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Acquisitions - Additional Information (Detail) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 USD ($) Client_List shares | Mar. 31, 2018 USD ($) Client_List shares | Dec. 31, 2018 USD ($)
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Goodwill | $ 566,009 |  | $ 564,300
Changes in fair value of contingent consideration | (300) | $ 1,600 |
Consideration paid in cash | $ 2,700 | $ 2,900 |
Number of common stock issued | shares | 0 | 0 |
Wenner Group, LLC [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Goodwill | $ 2,165 |  |
Laurus Transaction Advisors, LLC [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Goodwill |  | $ 22,943 |
Acquisition of Client Lists [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of client list purchased | Client_List | 0 | 0 |

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