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Revenue - Summary of Disaggregation of Revenue by Source (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | $ 239,790 | $ 224,249 | $ 745,286 | $ 722,980
Financial Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 153,794 | 146,145 | 493,311 | 478,485
Benefits and Insurance Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 76,960 | 70,069 | 225,342 | 220,152
National Practices [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 9,036 | 8,035 | 26,633 | 24,343
Accounting, Tax, Advisory and Consulting [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 153,794 | 146,145 | 493,311 | 478,485
Accounting, Tax, Advisory and Consulting [Member] | Financial Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 153,794 | 146,145 | 493,311 | 478,485
Core Benefits and Insurance Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 73,409 | 67,192 | 216,394 | 210,292
Core Benefits and Insurance Services [Member] | Benefits and Insurance Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 73,409 | 67,192 | 216,394 | 210,292
Non-core Benefits and Insurance Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 3,551 | 2,877 | 8,948 | 9,860
Non-core Benefits and Insurance Services [Member] | Benefits and Insurance Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 3,551 | 2,877 | 8,948 | 9,860
Managed Networking, Hardware Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 6,553 | 5,902 | 19,499 | 18,211
Managed Networking, Hardware Services [Member] | National Practices [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 6,553 | 5,902 | 19,499 | 18,211
National Practices Consulting [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 2,483 | 2,133 | 7,134 | 6,132
National Practices Consulting [Member] | National Practices [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | $ 2,483 | $ 2,133 | $ 7,134 | $ 6,132

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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