Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Summary of Pro Forma Information (Detail)

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Acquisitions - Summary of Pro Forma Information (Detail) - Cortina Asset Management, LLC
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Business Acquisition [Line Items]  
Revenue $ 52,662
Net Income $ 6,974