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Business Combinations - Additional Information (Detail) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 USD ($) Client_List shares | Mar. 31, 2019 USD ($) Client_List shares | Dec. 31, 2019 USD ($)
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash | $ 9,400,000 |  |
Consideration paid in common stock | 900,000 |  |
Contingent consideration | 4,800,000 |  |
Contingent consideration arrangements - High | 6,200,000 |  |
Aggregate fair value of contingent consideration | 4,700,000 |  |
Contingent consideration, current | 17,514,000 |  | $ 16,193,000
Contingent consideration, non-current | 15,167,000 |  | $ 15,896,000
Annual revenue | 6,100,000 |  |
Changes in fair value of contingent consideration | (700,000) | $ (300,000) |
Consideration paid in cash | $ 2,400,000 | $ 2,700,000 |
Number of common stock issued | shares | 100,000 | 0 |
Contingent Purchase Price Liability – Current [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Contingent consideration, current | $ 2,000,000.0 |  |
Contingent Purchase Price Liability – Non-current [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Contingent consideration, non-current | $ 2,700,000 |  |
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 |  |
Wenner Group, LLC [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Effective date of acquisition |  | Jan. 01, 2019 |
Acquired entity, name |  | Wenner Group, LLC |
Consideration paid in cash |  | $ 1,300,000 |
Contingent consideration |  | 1,800,000 |
Contingent consideration arrangements - High |  | 1,800,000 |
Annual revenue |  | 2,400,000 |
Wenner Group, LLC [Member] | Contingent Purchase Price Liability – Current [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Contingent consideration, current |  | 600,000 |
Wenner Group, LLC [Member] | Contingent Purchase Price Liability – Non-current [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Contingent consideration, non-current |  | 1,200,000 |
Series of Business Acquisition [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Goodwill | $ 11,200,000 | $ 2,200,000 |
Acquisition of Client Lists [Member] | Benefits and Insurance Services Practice Group [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash | 500,000 |  |
Contingent consideration | $ 300,000 |  |
Number of client list purchased | Client_List | 2 | 0 |
Previous Client List Purchases [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash | $ 300,000 | $ 300,000 |

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