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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 |  |

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