| Document and Entity Information | Nov. 04, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Nov. 4, 2021 |
| Entity Registrant Name | SILVERCREST ASSET MANAGEMENT GROUP INC. |
| Entity Central Index Key | 0001549966 |
| Entity Emerging Growth Company | false |
| Title of 12(b) Security | Class A common stock, $0.01 par value per share |
| Trading Symbol | SAMG |
| Security Exchange Name | NASDAQ |
| Entity File Number | 001-35733 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 45-5146560 |
| Entity Address, Address Line One | 1330 Avenue of the Americas |
| Entity Address, Address Line Two | 38th Floor |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10019 |
| City Area Code | 212 |
| Local Phone Number | 649-0600 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
