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Business Combinations - Additional Information (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) business | Dec. 31, 2020 USD ($) business | Dec. 31, 2019 USD ($)
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Annual aggregate revenue | $ 74,400 | $ 45,200 |
Proceeds from sales of divested operations | $ 9,710 | $ 711 | $ 3
Benefits and Insurance Services |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of businesses sold | business | 1 |  |
Proceeds from sales of divested operations | $ 9,700 |  |
Gain (loss) on disposition of business | $ 6,300 |  |
Financial Services |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of businesses sold | business |  | 2 |
Gain (loss) on disposition of business |  | $ (500) |
Client lists |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Acquired finite-lived intangible assets, useful life | 10 years |  |
Other intangibles |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Acquired finite-lived intangible assets, useful life | 3 years |  |

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