| Cover | Mar. 16, 2021 |
| Schedule of Capitalization, Equity [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 16, 2021 |
| Entity File Number | 001-38990 |
| Entity Registrant Name | Advantage Solutions Inc. |
| Entity Central Index Key | 0001776661 |
| Entity Tax Identification Number | 83-4629508 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 18100 Von Karman Avenue |
| Entity Address, Address Line Two | Suite 1000 |
| Entity Address, City or Town | Irvine |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 92612 |
| City Area Code | (949) |
| Local Phone Number | 797-2900 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Class A common stock, $0.0001 par value per share | |
| Schedule of Capitalization, Equity [Line Items] | |
| Title of 12(b) Security | Class A common stock, $0.0001 par value per share |
| Trading Symbol | ADV |
| Security Exchange Name | NASDAQ |
| Warrants to purchase Class A common stock | |
| Schedule of Capitalization, Equity [Line Items] | |
| Title of 12(b) Security | Warrants to purchase Class A common stock |
| Trading Symbol | ADVWW |
| Security Exchange Name | NASDAQ |
