CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Cash Flows [Abstract]
Restricted cash and cash held in escrow	$ 3,966,000	$ 4,273,000	$ 0

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