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
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2016
Dec. 31, 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 10,138        
Common stock, shares outstanding 9,505,765   9,329,879 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 35,336        
Class of share exchangeable to another class one-for-one basis        
Common stock, shares outstanding 4,855,131   5,031,017 4,919,000 4,934,000