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Goodwill and Other Intangible Assets - Narrative (Detail) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2024 USD ($) | Apr. 30, 2023 USD ($) | Feb. 28, 2023 USD ($) | Dec. 31, 2024 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2024 | Dec. 31, 2024 USD ($) | Dec. 31, 2024 reporting_unit | Dec. 31, 2024 unit | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Oct. 31, 2023 | Apr. 01, 2023 USD ($) | Feb. 01, 2023 USD ($)
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reporting units |  |  |  |  |  |  |  |  | 5 | 5 |  |  |  |  |
Goodwill, impairment loss |  |  |  |  |  |  |  | $ 59,478 |  |  | $ 7,246 | $ 0 |  |  |
Weighted Average Life (in years) |  |  |  |  |  |  | 8 years 10 months 24 days |  |  |  |  |  |  |  |
Intangible amortization |  |  |  |  |  |  |  | 8,075 |  |  | 9,395 | $ 3,209 |  |  |
Americas Reporting Unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of fair value in excess of carrying value | 292.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
On-Demand Talent Reporting Unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of fair value in excess of carrying value |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% |  |
Goodwill, impairment loss | $ 43,300 |  |  | $ 43,300 | $ 14,800 |  |  |  |  |  |  |  |  |  |
Europe Reporting Unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, impairment loss |  |  |  |  | $ 1,500 |  |  |  |  |  |  |  |  |  |
Software |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Life (in years) |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |
Trade name |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Life (in years) |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |
Client relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Life (in years) |  |  |  |  |  |  | 10 years 6 months |  |  |  |  |  |  |  |
Atreus |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  |  |  |  |  |  | 62,371 |  |  |  |
Weighted Average Life (in years) |  |  | 6 years 8 months 12 days |  |  |  |  |  |  |  |  |  |  |  |
Atreus | Customer Relationships, Short-Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles acquired |  |  | $ 6,000 |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Life (in years) |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Atreus | Customer Relationships, Long-Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles acquired |  |  | $ 5,300 |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Life (in years) |  |  | 14 years |  |  |  |  |  |  |  |  |  |  |  |
Atreus | Software |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles acquired |  |  | $ 5,400 |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Life (in years) |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Atreus | Trade name |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles acquired |  |  | $ 2,500 |  |  |  |  |  |  |  |  |  |  |  | $ 2,500
Weighted Average Life (in years) |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Atreus | Client relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,300
Businessfourzero |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  | $ 7,100 |  |  |  |  | 7,073 |  |  |  |
Weighted Average Life (in years) |  | 8 years 3 months 18 days |  |  |  |  |  |  |  |  |  |  |  |  |
Businessfourzero | Trade name |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles acquired |  | $ 500 |  |  |  |  |  |  |  |  |  |  |  | $ 500 |
Weighted Average Life (in years) |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |
Businessfourzero | Client relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles acquired |  | $ 3,500 |  |  |  |  |  |  |  |  |  |  |  | $ 3,500 |
Weighted Average Life (in years) |  | 9 years |  |  |  |  |  |  |  |  |  |  |  |  |
On-Demand Talent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, impairment loss |  |  |  |  |  |  |  | 58,015 |  |  | 0 |  |  |  |
On-Demand Talent | Atreus |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired goodwill |  |  | $ 62,400 |  |  |  |  |  |  |  | 62,371 |  |  |  |
On-Demand Talent | Businessfourzero |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Heidrick Consulting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, impairment loss |  |  |  |  |  |  |  | $ 0 |  |  | 7,246 |  |  |  |
Heidrick Consulting | Atreus |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired goodwill |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Heidrick Consulting | Businessfourzero |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired goodwill |  | $ 7,100 |  |  |  |  |  |  |  |  | $ 7,073 |  |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481283/985-20-50-2 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + 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 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482686/350-30-45-2 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 + 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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