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Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 1,591,194 | $ 1,411,979 | $ 1,104,925
Financial Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 1,160,686 | 1,010,068 | 734,026
Benefits and Insurance Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 382,605 | 358,007 | 332,323
National Practices |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 47,903 | 43,904 | 38,576
Accounting, tax, advisory and consulting |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 1,160,686 | 1,010,068 | 734,026
Accounting, tax, advisory and consulting | Financial Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 1,160,686 | 1,010,068 | 734,026
Core Benefits and Insurance Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 365,848 | 342,063 | 319,684
Core Benefits and Insurance Services | Benefits and Insurance Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 365,848 | 342,063 | 319,684
Non-core Benefits and Insurance Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 16,757 | 15,944 | 12,639
Non-core Benefits and Insurance Services | Benefits and Insurance Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 16,757 | 15,944 | 12,639
Managed networking, hardware services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 36,984 | 33,503 | 28,456
Managed networking, hardware services | National Practices |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 36,984 | 33,503 | 28,456
National Practices consulting |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 10,919 | 10,401 | 10,120
National Practices consulting | National Practices |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 10,919 | $ 10,401 | $ 10,120

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