v3.25.3
Document and Entity Information - shares
9 Months Ended
Sep. 30, 2025
Nov. 10, 2025
Cover [Abstract]    
Entity Registrant Name HORIZON KINETICS HOLDING CORPORATION  
Entity Central Index Key 0000088000  
Document Type 10-Q  
Document Period End Date Sep. 30, 2025  
Amendment Flag false  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q3  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   18,635,321
Entity Interactive Data Current Yes  
Entity Shell Company false  
Entity File Number 001-13458  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 84-0920811  
Entity Address, Address Line One 470 Park Ave S  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10016  
City Area Code 646  
Local Phone Number 291-2300  
Document Quarterly Report true  
Document Transition Report false  
Entity Current Reporting Status Yes