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Business Combinations - Additional Information (Detail) shares in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 USD ($) Client_List shares | Sep. 30, 2019 USD ($) Business Client_List shares | Dec. 31, 2019 USD ($)
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash | $ 35,500,000 | $ 19,400,000 |
Consideration paid in common stock | 3,500,000 | 2,000,000.0 |
Contingent consideration | 16,300,000 | 11,200,000 |
Contingent consideration arrangements - High | 18,700,000 | 11,600,000 |
Aggregate fair value of contingent consideration | 16,400,000 | 10,300,000 |
Contingent consideration, current | 15,430,000 |  | $ 16,193,000
Contingent consideration, non-current | 18,678,000 |  | $ 15,896,000
Annual revenue | 24,600,000 | $ 17,400,000 |
Number of businesses acquired | Business |  | 6 |
Cash |  | $ 800,000 |
Acquired client funds |  | 6,900,000 |
Business combination contingent consideration liability other adjustments based on projected future results of acquisition | (100,000) | 300,000 |
Consideration paid in cash | $ 10,900,000 | $ 16,300,000 |
Number of common stock issued | shares | 0.1 | 0.1 |
Contingent Purchase Price Liability – Current [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Contingent consideration, current | $ 5,000,000.0 | $ 2,900,000 |
Contingent Purchase Price Liability – Non-current [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Contingent consideration, non-current | $ 11,400,000 | 7,400,000 |
Alliance Insurance Services, Inc. [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Effective date of acquisition | Feb. 01, 2020 |  |
Acquired entity, name | Alliance Insurance Services, Inc. |  |
Pension Dynamics Company, LLC [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Effective date of acquisition | Feb. 01, 2020 |  |
Acquired entity, name | Pension Dynamics Company, LLC |  |
Sunshine Systems [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Effective date of acquisition | Feb. 01, 2020 |  |
Acquired entity, name | Sunshine Systems |  |
Prince-Wood Insurance, L.L.C [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Effective date of acquisition | Jul. 01, 2020 |  |
Acquired entity, name | Prince-Wood Insurance, L.L.C |  |
ARC Consulting LLC and ARC Placement Group LLC [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Effective date of acquisition | Sep. 01, 2020 |  |
Acquired entity, name | ARC Consulting LLC and ARC Placement Group LLC |  |
Wenner Group, LLC [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Effective date of acquisition | Jan. 01, 2019 |  |
Acquired entity, name | Wenner Group, LLC |  |
Paydayta, Inc. [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Effective date of acquisition | Jul. 01, 2019 |  |
Acquired entity, name | Paydayta, Inc. |  |
Gavion, LLC [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Effective date of acquisition | Jul. 01, 2019 |  |
Acquired entity, name | Gavion, LLC |  |
QBA Benefits, LLC. [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Effective date of acquisition | Aug. 01, 2019 |  |
Acquired entity, name | QBA Benefits, LLC. |  |
Ericson CPAs [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Effective date of acquisition | Aug. 01, 2019 |  |
Acquired entity, name | Ericson CPAs |  |
Brinig Taylor Zimmer, Inc. [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Effective date of acquisition | Sep. 01, 2019 |  |
Acquired entity, name | Brinig Taylor Zimmer, Inc. |  |
Series of Business Acquisition [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Goodwill | $ 48,600,000 | 24,400,000 |
Acquisition of Client Lists [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash | 600,000 | 300,000 |
Contingent consideration | $ 300,000 | $ 200,000 |
Acquisition of Client Lists [Member] | Benefits and Insurance Services Practice Group [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of client list purchased | Client_List | 2 | 1 |
Acquisition of Client Lists [Member] | Financial Service Practice Group [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of client list purchased | Client_List | 1 |  |
Previous Client List Purchases [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash | $ 500,000 | $ 700,000 |

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