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Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues before reimbursable expenses | $ 378,089 | $ 367,466 | $ 1,122,491 | $ 1,048,750
Revenues before reimbursable expenses | 370,049 | 358,178 | 1,097,664 | 1,022,832
Consulting And Managed Services Capability [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues before reimbursable expenses | 219,281 | 221,111 | 649,757 | 605,486
Digital Capability [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues before reimbursable expenses | 158,808 | 146,355 | 472,734 | 443,264
Consulting And Managed Services Capability [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues before reimbursable expenses | 214,517 | 214,688 | 634,415 | 589,137
Digital Capability [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues before reimbursable expenses | 155,532 | 143,490 | 463,249 | 433,695
Healthcare |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues before reimbursable expenses | 187,692 | 184,974 | 568,341 | 517,124
Revenues before reimbursable expenses | 183,136 | 179,177 | 553,976 | 501,994
Healthcare | Consulting And Managed Services Capability [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues before reimbursable expenses | 132,537 | 135,309 | 398,352 | 368,896
Healthcare | Digital Capability [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues before reimbursable expenses | 55,155 | 49,665 | 169,989 | 148,228
Healthcare | Consulting And Managed Services Capability [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues before reimbursable expenses | 128,966 | 130,548 | 387,164 | 357,228
Healthcare | Digital Capability [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues before reimbursable expenses | 54,170 | 48,629 | 166,812 | 144,766
Education |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues before reimbursable expenses | 123,253 | 113,432 | 361,985 | 332,865
Revenues before reimbursable expenses | 121,048 | 111,043 | 355,384 | 325,884
Education | Consulting And Managed Services Capability [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues before reimbursable expenses | 62,146 | 57,028 | 183,219 | 165,632
Education | Digital Capability [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues before reimbursable expenses | 61,107 | 56,404 | 178,766 | 167,233
Education | Consulting And Managed Services Capability [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues before reimbursable expenses | 61,222 | 55,837 | 180,162 | 162,490
Education | Digital Capability [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues before reimbursable expenses | 59,826 | 55,206 | 175,222 | 163,394
Commercial: |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues before reimbursable expenses | 67,144 | 69,060 | 192,165 | 198,761
Revenues before reimbursable expenses | 65,865 | 67,958 | 188,304 | 194,954
Commercial: | Consulting And Managed Services Capability [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues before reimbursable expenses | 24,598 | 28,774 | 68,186 | 70,958
Commercial: | Digital Capability [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues before reimbursable expenses | 42,546 | 40,286 | 123,979 | 127,803
Commercial: | Consulting And Managed Services Capability [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues before reimbursable expenses | 24,329 | 28,303 | 67,089 | 69,419
Commercial: | Digital Capability [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues before reimbursable expenses | $ 41,536 | $ 39,655 | $ 121,215 | $ 125,535

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