XML 90 R73.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Subsequent Events (Details) - Forward Swap | Feb. 13, 2018 USD ($) instrument | Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Oct. 31, 2015 USD ($) | May 31, 2014 USD ($) | Apr. 30, 2013 USD ($)
--- | --- | --- | --- | --- | --- | ---
Subsequent Event [Line Items] |  |  |  |  |  |
Notional amount |  | $ 250,000,000 | $ 180,000,000 | $ 300,000,000 | $ 225,000,000 | $ 240,000,000
Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Number of interest rate derivatives entered into | instrument | 2 |  |  |  |  |
Notional amount | $ 250,000,000 |  |  |  |  |

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Interest Rate Derivatives Entered Into + References No definition available. + Details
Name: | nnn_NumberofInterestRateDerivativesEnteredInto
Namespace Prefix: | nnn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=nnn_ForwardSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |