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Segment Disclosures - Summary of Disaggregation of Revenue by Source (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 410,539 | $ 363,262 | $ 1,263,647 | $ 1,116,936
Financial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 298,372 | 259,998 | 932,388 | 808,052
Benefits and Insurance Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 100,287 | 92,067 | 296,179 | 276,261
National Practices |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 11,880 | 11,197 | 35,080 | 32,623
Accounting, tax, advisory and consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 298,372 | 259,998 | 932,388 | 808,052
Accounting, tax, advisory and consulting | Financial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 298,372 | 259,998 | 932,388 | 808,052
Accounting, tax, advisory and consulting | Benefits and Insurance Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Accounting, tax, advisory and consulting | National Practices |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Core benefits and insurance services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 95,951 | 88,364 | 283,599 | 264,666
Core benefits and insurance services | Financial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Core benefits and insurance services | Benefits and Insurance Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 95,951 | 88,364 | 283,599 | 264,666
Core benefits and insurance services | National Practices |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Non-core benefits and insurance services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 4,336 | 3,703 | 12,580 | 11,595
Non-core benefits and insurance services | Financial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Non-core benefits and insurance services | Benefits and Insurance Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 4,336 | 3,703 | 12,580 | 11,595
Non-core benefits and insurance services | National Practices |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Managed networking, hardware services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 9,205 | 8,514 | 27,226 | 24,768
Managed networking, hardware services | Financial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Managed networking, hardware services | Benefits and Insurance Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Managed networking, hardware services | National Practices |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 9,205 | 8,514 | 27,226 | 24,768
National practices consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,675 | 2,683 | 7,854 | 7,855
National practices consulting | Financial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
National practices consulting | Benefits and Insurance Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
National practices consulting | National Practices |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 2,675 | $ 2,683 | $ 7,854 | $ 7,855

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