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SEGMENT DISCLOSURES - Schedule of Disaggregation of Revenue by Source (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 438,884 | $ 410,539 | $ 1,353,193 | $ 1,263,647
Financial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 322,295 | 298,372 | 1,004,158 | 932,388
Benefits and Insurance Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 104,040 | 100,287 | 309,867 | 296,179
National Practices |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 12,549 | 11,880 | 39,168 | 35,080
Accounting, tax, advisory and consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 322,295 | 298,372 | 1,004,158 | 932,388
Accounting, tax, advisory and consulting | Financial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 322,295 | 298,372 | 1,004,158 | 932,388
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 | 99,950 | 95,951 | 298,688 | 283,599
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 | 99,950 | 95,951 | 298,688 | 283,599
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 | 4,090 | 4,336 | 11,179 | 12,580
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 | 4,090 | 4,336 | 11,179 | 12,580
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 | 10,336 | 9,205 | 30,774 | 27,226
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 | 10,336 | 9,205 | 30,774 | 27,226
National practices consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,213 | 2,675 | 8,394 | 7,854
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 | $ 2,213 | $ 2,675 | $ 8,394 | $ 7,854

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