Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025	Jun. 30, 2025
Statement of Cash Flows [Abstract]
Restricted cash and cash held in escrow	$ 0	$ 776	$ 775

Restricted Cash and Investments, Restricted Cash and Cash Held in Escrow, Current

No definition available.

Name:	nnn_RestrictedCashandInvestmentsRestrictedCashandCashHeldinEscrowCurrent
Namespace Prefix:	nnn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant