Quarterly report pursuant to Section 13 or 15(d)

Equity - Class A Common Stock (Detail)

v3.21.2
Equity - Class A Common Stock (Detail) - Class A Common Stock - shares
 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2021
Aug. 31, 2021
Jun. 30, 2021
May 31, 2021
Mar. 31, 2021
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Class Of Stock [Line Items]                        
Common stock, shares outstanding 9,653,214   9,670,000   9,658,000 9,653,214 9,653,214 9,650,692 9,545,000 9,520,000 9,506,000 9,330,000
Issuance of Class A common stock upon conversion of Class B units to Class A common stock   10,651 5,864 4,743 7,605              
Issuance of Class A common stock upon vesting of restricted stock units       856                
Purchase of shares of Class A common stock of Silvercrest Asset Management Group Inc. (27,197)         (27,000) (27,197)          
Common stock conversion date   2021-08 2021-06 2021-05 2021-03              
Issuance of Class A common stock upon vesting of restricted stock units, Transaction date       2021-05                
Purchase of shares of Class A common stock of Silvercrest Asset Management Group Inc., Transaction date 2021-09