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Goodwill and Other Intangible Assets, Net - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2018 | Oct. 01, 2020 | Jul. 13, 2017 | Jun. 15, 2015
Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill | $ 27,210,000 |  | $ 27,210,000 |  | $ 27,210,000 |  |  |  |  |
Amortization expense | 650,000 | $ 657,000 | 1,949,000 | $ 2,043,000 |  |  |  |  |  |
Data and Analytics Services [Member] |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill | 18,783,000 |  | 18,783,000 |  | 18,783,000 | $ 18,783,000 |  |  |  |
Goodwill impairment |  |  | 0 |  | 0 | 5,300,000 |  |  |  |
IT Staffing Services [Member] |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill | $ 8,427,000 |  | 8,427,000 |  | 8,427,000 | $ 8,427,000 |  |  |  | $ 8,400,000
Goodwill impairment |  |  | $ 0 |  | $ 0 |  |  |  |  |
Info Trellis Inc [Member] |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | $ 27,400,000 |
Goodwill impairment |  |  |  |  |  |  | $ 9,700,000 |  |  |
Amber Leaf Partners Inc [Member] |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 6,400,000 |  |

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