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, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 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 9,180,013 8,624,000 8,535,000 8,518,096 8,346,000 8,306,000 8,259,000 8,142,000
Common stock, voting rights 1 vote per share              
Class B Common Stock                
Common shares                
Common stock, shares authorized 25,000,000     25,000,000        
Common stock, shares outstanding 5,180,883 4,833,000 4,919,000 4,934,103 5,107,000 4,905,000 4,942,000 5,059,000
Common stock, voting rights 1 vote per share