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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2024
Feb. 19, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-10822    
Entity Registrant Name National Health Investors, Inc.    
Entity Incorporation, State or Country Code MD    
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 Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Emerging Growth Company false    
Entity Small Business false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 2,806,597,661
Entity Common Stock, Shares Outstanding   45,687,942  
Documents Incorporated by Reference
Portions of the registrant’s definitive proxy statement for its 2025 annual meeting of stockholders are incorporated by reference into Part III, Items 10, 11, 12, 13, and 14 of this Annual Report on Form 10-K.
    
Amendment Flag false    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000877860