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SEGMENT DISCLOSURES - Summary of Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Segment Reporting Information [Line Items] |  |
Revenue | $ 838,014 | $ 494,297
Corporate & other: |  |
General & administrative expenses | 28,070 | 18,711
Interest expense | 25,156 | 4,511
Other (expense) income, net | 1,966 | (9,424)
Income before income tax expense | 172,910 | 104,014
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Revenue | 838,014 | 494,297
Personnel costs | 488,122 | 293,760
Facility costs | 26,920 | 15,580
Other costs, gains, and losses, net | 90,562 | 51,661
Total segment expense | 605,604 | 361,001
Corporate & other: |  |
Income before income tax expense | 232,410 | 133,296
Operating Segments | Financial Services |  |
Segment Reporting Information [Line Items] |  |
Revenue | 713,661 | 372,630
Personnel costs | 411,302 | 216,615
Facility costs | 23,710 | 12,335
Other costs, gains, and losses, net | 75,296 | 36,525
Total segment expense | 510,308 | 265,475
Corporate & other: |  |
Income before income tax expense | 203,353 | 107,155
Operating Segments | Benefits and Insurance Services |  |
Segment Reporting Information [Line Items] |  |
Revenue | 112,976 | 108,408
Personnel costs | 66,665 | 65,723
Facility costs | 3,208 | 3,182
Other costs, gains, and losses, net | 15,158 | 14,688
Total segment expense | 85,031 | 83,593
Corporate & other: |  |
Income before income tax expense | 27,945 | 24,815
Operating Segments | National Practices |  |
Segment Reporting Information [Line Items] |  |
Revenue | 11,377 | 13,259
Personnel costs | 10,155 | 11,422
Facility costs | 2 | 63
Other costs, gains, and losses, net | 108 | 448
Total segment expense | 10,265 | 11,933
Corporate & other: |  |
Income before income tax expense | 1,112 | 1,326
Corporate And Eliminations |  |
Corporate & other: |  |
Unallocated corporate operating expenses | 3,797 | 15,354
General & administrative expenses | 28,070 | 18,711
Interest expense | 25,156 | 4,511
Other (expense) income, net | $ 2,477 | $ (9,294)

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