XML 14 R1.htm IDEA: XBRL DOCUMENT v3.25.1
Cover - shares
 3 Months Ended
Mar. 31, 2025
May 02, 2025
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2025  
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, $0.01 par value  
Trading Symbol HSII  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   20,620,786
Amendment Flag false  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q1  
Entity Central Index Key 0001066605  
Current Fiscal Year End Date --12-31