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Acquisitions - Additional Information (Detail) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 USD ($) Business Client_List shares | Sep. 30, 2018 USD ($) Business Client_List shares | Dec. 31, 2018 USD ($)
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of businesses acquired | Business | 6 | 2 |
Consideration paid in cash | $ 19,400,000 | $ 23,400,000 |
Consideration paid in common stock | 2,000,000.0 | 900,000 |
Contingent consideration | 11,200,000 | 12,400,000 |
Cash | 800,000 |  |
Acquired client funds | 6,900,000 |  |
Contingent consideration arrangements - High | 11,600,000 |  |
Aggregate fair value of contingent consideration | 10,300,000 |  |
Contingent consideration, current | 15,839,000 |  | $ 22,538,000
Contingent consideration, non-current | 16,030,000 |  | 17,170,000
Annual aggregate revenue | 17,400,000 | 9,100,000 |
Goodwill | 588,213,000 |  | $ 564,300,000
Changes in fair value of contingent consideration | 300,000 | 3,300,000 |
Consideration paid in cash | $ 16,300,000 | $ 11,000,000.0 |
Number of common stock issued | shares | 98,000 | 66,000 |
Contingent Purchase Price Liability – Current [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Contingent consideration, current | $ 2,900,000 | $ 3,400,000 |
Contingent Purchase Price Liability – Non-current [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Contingent consideration, non-current | $ 7,400,000 | $ 9,000,000.0 |
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. |  |
InR Advisory Services, LLC [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Effective date of acquisition |  | Apr. 01, 2018 |
Acquired entity, name |  | InR Advisory Services, LLC |
Laurus Transaction Advisors, LLC [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Effective date of acquisition |  | Feb. 01, 2018 |
Acquired entity, name |  | Laurus Transaction Advisors, LLC |
Jun. 30, 2019 InR Advisory Services, LLC (“InR”) and Laurus Transaction Advisors, LLC (“Laurus”) [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Goodwill | $ 24,400,000 | $ 32,300,000 |
Acquisition of Client Lists [Member] | Benefits and Insurance Services Practice Group [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Contingent consideration | $ 200,000 |  |
Number of client lists purchased | Client_List | 1 |  |
Consideration transferred | $ 300,000 |  |
Acquisition of Client Lists [Member] | Financial Services Practice Group [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Contingent consideration |  | $ 300,000 |
Number of client lists purchased | Client_List |  | 1 |
Previous Client List Purchases [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash | $ 700,000 | $ 1,100,000 |

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