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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross | $ 824,730 | $ 767,070 | $ 672,200
Accumulated impairment | (83,987) | (83,987) | (83,987)
Goodwill [Roll Forward] |  |  |
Beginning balance, Goodwill | 683,083 | 588,213 |
Additions | 60,446 | 97,439 |
Divestitures and other adjustment | (2,786) | (2,569) |
Ending balance, Goodwill | 740,743 | 683,083 |
Financial Services |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross | 470,732 | 412,086 | 378,294
Accumulated impairment | (44,047) | (44,047) | (44,047)
Goodwill [Roll Forward] |  |  |
Beginning balance, Goodwill | 368,039 | 334,247 |
Additions | 58,646 | 34,785 |
Divestitures and other adjustment | 0 | (993) |
Ending balance, Goodwill | 426,685 | 368,039 |
Benefits and Insurance Services |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross | 320,125 | 321,111 | 260,033
Accumulated impairment | (7,733) | (7,733) | (7,733)
Goodwill [Roll Forward] |  |  |
Beginning balance, Goodwill | 313,378 | 252,300 |
Additions | 1,800 | 62,654 |
Divestitures and other adjustment | (2,786) | (1,576) |
Ending balance, Goodwill | 312,392 | 313,378 |
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 adjustment | 0 | 0 |
Ending balance, Goodwill | $ 1,666 | $ 1,666 |

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