Quarterly report pursuant to Section 13 or 15(d)

Equity - Additional Information (Detail)

v3.21.2
Equity - Additional Information (Detail) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2021
May 31, 2021
Mar. 31, 2021
Jan. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Class Of Stock [Line Items]                    
Partnership distributions, amount         $ 3,592   $ 2,798   $ 5,350 $ 5,024
Distributions of partner incentive allocations of net income                 27,819 27,240
Class B Common Stock                    
Class Of Stock [Line Items]                    
Share conversion, Shares         (11,000) (8,000) (12,000) (176,000)    
Issuance of common stock       34,196 2,000 56,000        
Class B Common Stock | Neosho                    
Class Of Stock [Line Items]                    
Issuance of common stock in connection with acquisition 1,740                  
Class B Common Stock | Restricted Stock                    
Class Of Stock [Line Items]                    
Issuance of common stock   20,876   21,598            
Class B Common Stock | Resale And Registration Rights Agreement                    
Class Of Stock [Line Items]                    
Share conversion, Shares 5,864 4,743 7,605              
Class B Common Stock | Silvercrest L.P                    
Class Of Stock [Line Items]                    
Issuance of common stock       34,196            
Class A Common Stock                    
Class Of Stock [Line Items]                    
Share conversion, Shares         11,000 8,000 12,000 176,000    
Issuance of common stock   856                
Class A Common Stock | Restricted Stock                    
Class Of Stock [Line Items]                    
Issuance of common stock   856                
Silvercrest L.P                    
Class Of Stock [Line Items]                    
Accrued partner incentive allocations         $ 9,012   $ 5,557   $ 17,015 $ 12,934