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Acquisitions - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) Business Client_List shares | Dec. 31, 2018 USD ($) Client_List shares | Dec. 31, 2017 USD ($)
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of businesses acquired | Business | 6 |  |
Consideration paid in cash | $ 19,400,000 | $ 27,900,000 |
Consideration paid in common stock | 2,000,000.0 | 900,000 |
Contingent consideration | 11,200,000 | 13,400,000 |
Cash | 800,000 | 300,000 |
Acquired client funds | 6,900,000 |  |
Contingent consideration arrangements - High | 11,500,000 | 15,300,000 |
Aggregate fair value of contingent consideration | 10,300,000 |  |
Contingent consideration, current | 16,193,000 | 22,538,000 |
Contingent consideration, non-current | 15,896,000 | 17,170,000 |
Annual aggregate revenue | 17,400,000 | 11,000,000.0 |
Fair value of obligation at acquisition date |  | 13,400,000 |
Goodwill | 588,213,000 | 564,300,000 | $ 528,424,000
Changes in fair value of contingent consideration | 1,600,000 | 2,600,000 |
Consideration paid in cash | $ 16,900,000 | $ 11,000,000.0 |
Number of common stock issued | shares | 100,000 | 100,000 |
Benefits and Insurance Services Practice Group [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Goodwill | $ 252,300,000 | $ 233,008,000 | 219,897,000
Financial Services Practice Group [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Goodwill | 334,247,000 | 329,626,000 | $ 306,861,000
Contingent Purchase Price Liability – Current [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Contingent consideration, current | 2,800,000 | 3,900,000 |
Contingent Purchase Price Liability – Non-current [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Contingent consideration, non-current | $ 7,500,000 | $ 9,500,000 |
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. |  |
Laurus Transaction Advisors, LLC. [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Effective date of acquisition |  | Feb. 01, 2018 |
Acquired entity, name |  | Laurus |
InR Advisory Services, LLC [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Effective date of acquisition |  | Apr. 01, 2018 |
Acquired entity, name |  | InR |
Sequoia Financial Group, LLC. [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Effective date of acquisition |  | Dec. 01, 2018 |
Acquired entity, name |  | Sequoia |
Dec. 31, 2020 InR Advisory Services, LLC (“InR”) and Laurus Transaction Advisors, LLC (“Laurus”) [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Goodwill | $ 24,400,000 | $ 36,100,000 |
Acquisition of Client Lists [Member] | Benefits and Insurance Services Practice Group [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash | 300,000 |  |
Contingent consideration | $ 200,000 |  |
Number of client list purchased | Client_List | 1 |  |
Acquisition of Client Lists [Member] | Financial Services Practice Group [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash |  | 300,000 |
Contingent consideration |  | $ 200,000 |
Number of client list purchased | Client_List |  | 1 |
Previous Client List Purchases [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash | $ 900,000 | $ 800,000 |

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