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Revenue - Summary of Disaggregation of Revenue by Source (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation Of Revenue [Line Items] |  |  |
Revenue | $ 922,003 | $ 855,340 | $ 799,832
Financial Services [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue | 600,926 |  |
Benefits and Insurance Services [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue | 288,437 |  |
National Practices [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue | 32,640 |  |
Accounting, Tax, Advisory and Consulting [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue | 600,926 |  |
Accounting, Tax, Advisory and Consulting [Member] | Financial Services [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue | 600,926 |  |
Core Benefits and Insurance Services [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue | 276,496 |  |
Core Benefits and Insurance Services [Member] | Benefits and Insurance Services [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue | 276,496 |  |
Non-core Benefits and Insurance Services [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue | 11,941 |  |
Non-core Benefits and Insurance Services [Member] | Benefits and Insurance Services [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue | 11,941 |  |
Managed Networking, Hardware Services [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue | 24,404 |  |
Managed Networking, Hardware Services [Member] | National Practices [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue | 24,404 |  |
National Practices Consulting [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue | 8,236 |  |
National Practices Consulting [Member] | National Practices [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue | $ 8,236 |  |

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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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