Annual report pursuant to Section 13 and 15(d)

Equity - Summary of Authorized and Outstanding Equity (Detail)

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Equity - Summary of Authorized and Outstanding Equity (Detail) - shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Preferred shares        
Preferred stock, shares authorized 10,000,000 10,000,000    
Preferred stock, shares outstanding 0 0    
Class A Common Stock        
Common shares        
Common stock, shares authorized 50,000,000 50,000,000    
Common stock, shares outstanding 9,650,692 9,329,879 8,518,000 8,142,000
Common stock, voting rights one vote for each share      
Class B Common Stock        
Common shares        
Common stock, shares authorized 25,000,000 25,000,000    
Common stock, shares outstanding 4,721,646 5,031,017 4,934,000 5,059,000
Common stock, voting rights one vote for each share