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Segment Disclosures - Summary of Disaggregation of Revenue by Source (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | $ 278,648 | $ 236,943 | $ 579,378 | $ 514,398
Financial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 186,589 | 154,083 | 390,738 | 342,860
Benefits & Insurance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 82,620 | 73,940 | 169,859 | 153,552
National Practices |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 9,439 | 8,920 | 18,781 | 17,986
Accounting, tax, advisory and consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 186,589 | 154,083 | 390,738 | 342,860
Accounting, tax, advisory and consulting | Financial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 186,589 | 154,083 | 390,738 | 342,860
Accounting, tax, advisory and consulting | Benefits & Insurance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 0 | 0 | 0 | 0
Accounting, tax, advisory and consulting | National Practices |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 0 | 0 | 0 | 0
Core benefits and insurance services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 79,288 | 71,393 | 163,358 | 147,865
Core benefits and insurance services | Financial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 0 | 0 | 0 | 0
Core benefits and insurance services | Benefits & Insurance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 79,288 | 71,393 | 163,358 | 147,865
Core benefits and insurance services | National Practices |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 0 | 0 | 0 | 0
Non-core benefits and insurance services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 3,332 | 2,547 | 6,501 | 5,687
Non-core benefits and insurance services | Financial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 0 | 0 | 0 | 0
Non-core benefits and insurance services | Benefits & Insurance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 3,332 | 2,547 | 6,501 | 5,687
Non-core benefits and insurance services | National Practices |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 0 | 0 | 0 | 0
Managed networking, hardware services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 6,969 | 6,581 | 13,864 | 13,156
Managed networking, hardware services | Financial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 0 | 0 | 0 | 0
Managed networking, hardware services | Benefits & Insurance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 0 | 0 | 0 | 0
Managed networking, hardware services | National Practices |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 6,969 | 6,581 | 13,864 | 13,156
National practices consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 2,470 | 2,339 | 4,917 | 4,830
National practices consulting | Financial Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 0 | 0 | 0 | 0
National practices consulting | Benefits & Insurance |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 0 | 0 | 0 | 0
National practices consulting | National Practices |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | $ 2,470 | $ 2,339 | $ 4,917 | $ 4,830

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