CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Treasury Stock	Additional Paid-in Capital	Accumulated Deficit	Loans to Parent	Accumulated Other Comprehensive Income (Loss)	Advantage Solutions Inc. Stockholders' Equity	Nonredeemable noncontrolling Interests
Beginning Balance at Dec. 31, 2021	$ 2,580,401	$ 32	$ (12,567)	$ 3,373,278	$ (866,607)	$ (6,340)	$ (4,479)	$ 2,483,317	$ 97,084
Beginning Balance, Shares at Dec. 31, 2021		316,963,552	1,610,014
Net (loss) income	(1,377,302)
Net Income (Loss)	(1,380,513)				(1,380,502)			(1,380,502)	2,995
Net (loss) income	(1,377,507)
Foreign currency translation adjustments	(18,896)						(14,370)	(14,370)	(4,526)
Total comprehensive (loss) income	(1,396,403)							(1,394,872)	(1,531)
Interest on loans to Karman Topco L.P.	(23)					(23)		(23)
Increase in noncontrolling interest	6,191								6,191
Equity-based compensation of Karman Topco L.P.	(6,934)			(6,934)				(6,934)
Shares issued under 2020 Employee Stock Purchase Plan	3,320			3,320				3,320
Shares issued under 2020 Incentive Award Plan and tax related to net share settlement, Shares		2,013,535
Shares issued under 2020 Employee Stock Purchase Plan, Shares		713,213
Stock-based compensation expense	39,172			39,172				39,172
Ending Balance at Dec. 31, 2022	1,225,724	$ 32	$ (12,567)	3,408,836	(2,247,109)	(6,363)	(18,849)	1,123,980	101,744
Ending Balance, Shares at Dec. 31, 2022		319,690,300	1,610,014
Net (loss) income	(60,382)
Net Income (Loss)	(63,322)				(63,258)			(63,258)	2,639
Net (loss) income	(60,619)
Foreign currency translation adjustments	9,018						5,817	5,817	3,201
Total comprehensive (loss) income	(51,601)							(57,441)	5,840
Interest on loans to Karman Topco L.P.	(24)					(24)		(24)
Equity-based compensation of Karman Topco L.P.	(2,524)			(2,524)				(2,524)
Purchase of treasury stock	(10,665)		$ (10,665)					(10,665)
Purchase of treasury stock, shares		(4,164,010)	4,164,010
Retirement of shares, Shares			(2,173,949)
Retirement of shares			$ 4,283		(4,283)
Shares issued under 2020 Employee Stock Purchase Plan	2,248			2,248				2,248
Shares issued under 2020 Incentive Award Plan and tax related to net share settlement	(1,880)			(1,880)				(1,880)
Shares issued under 2020 Incentive Award Plan and tax related to net share settlement, Shares		5,467,531
Shares issued under 2020 Employee Stock Purchase Plan, Shares		1,241,440
Stock-based compensation expense	42,581			42,581				42,581
Deconsolidation of subsidiaries	(99,782)						9,087	9,087	(108,869)
Ending Balance at Dec. 31, 2023	1,104,077	$ 32	$ (18,949)	3,449,261	(2,314,650)	(6,387)	(3,945)	1,105,362	(1,285)
Ending Balance, Shares at Dec. 31, 2023		322,235,261	3,600,075
Net (loss) income	(324,770)
Net Income (Loss)	(326,962)				(326,962)			(326,962)	2,192
Net (loss) income	(324,770)
Foreign currency translation adjustments	(9,412)						(9,485)	(9,485)	73
Total comprehensive (loss) income	(334,182)							(336,447)	2,265
Interest on loans to Karman Topco L.P.	(642)					(642)		(642)
Equity-based compensation of Karman Topco L.P.	723			723				723
Purchase of treasury stock	(34,067)		$ (34,067)					(34,067)
Purchase of treasury stock, shares		(8,800,000)	8,800,000
Shares issued under 2020 Employee Stock Purchase Plan	2,294			2,294				2,294
Shares issued under 2020 Incentive Award Plan and tax related to net share settlement	(12,765)			(12,765)				(12,765)
Shares issued under 2020 Incentive Award Plan and tax related to net share settlement, Shares		6,354,027
Shares issued under 2020 Employee Stock Purchase Plan, Shares		983,808
Stock-based compensation expense	26,708			26,708				26,708
Sale of a business	(3,411)						(2,431)	(2,431)	(980)
Deconsolidation of subsidiaries	(108,900)
Ending Balance at Dec. 31, 2024	$ 748,735	$ 32	$ (53,016)	$ 3,466,221	$ (2,641,612)	$ (7,029)	$ (15,861)	$ 748,735	$ 0
Ending Balance, Shares at Dec. 31, 2024		320,773,096	12,400,075