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Cover - USD ($)
 12 Months Ended
Dec. 31, 2024
Feb. 27, 2025
Jun. 28, 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 0-25837    
Entity Registrant Name HEIDRICK & STRUGGLES INTERNATIONAL, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 36-2681268    
Entity Address, Address Line One 233 South Wacker Drive    
Entity Address, Address Line Two Suite 4900    
Entity Address, City or Town Chicago    
Entity Address, State or Province IL    
Entity Address, Postal Zip Code 60606-6303    
City Area Code (312)    
Local Phone Number 496-1200    
Title of 12(b) Security Common Stock, $.01 par value    
Trading Symbol HSII    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 527,101,000
Entity Common Stock, Shares Outstanding   20,409,835  
Documents Incorporated by Reference
Portions of the registrant’s definitive Proxy Statement for its Annual Meeting of Stockholders to be held on May 22, 2025, are incorporated by reference into Part III of this Form 10-K.
    
Amendment Flag false    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001066605