Interest rate, stated percentage |  | 6.875%
Notes Payable Due October 2017 | Line of Credit | Subsequent Event |  |
Subsequent Event [Line Items] |  |
Repayments of notes payable | $ 250,000,000 |

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- Definition Line of Credit Facility, Accordion Feature, Increase Limit + References No definition available. + Details
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Namespace Prefix: | nnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- Definition The cash outflow for a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Details
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- Details
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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