Quarterly report pursuant to Section 13 or 15(d)

Equity - Summary of Authorized and Outstanding Equity (Detail)

v3.19.2
Equity - Summary of Authorized and Outstanding Equity (Detail) - shares
 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 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 8,623,720 8,535,000 8,518,096 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 4,832,839 4,919,000 4,934,103 4,905,000 4,942,000 5,059,000
Common stock, voting rights 1 vote per share