UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' DEFICIT - USD ($) $ in Thousands	Total	Members' capital	Stagwell Inc. Shareholders' Equity	Common Shares	Common Shares Common Class A & B	Common Shares Class C	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Beginning balance at Dec. 31, 2020		$ 358,756
Balance (in shares) at Dec. 31, 2020					0	0
Balance at Dec. 31, 2020	$ 398,543		$ 358,756		$ 0	$ 0	$ 0	$ 0	$ 0	$ 39,787
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to Stagwell Inc.	5,518	4,365	4,365							1,153
Other comprehensive income (loss)	137	137	137						0
Contributions	10,268	10,268	10,268				0
Distributions	(28,004)	(28,004)	(28,004)					0
Distributions to noncontrolling interests	(10,890)									(10,890)
Changes in redemption value of RNCI	(400)	(400)	(400)					0
Ending balance at Mar. 31, 2021		$ 345,122
Balance (in shares) at Mar. 31, 2021				0		0
Balance at Mar. 31, 2021	375,172		345,122		$ 0	$ 0	0	0	0	30,050
Balance (in shares) at Dec. 31, 2021					118,252,000	179,970,000
Balance at Dec. 31, 2021	879,040		370,753		$ 118	$ 2	382,893	(6,982)	(5,278)	508,287
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to Stagwell Inc.	31,212		12,675					12,675		18,537
Other comprehensive income (loss)	(5,347)		(5,347)						(5,347)
Distributions to noncontrolling interests	(705)									(705)
Changes in redemption value of RNCI	975		975					975
Granting of restricted awards	0		0		$ 2		(2)
Granting of restricted awards (in shares)					1,787,000
Shares acquired and cancelled	(14,926)		(14,926)				(14,926)
Shares acquired and cancelled (in shares)					(1,998,000)
Stock-based compensation	6,714		6,714				6,714
Conversion of shares	0		0		$ 15		(15)
Conversion of shares (in shares)					15,155,000	(15,155,000)
Other	882		(1,364)				(1,364)			2,246
Balance (in shares) at Mar. 31, 2022					133,196,000	164,815,000
Balance at Mar. 31, 2022	$ 897,845		$ 369,480		$ 135	$ 2	$ 373,300	$ 6,668	$ (10,625)	$ 528,365