XML 75 R58.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Commercial Mortgage Residual Interests (Securitizations) (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 securitizations | Dec. 31, 2016 securitizations | Dec. 31, 2015 securitization
Commercial Mortgage Residual Interests [Abstract] |  |  |
Number of securitizations | 5 | 5 | 7
Remaining number of securitizations |  | 2 |

X
- Definition Commercial Mortgage Residual Interests [Abstract] + References No definition available. + Details
Name: | nnn_CommercialMortgageResidualInterestsAbstract
Namespace Prefix: | nnn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Securitizations + References No definition available. + Details
Name: | nnn_NumberofSecuritizations
Namespace Prefix: | nnn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Remaining Number of Securitizations + References No definition available. + Details
Name: | nnn_RemainingNumberofSecuritizations
Namespace Prefix: | nnn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration