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Restructuring - Schedule of Restructuring Charges by Segment (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 0 $ 0 $ 3,792,000
Restructuring and related cost 56,164,000    
Employee related      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     (183,000)
Restructuring and related cost 32,597,000    
Office related      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     3,962,000
Restructuring and related cost 22,872,000    
Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     13,000
Restructuring and related cost 695,000    
Corporate, Non-Segment      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     (224,000)
Restructuring and related cost 3,795,000    
Corporate, Non-Segment | Employee related      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     62,000
Restructuring and related cost 1,416,000    
Corporate, Non-Segment | Office related      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     (296,000)
Restructuring and related cost 1,819,000    
Corporate, Non-Segment | Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     10,000
Restructuring and related cost 560,000    
Heidrick Consulting | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     355,000
Restructuring and related cost 5,012,000    
Heidrick Consulting | Operating Segments | Employee related      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     (44,000)
Restructuring and related cost 2,589,000    
Heidrick Consulting | Operating Segments | Office related      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     399,000
Restructuring and related cost 2,352,000    
Heidrick Consulting | Operating Segments | Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     0
Restructuring and related cost 71,000    
Americas | Executive Search | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     3,882,000
Restructuring and related cost 34,361,000    
Americas | Executive Search | Operating Segments | Employee related      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     20,000
Restructuring and related cost 16,226,000    
Americas | Executive Search | Operating Segments | Office related      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     3,859,000
Restructuring and related cost 18,101,000    
Americas | Executive Search | Operating Segments | Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     3,000
Restructuring and related cost 34,000    
Europe | Executive Search | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     (97,000)
Restructuring and related cost 8,506,000    
Europe | Executive Search | Operating Segments | Employee related      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     (97,000)
Restructuring and related cost 8,256,000    
Europe | Executive Search | Operating Segments | Office related      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     0
Restructuring and related cost 226,000    
Europe | Executive Search | Operating Segments | Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     0
Restructuring and related cost 24,000    
Asia Pacific | Executive Search | Operating Segments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     (124,000)
Restructuring and related cost 4,490,000    
Asia Pacific | Executive Search | Operating Segments | Employee related      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     (124,000)
Restructuring and related cost 4,110,000    
Asia Pacific | Executive Search | Operating Segments | Office related      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     0
Restructuring and related cost 374,000    
Asia Pacific | Executive Search | Operating Segments | Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     $ 0
Restructuring and related cost $ 6,000