Annual report pursuant to Section 13 and 15(d)

Acquisitions - Summary of Amounts Preliminarily Allocated to Acquired Assets and Assumed Liabilities (Parenthetical) (Detail)

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Acquisitions - Summary of Amounts Preliminarily Allocated to Acquired Assets and Assumed Liabilities (Parenthetical) (Detail)
12 Months Ended
Dec. 31, 2019
Cortina Asset Management, LLC | Customer Relationships  
Business Acquisition [Line Items]  
Customer relationships term 15 years