Quarterly report pursuant to Section 13 or 15(d)

Equity - Summary of Authorized and Outstanding Equity (Parenthetical) (Detail)

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Equity - Summary of Authorized and Outstanding Equity (Parenthetical) (Detail) - $ / shares
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2016
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Class Of Stock [Line Items]              
Preferred stock, par value $ 0.01     $ 0.01      
Class A Common Stock              
Class Of Stock [Line Items]              
Common stock, par value $ 0.01     $ 0.01      
Common stock, voting rights one vote for each share            
Common stockholders rights percentage 100.00%            
Restricted stock units granted 8,242 10,582          
Restricted stock units unvested 8,242            
Common stock, shares outstanding 9,520,416   9,506,000 9,329,879 8,624,000 8,535,000 8,518,000
Class B Common Stock              
Class Of Stock [Line Items]              
Common stock, par value $ 0.01     $ 0.01      
Common stock, voting rights one vote for each share            
Restricted stock units granted 74,906            
Class of share exchangeable to another class one-for-one basis            
Common stock, shares outstanding 4,851,922   4,855,000 5,031,017 4,833,000 4,919,000 4,934,000