v3.26.1
Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2026
May 04, 2026
Document Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Entity Registrant Name Definitive Healthcare Corp.  
Entity Central Index Key 0001861795  
Entity Tax Identification Number 86-3988281  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Filer Category Accelerated Filer  
Entity File Number 001-40815  
Entity Shell Company false  
Entity Emerging Growth Company false  
Entity Small Business true  
Entity Interactive Data Current Yes  
Entity Incorporation, State or Country Code DE  
Entity Address, Address Line One 492 Old Connecticut Path, Suite 401  
Entity Address, City or Town Framingham  
Entity Address, State or Province MA  
Entity Address, Postal Zip Code 01701  
City Area Code 508  
Local Phone Number 720-4224  
Trading Symbol DH  
Title of 12(b) Security Class A Common Stock, $0.001 par value  
Security Exchange Name NASDAQ  
Document Quarterly Report true  
Entity Common Stock Shares Outstanding   105,524,238
Document Transition Report false