Annual report pursuant to Section 13 and 15(d)

Acquisitions - Summary of Total Purchase Consideration (Detail)

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Acquisitions - Summary of Total Purchase Consideration (Detail) - Cortina Asset Management, LLC
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]  
Cash paid on date of acquisition $ 17,072
Term loan with City National Bank drawdown 18,000
Units issued 8,952
Contingent consideration 13,800
Total purchase consideration $ 57,824