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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Statement of Cash Flows [Abstract] |  |  |
Restricted cash or cash held in escrow | $ 0 | $ 0 | $ 601,000

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- Definition Restricted Cash and Investments, Restricted Cash and Cash Held in Escrow, Current + References No definition available. + Details
Name: | nnn_RestrictedCashandInvestmentsRestrictedCashandCashHeldinEscrowCurrent
Namespace Prefix: | nnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_StatementOfCashFlowsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration