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Document and Entity Information Document
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
shares
Document And Entity Information [Abstract]  
Entity Central Index Key 0000877860
Document Type 10-K/A
Document Period End Date Dec. 31, 2023
Entity Registrant Name National Health Investors Inc
Entity Incorporation, State or Country Code MD
Entity File Number 001-10822
Entity Tax Identification Number 62-1470956
Entity Address, Address Line One 222 Robert Rose Drive
Entity Address, City or Town Murfreesboro
Entity Address, State or Province TN
Entity Address, Postal Zip Code 37129
City Area Code (615)
Local Phone Number 890-9100
Title of 12(b) Security Common Stock, $0.01 par value
Trading Symbol NHI
Security Exchange Name NYSE
Entity Emerging Growth Company false
Amendment Flag false
Document Fiscal Year Focus 2023
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Large Accelerated Filer
Entity Small Business false
Entity Shell Company false
Entity Public Float | $ $ 2,165,587
Entity Common Stock, Shares Outstanding | shares 43,409,841
ICFR Auditor Attestation Flag true
Document Transition Report false
Entity Well-known Seasoned Issuer Yes
Document Annual Report true
Current Fiscal Year End Date --12-31
Document Fiscal Period Focus FY
Auditor Name BDO USA, P.C.
Auditor Location Nashville, TN
Auditor Firm ID 243