Schedule I - Condensed Parent Only Financial Information - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets
Investments in unconsolidated affiliates	$ 226,510	$ 210,829
Total assets	3,106,517	3,779,323
LIABILITIES AND STOCKHOLDERS' EQUITY
Total liabilities	2,357,782	2,675,246
Equity attributable to stockholders of Advantage Solutions Inc.
Common stock value	32	32
Additional paid-incapital	3,466,221	3,449,261
Accumulated deficit	(2,641,612)	(2,314,650)
Loans to Karman Topco L.P.	(7,029)	(6,387)
Accumulated other comprehensive loss	(15,861)	(3,945)
Treasury stock, at cost; 12,400,075 and 3,600,075 shares as of December 31, 2024 and 2023, respectively	(53,016)	(18,949)
Total equity attributable to stockholders of Advantage Solutions Inc.	748,735	1,105,362
Equity attributable to noncontrolling interest	0	(1,285)
Total stockholders' equity	748,735	1,104,077	$ 1,225,724	$ 2,580,401
Total liabilities and stockholders' equity	3,106,517	3,779,323
Parent Company
Assets
Investments in unconsolidated affiliates	748,817	1,106,025
Total assets	748,817	1,106,025
LIABILITIES AND STOCKHOLDERS' EQUITY
Warrant liability	82	667
Total liabilities	82	667
Equity attributable to stockholders of Advantage Solutions Inc.
Common stock value	32	32
Additional paid-incapital	3,466,221	3,449,261
Accumulated deficit	(2,641,612)	(2,314,655)
Loans to Karman Topco L.P.	(7,029)	(6,387)
Accumulated other comprehensive loss	(15,861)	(3,944)
Treasury stock, at cost; 12,400,075 and 3,600,075 shares as of December 31, 2024 and 2023, respectively	(53,016)	(18,949)
Total equity attributable to stockholders of Advantage Solutions Inc.	748,735	1,105,358
Total liabilities and stockholders' equity	$ 748,817	$ 1,106,025