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Acquisitions - Additional Information (Detail) $ in Thousands | 6 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) Client_List shares | Sep. 30, 2017 USD ($) Client_List shares | Dec. 31, 2017 USD ($)
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |
Goodwill |  |  | $ 560,712 |  | $ 528,424
Contingent consideration | $ 12,400 | $ 17,500 | 12,400 | $ 17,500 |
Fair value of contingent consideration |  |  | 3,300 | (200) |
Consideration paid in cash |  |  | $ 11,000 | $ 4,800 |
Consideration paid in cash | $ 23,400 | $ 23,700 |  |  |
Number of common stock issued | shares |  |  | 100,000 | 200,000 |
CMF Associates, LLC (“CMF”), Slaton Insurance (“Slaton”) and Pacific Coastal Pension and Insurance Services, Inc. (Pacific Coastal”) [Member] |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |
Goodwill |  |  | $ 32,255 | $ 39,460 |
Acquisition of Client Lists [Member] |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |
Number of client list purchased | Client_List |  |  |  | 2 |
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 |  |  |  | 1 |
Contingent consideration |  |  |  | $ 700 |
Acquisition of Client Lists [Member] | Financial Services Practice Group [Member] |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |
Number of client list purchased | Client_List |  |  | 1 | 1 |
Contingent consideration |  |  | $ 300 | $ 700 |
Previous Client List Purchases [Member] |  |  |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |  |  |
Consideration paid in cash |  |  | $ 1,100 | $ 1,000 |

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