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Revenue - Summary of Disaggregation of Revenue by Source (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue | $ 232,641 | $ 232,641 | $ 211,016 | $ 498,731 | $ 452,475
Accounting, Tax, Advisory and Consulting [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue |  | 151,737 |  | 332,340 |
Managed Networking, Hardware Services [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue |  | 6,121 |  | 12,079 |
National Practices Consulting [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue |  | 2,030 |  | 3,999 |
Core Benefits and Insurance Services [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue |  | 68,978 |  | 143,100 |
Non-core Benefits and Insurance Services [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue |  | 3,775 |  | 6,983 |
Other National Practices [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue |  |  |  | 230 |
Financial Services [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue |  | 151,737 |  | 332,340 |
Financial Services [Member] | Accounting, Tax, Advisory and Consulting [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue |  | 151,737 |  | 332,340 |
Benefits and Insurance Services [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue |  | 72,753 |  | 150,083 |
Benefits and Insurance Services [Member] | Core Benefits and Insurance Services [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue |  | 68,978 |  | 143,100 |
Benefits and Insurance Services [Member] | Non-core Benefits and Insurance Services [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue |  | 3,775 |  | 6,983 |
National Practices [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue |  | 8,151 |  | 16,308 |
National Practices [Member] | Managed Networking, Hardware Services [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue |  | 6,121 |  | 12,079 |
National Practices [Member] | National Practices Consulting [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue |  | $ 2,030 |  | 3,999 |
National Practices [Member] | Other National Practices [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue |  |  |  | $ 230 |

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