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Business Combinations - Additional Information (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2021 USD ($) business | Jun. 30, 2020 USD ($)
Business Acquisition, Contingent Consideration [Line Items] |  |
Annual revenue | $ 41,900 | $ 6,100
Annual income before tax | 6,100 | 1,500
Proceeds from sales of divested operations | $ 9,785 | $ 651
Client List |  |
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 |
Benefits and Insurance Services Practice Group |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Number of businesses sold | business | 1 |
Proceeds from sales of divested operations | $ 9,700 |
Gain from the sale of its individual wealth management business | $ 6,400 |

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