Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Statement of Cash Flows [Abstract]
Restricted cash or cash held in escrow	$ 4,986	$ 3,966	$ 21,126

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