Quarterly report pursuant to Section 13 or 15(d)

Equity - Class B Common Stock (Detail)

v3.21.2
Equity - Class B Common Stock (Detail) - Class B Common Stock - shares
1 Months Ended 3 Months Ended
Aug. 31, 2021
Jul. 31, 2021
Jun. 30, 2021
May 31, 2021
Mar. 31, 2021
Jan. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Class Of Stock [Line Items]                            
Common stock, shares outstanding     4,782,000   4,770,000   4,815,460 4,782,000 4,770,000 4,828,000 4,852,000 4,855,000 4,721,646 5,031,000
Issuance of Class B common stock upon vesting of restricted stock units           34,196 44,000 2,000 56,000          
Cancellation of Class B common stock upon conversion of Class B units to Class A common stock             11,000 11,000 8,000 24,000 12,000 176,000    
Common stock conversion date           2021-01                
Neosho                            
Class Of Stock [Line Items]                            
Issuance of Class B common stock in connection with the Acquisition     1,740                      
Common stock conversion date     2021-06                      
Cortina                            
Class Of Stock [Line Items]                            
Issuance of Class B common stock in connection with the Acquisition   44,267                        
Common stock conversion date   2021-07                        
Restricted Stock                            
Class Of Stock [Line Items]                            
Issuance of Class B common stock upon vesting of restricted stock units       20,876   21,598                
Common stock conversion date       2021-05   2021-01                
Resale And Registration Rights Agreement                            
Class Of Stock [Line Items]                            
Cancellation of Class B common stock upon conversion of Class B units to Class A common stock (10,651)   (5,864) (4,743) (7,605)                  
Common stock conversion date 2021-08   2021-06 2021-05 2021-03