Annual report pursuant to Section 13 and 15(d)

Acquisitions - Summary of Pro Forma Information (Detail)

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Acquisitions - Summary of Pro Forma Information (Detail) - Cortina Asset Management, LLC - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]    
Revenue $ 108,345 $ 112,941
Net Income $ 15,990 $ 20,422