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
 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 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 9,653,214 9,670,000 9,658,000 9,650,692 9,545,000 9,520,000 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 4,815,460 4,782,000 4,770,000 4,721,646 4,828,000 4,852,000 4,855,000 5,031,000
Common stock, voting rights one vote for each share