Quarterly report pursuant to Section 13 or 15(d)

Equity - Summary of Authorized and Outstanding Equity (Detail)

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Equity - Summary of Authorized and Outstanding Equity (Detail) - shares
 3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
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 9,658,297 9,650,692 9,506,000 9,330,000
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 4,769,835 4,721,646 4,855,000 5,031,000
Common stock, voting rights one vote for each share