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Summary of Significant Accounting Policies - Narrative (Detail)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2023
Dec. 31, 2023
reporting_unit
Dec. 31, 2023
USD ($)
Dec. 31, 2023
Dec. 31, 2023
unit
Dec. 31, 2022
Goodwill [Line Items]                
Cash and cash equivalents maximum maturity period     3 months          
Concentration risk, customer     no         no
Number of reporting units       5     5  
Acquired goodwill         $ 69,444      
Impairment         7,246      
Vesting period of deferred cash bonuses     3 years          
Variation percentage of deferred cash bonuses           15.00%    
Additional vesting period after deferral date for bonus payment     3 years          
Heidrick Consulting                
Goodwill [Line Items]                
Impairment         7,246      
Businessfourzero                
Goodwill [Line Items]                
Acquired goodwill   $ 7,100     7,073      
Businessfourzero | Heidrick Consulting                
Goodwill [Line Items]                
Acquired goodwill $ 7,100       $ 7,073