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Revenue - Summary of Disaggregation of Revenue by Source (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Disaggregation Of Revenue [Line Items] |  |
Total revenue | $ 269,998 | $ 266,090
Accounting, Tax, Advisory and Consulting [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 185,144 | 180,603
Core Benefits and Insurance [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 73,538 | 74,122
Non-core Benefits and Insurance [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 2,717 | 3,208
Managed Networking, Hardware Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 6,424 | 5,958
National Practices Consulting [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 2,175 | 1,969
Other [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue |  | 230
Financial Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 185,144 | 180,603
Financial Services [Member] | Accounting, Tax, Advisory and Consulting [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 185,144 | 180,603
Benefits and Insurance Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 76,255 | 77,330
Benefits and Insurance Services [Member] | Core Benefits and Insurance [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 73,538 | 74,122
Benefits and Insurance Services [Member] | Non-core Benefits and Insurance [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 2,717 | 3,208
National Practices [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 8,599 | 8,157
National Practices [Member] | Managed Networking, Hardware Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 6,424 | 5,958
National Practices [Member] | National Practices Consulting [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | $ 2,175 | 1,969
National Practices [Member] | Other [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue |  | $ 230

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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