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Revenue - Summary of Disaggregation of Revenue by Source (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | $ 235,498 | $ 232,641 | $ 505,496 | $ 498,731
Financial Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 154,373 | 151,737 | 339,517 | 332,340
Benefits and Insurance Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 72,127 | 72,753 | 148,382 | 150,083
National Practices [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 8,998 | 8,151 | 17,597 | 16,308
Accounting, Tax, Advisory and Consulting [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 154,373 | 151,737 | 339,517 | 332,340
Accounting, Tax, Advisory and Consulting [Member] | Financial Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 154,373 | 151,737 | 339,517 | 332,340
Core Benefits and Insurance Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 69,447 | 68,978 | 142,985 | 143,100
Core Benefits and Insurance Services [Member] | Benefits and Insurance Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 69,447 | 68,978 | 142,985 | 143,100
Non-core Benefits and Insurance Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 2,680 | 3,775 | 5,397 | 6,983
Non-core Benefits and Insurance Services [Member] | Benefits and Insurance Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 2,680 | 3,775 | 5,397 | 6,983
Managed Networking, Hardware Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 6,522 | 6,121 | 12,946 | 12,079
Managed Networking, Hardware Services [Member] | National Practices [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 6,522 | 6,121 | 12,946 | 12,079
National Practices Consulting [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 2,476 | 2,030 | 4,651 | 3,999
National Practices Consulting [Member] | National Practices [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | $ 2,476 | $ 2,030 | $ 4,651 | 3,999
Other National Practices [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue |  |  |  | 230
Other National Practices [Member] | National Practices [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue |  |  |  | $ 230

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