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Goodwill and Other Intangible Assets, Net - Changes in Carrying Amount of Goodwill by Operating Segment (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross | $ 949,167 | $ 903,904 | $ 824,730
Accumulated impairment | (83,987) | (83,987) | (83,987)
Goodwill [Roll Forward] |  |  |
Beginning balance, Goodwill | 819,917 | 740,743 |
Additions | 45,254 | 79,147 |
Divestitures and other adjustments | 9 | 27 |
Ending balance, Goodwill | 865,180 | 819,917 |
Financial Services |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross | 591,237 | 549,906 | 470,732
Accumulated impairment | (44,047) | (44,047) | (44,047)
Goodwill [Roll Forward] |  |  |
Beginning balance, Goodwill | 505,859 | 426,685 |
Additions | 41,322 | 79,147 |
Divestitures and other adjustments | 9 | 27 |
Ending balance, Goodwill | 547,190 | 505,859 |
Benefits and Insurance Services |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross | 324,057 | 320,125 | 320,125
Accumulated impairment | (7,733) | (7,733) | (7,733)
Goodwill [Roll Forward] |  |  |
Beginning balance, Goodwill | 312,392 | 312,392 |
Additions | 3,932 | 0 |
Divestitures and other adjustments | 0 | 0 |
Ending balance, Goodwill | 316,324 | 312,392 |
National Practices |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross | 33,873 | 33,873 | 33,873
Accumulated impairment | (32,207) | (32,207) | $ (32,207)
Goodwill [Roll Forward] |  |  |
Beginning balance, Goodwill | 1,666 | 1,666 |
Additions | 0 | 0 |
Divestitures and other adjustments | 0 | 0 |
Ending balance, Goodwill | $ 1,666 | $ 1,666 |

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