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Summary of Significant Accounting Policies - Narrative (Details) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 USD ($) shares | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) reportingUnit | Jun. 30, 2023 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |
Number of reporting units | reportingUnit |  |  | 5 |
Impairment |  |  | $ 16,224 |
On-Demand Talent Reporting Unit |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Impairment | $ 14,800 |  | 14,800 |
Europe Reporting Unit |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Impairment | $ 1,500 |  | $ 1,500 |
Heidrick Consulting Reporting Unit |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Impairment |  | $ 7,200 |  | $ 7,200
Restricted stock units |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Antidilutive securities excluded from computation of earnings (in shares) | shares | 474 |  |  |
Performance stock units |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Antidilutive securities excluded from computation of earnings (in shares) | shares | 132 |  |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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- Definition Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482548/350-20-55-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-2 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482598/350-20-45-2 + Details
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