Silvercrest Asset Management Group LLC Annual report pursuant to Section 13 and 15(d)

Equity - Class B Common Stock (Detail) - shares	1 Months Ended							12 Months Ended
Equity - Class B Common Stock (Detail) - shares	Dec. 31, 2020	Nov. 30, 2020	Aug. 31, 2020	Jun. 30, 2020	May 31, 2020	Mar. 31, 2020	Feb. 29, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Class Of Stock [Line Items]
Cancellation of Class B common stock upon conversion of Class B units to Class A common stock			(24,191)
Class B Common Stock
Class Of Stock [Line Items]
Common stock conversion date	2020-12	2020-11	2020-08	2020-06	2020-05	2020-03	2020-02
Issuance of Class B common stock upon vesting of restricted stock units					2020-05
Common stock, shares outstanding	4,721,646							4,721,646	5,031,017	4,934,000	5,059,000
Cancellation of Class B common stock upon conversion of Class B units to Class A common stock	(69,724)	(36,361)			(7,355)			318,000	810,000	374,000
Issuance of Class B common stock upon vesting of restricted stock units					9,546				665,000	6,000
Class B Common Stock \| 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	(69,724)	(36,361)	(24,191)	(5,400)	(7,355)	(20,662)	(155,224)