XML 47 R36.htm IDEA: XBRL DOCUMENT
v3.25.2

Stock-Based Compensation and Common Stock (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2025
Share-Based Payment Arrangement [Abstract] |
Schedule of Information Related to Stock-Based Compensation | A summary of information with respect to stock-based compensation is as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30, |  |
| 2025 |  | 2024 |  | 2025 |  | 2024 |  |  |  |
Salaries and benefits (1) | $ | 3,620 |  |  | $ | 2,429 |  |  | $ | 6,235 |  |  | $ | 5,870 |  |  |  |  |
General and administrative expenses | 1,050 |  |  | 1,050 |  |  | 1,050 |  |  | 1,050 |  |  |  |  |
Income tax benefit related to stock-based compensation included in net income (loss) | 1,271 |  |  | 958 |  |  | 1,982 |  |  | 1,907 |  |  |  |  |
(1) Includes $0.7 million and $0.1 million of expense related to cash-settled restricted stock units for the three months ended June 30, 2025, and 2024, respectively, and $0.8 million and $0.9 million of expense related to cash-settled restricted stock units for the six months ended June 30, 2025, and 2024, respectively.
Schedule of Restricted Stock Unit Activity | Restricted stock unit activity for the six months ended June 30, 2025, is as follows:
| Number of Restricted Stock Units |  | Weighted- Average Grant-Date Fair Value
Outstanding on December 31, 2024 | 675,411 |  |  | $ | 31.85 |
Granted | 205,198 |  |  | 45.99 |
Vested and converted to common stock | (233,117) |  |  | 31.72 |
Forfeited | (25,662) |  |  | 31.01 |
Outstanding on June 30, 2025 | 621,830 |  |  | $ | 36.59 |
Schedule of Performance Stock Unit Activity | Performance stock unit activity for the six months ended June 30, 2025, is as follows:
| Number of Performance Stock Units |  | Weighted- Average Grant-Date Fair Value
Outstanding on December 31, 2024 | 353,076 |  |  | $ | 34.17 |
Granted | 132,944 |  |  | 53.37 |
Vested and converted to common stock | (160,636) |  |  | 43.57 |
Forfeited | (13,199) |  |  | 38.55 |
Outstanding on June 30, 2025 | 312,185 |  |  | $ | 37.33 |
Schedule of Phantom Stock Unit Activity | Phantom stock unit activity for the six months ended June 30, 2025, is as follows:
| Number of Phantom Stock Units
Outstanding on December 31, 2024 | 131,177 |
Granted | 22,049 |
Vested | (10,606) |
Forfeited | (2,046) |
Outstanding on June 30, 2025 | 140,574 |

X
- Definition Share-Based Compensation, Phantom Shares Award Outstanding Activity + References No definition available. + Details
Name: | hsii_ShareBasedCompensationPhantomSharesAwardOutstandingActivityTableTextBlock
Namespace Prefix: | hsii_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfNonvestedPerformanceBasedUnitsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration