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Revenue - Summary of Disaggregation of Revenue by Source (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation Of Revenue [Line Items]
Total revenue	$ 203,138	$ 239,790	$ 235,498	$ 269,998	$ 199,023	$ 224,249	$ 232,641	$ 266,090	$ 948,424	$ 922,003	$ 855,340
Financial Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									616,567	600,926
Benefits and Insurance Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									296,228	288,437
National Practices [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									35,629	32,640
Accounting, Tax, Advisory and Consulting [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									616,567	600,926
Accounting, Tax, Advisory and Consulting [Member] | Financial Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									616,567	600,926
Core Benefits and Insurance Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									283,783	276,496
Core Benefits and Insurance Services [Member] | Benefits and Insurance Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									283,783	276,496
Non-core Benefits and Insurance Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									12,445	11,941
Non-core Benefits and Insurance Services [Member] | Benefits and Insurance Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									12,445	11,941
Managed Networking, Hardware Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									25,982	24,404
Managed Networking, Hardware Services [Member] | National Practices [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									25,982	24,404
National Practices Consulting [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									9,647	8,236
National Practices Consulting [Member] | National Practices [Member]
Disaggregation Of Revenue [Line Items]
Total revenue									$ 9,647	$ 8,236

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+ References

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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

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