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Revenue - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($)
Revenue from Contract with Customer [Abstract]
Retainer percentage of estimated first year compensation	33.00%
Retainer and indirect expenses, increment billed, percentage	33.00%
Retainer and indirect expense billing period	3 months
Revenue, performance obligation, description of timing (in months)	six months
Revenue recognized	$ 45.5
Contract with customer, performance obligation satisfied in previous period	$ 29.5

X

- Definition

Revenue From Contract With Customer, Retainer And Indirect Expense Billing Period

+ References

No definition available.

+ Details

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Namespace Prefix:	hsii_
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Balance Type:	na
Period Type:	duration

X

- Definition

Revenue From Contract With Customer, Retainer And Indirect Expenses, Increment Billed, Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	hsii_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Revenue From Contract With Customer, Retainer, Percentage Of Estimated First Year Compensation

+ References

No definition available.

+ Details

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Namespace Prefix:	hsii_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of revenue recognized from performance obligation satisfied or partially satisfied in previous reporting periods. Includes, but is not limited to, change in transaction price.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12A

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Description of timing for satisfying performance obligation in contract with customer. Includes, but is not limited to, as services are rendered, and upon shipment, delivery or completion of service.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

+ Details

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