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Basis of Presentation	12 Months Ended
Basis of Presentation	Dec. 31, 2024
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation Heidrick & Struggles International, Inc. and subsidiaries (the "Company) is a human capital leadership advisory firm providing executive search, consulting and on-demand talent services to businesses and business leaders worldwide to help them to improve the effectiveness of their leadership teams. We help our clients build leadership teams by facilitating the recruitment, management and development of senior executives. The Company operates globally, including Executive Search operating segments in the Americas, Europe and Asia Pacific. The consolidated financial statements include Heidrick & Struggles International, Inc. and its wholly owned subsidiaries and have been prepared using accounting principles generally accepted in the United States of America (“GAAP”). The preparation of these financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses. Significant items subject to estimates and assumptions include revenue recognition, allowances for deferred tax assets and liabilities, the assessment of goodwill for impairment, and contingent consideration liabilities. Estimates are subject to a degree of uncertainty and actual results could differ from these estimates.