Quarterly report pursuant to Section 13 or 15(d)

Equity - Class B Common Stock (Detail)

v3.19.2
Equity - Class B Common Stock (Detail) - Class B Common Stock - shares
 1 Months Ended 3 Months Ended
Jun. 30, 2019
May 31, 2019
Mar. 31, 2019
Jan. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Class Of Stock [Line Items]                    
Common stock conversion date   2019-05 2019-03   2019-06          
Stock issued upon vesting of restricted stock units, Transaction date   2019-05                
Common stock, shares outstanding 4,832,839   4,919,000   4,832,839 4,919,000 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         87,000 17,000 45,000 117,000    
Issuance of Class B shares, Shares   948       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 (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 Neosho Acquisition       1,516