Annual report pursuant to Section 13 and 15(d)

Equity - Class B Common Stock (Detail)

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Equity - Class B Common Stock (Detail) - Class B Common Stock - shares
 1 Months Ended 12 Months Ended
Dec. 31, 2019
Nov. 30, 2019
Aug. 31, 2019
Jul. 31, 2019
Jun. 30, 2019
May 31, 2019
Mar. 31, 2019
Jan. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Class Of Stock [Line Items]                        
Common stock conversion date 2019-12 2019-11 2019-08   2019-06 2019-05 2019-03          
Stock issued upon vesting of restricted stock units, Transaction date     2019-08     2019-05            
Common stock, shares outstanding 5,031,017               5,031,017 4,934,103 5,059,000 4,866,000
Cancellation of Class B common stock upon conversion of Class B units to Class A common stock (133,812) (16,054)             810,000 374,000 63,000  
Issuance of Class B common stock upon vesting of restricted stock units     241,624     948     665,000 6,000 13,000  
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 (133,812) (16,054) (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