Quarterly report pursuant to Section 13 or 15(d)

Equity - Class B Common Stock (Detail)

v3.19.3
Equity - Class B Common Stock (Detail) - Class B Common Stock - shares
 1 Months Ended 3 Months Ended
Aug. 31, 2019
Jul. 31, 2019
Jun. 30, 2019
May 31, 2019
Mar. 31, 2019
Jan. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Class Of Stock [Line Items]                            
Common stock conversion date 2019-08     2019-05 2019-03     2019-06            
Stock issued upon vesting of restricted stock units, Transaction date 2019-08     2019-05                    
Common stock, shares outstanding     4,833,000   4,919,000   5,180,883 4,833,000 4,919,000 5,107,000 4,905,000 4,942,000 4,934,103 5,059,000
Cancellation of Class B common stock upon conversion of Class B units to Class A common stock             556,000 87,000 17,000 40,000 45,000 117,000    
Issuance of Class B shares, Shares 241,624     948     663,000   2,000   6,000      
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 (556,293)   (2,386) (84,268) (17,074)                  
Neosho                            
Class Of Stock [Line Items]                            
Common stock issuance date           2019-01                
Issuance of Class B common stock in connection with the Acquisition           1,516                
Cortina                            
Class Of Stock [Line Items]                            
Common stock issuance date   2019-07                        
Issuance of Class B common stock in connection with the Acquisition   662,713                        
Cortina | Resale And Registration Rights Agreement                            
Class Of Stock [Line Items]                            
Issuance of Class B common stock in connection with the Acquisition   662,713