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Segment Information - Schedule of Assets by Segment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Goodwill And Identifiable Intangible Assets [Line Items]    
Total allocated current assets $ 772,977 $ 693,214
Unallocated non-current assets 270,867 225,283
Total goodwill and other intangible assets, net 150,344 223,094
Total assets 1,194,188 1,141,591
Operating Segments    
Goodwill And Identifiable Intangible Assets [Line Items]    
Total allocated current assets 768,549 682,543
Global Operations Support    
Goodwill And Identifiable Intangible Assets [Line Items]    
Total allocated current assets 4,428 10,671
Executive Search    
Goodwill And Identifiable Intangible Assets [Line Items]    
Total goodwill and other intangible assets, net 90,782 93,351
Executive Search | Operating Segments    
Goodwill And Identifiable Intangible Assets [Line Items]    
Total allocated current assets 656,107 591,985
On-Demand Talent    
Goodwill And Identifiable Intangible Assets [Line Items]    
Total goodwill and other intangible assets, net 57,713 126,707
On-Demand Talent | Operating Segments    
Goodwill And Identifiable Intangible Assets [Line Items]    
Total allocated current assets 45,814 37,224
Heidrick Consulting    
Goodwill And Identifiable Intangible Assets [Line Items]    
Total goodwill and other intangible assets, net 1,849 3,036
Heidrick Consulting | Operating Segments    
Goodwill And Identifiable Intangible Assets [Line Items]    
Total allocated current assets 66,628 53,334
Americas | Executive Search    
Goodwill And Identifiable Intangible Assets [Line Items]    
Total goodwill and other intangible assets, net 90,745 91,762
Americas | Executive Search | Operating Segments    
Goodwill And Identifiable Intangible Assets [Line Items]    
Total allocated current assets 413,380 360,111
Europe | Executive Search    
Goodwill And Identifiable Intangible Assets [Line Items]    
Total goodwill and other intangible assets, net 37 1,589
Europe | Executive Search | Operating Segments    
Goodwill And Identifiable Intangible Assets [Line Items]    
Total allocated current assets 147,156 139,803
Asia Pacific | Executive Search    
Goodwill And Identifiable Intangible Assets [Line Items]    
Total goodwill and other intangible assets, net 0 0
Asia Pacific | Executive Search | Operating Segments    
Goodwill And Identifiable Intangible Assets [Line Items]    
Total allocated current assets $ 95,571 $ 92,071