AUDITED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' DEFICIT - USD ($) $ in Thousands	Total	Common Class A & B	Stagwell Inc. Shareholders' Equity	Common Shares Common Class A & B	Common Shares Class C	Common Shares Common Class A and Common Class B	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interests	Members' capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Members' Equity											$ 358,756
Balance at Dec. 31, 2020	$ 398,543		$ 358,756							$ 39,787
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	21,036
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	15,296
Other Comprehensive Income (Loss), Net of Tax	5,278
Stockholders' Equity, Reclassification on Noncontrolling Interest to Liability [Abstract]	(8,475)									(8,475)
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]
Income attributable to noncontrolling interests	14,884
Net Income (Loss) Attributable to Parent	19,919
Net income			19,919					19,919
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	21,990									30,125
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	50,044
Other Comprehensive Income (Loss), Net of Tax	33,685		10,200						10,200	(23,485)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(16,359)		(9,719)					(19,919)	10,200	6,640
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(29,957)									(29,957)
Reduction of noncontrolling and redeemable noncontrolling interest	4,600		1,000				1,000			3,600
Noncontrolling Interest, Increase from Acquisitions	(2,667)									(2,667)
Stockholders Equity, Increase (Decrease) Form Change In Redemption Value Of Noncontrolling Interest, Value	(8,711)		(8,711)					(8,711)
Restricted Awards Granted or Vested (in shares)		3,940,000
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited				(221,000)
Stock Issued During Period, Value, Restricted Stock Award, Gross				$ (4)			(4)
Shares acquired and cancelled (in shares)				(9,725,000)
Stock Repurchased and Retired During Period, Value	(70,279)		(70,279)	$ (10)			(70,269)
Stock-based compensation	34,974		34,974				34,974
Stock Issued During Period, Value, Acquisitions	1,178		1,178				1,178
Stock Issued During Period, Shares, Acquisitions				175,000
Conversion of shares (in shares)				19,061,000	(19,061,000)
Stock Issued During Period, Value, Conversion of Units			(47,930)	$ (19)			(47,911)			47,930
Finalization of MDC acquisition accounting	13,993		16,294				16,294			(2,301)
Other, Shares				242,000
Other	14,756		(6,512)	$ (1)			(6,960)	447		8,244
Balance (in shares) at Dec. 31, 2022				131,724,000	160,909,000
Balance at Dec. 31, 2022	928,814		498,650	$ 132	$ 2		491,899	22,095	(15,478)	430,164
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Income attributable to noncontrolling interests	30,125
Finalization of Stagwell Inc’s tax basis in Stagwell Global, LLC	119,470		119,470				119,470
Net Income (Loss) Attributable to Parent	134
Net income			134					134
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	(42,142)									41,508
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	41,642
Other Comprehensive Income (Loss), Net of Tax	(8,334)		(2,411)						(2,411)	5,923
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(49,976)		(2,545)					(134)	(2,411)	47,431
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(19,164)									(19,164)
Reduction of noncontrolling and redeemable noncontrolling interest	(3,257)		(3,257)				(3,257)
Changes in redemption value	(442)
Stockholders Equity, Increase (Decrease) Form Change In Redemption Value Of Noncontrolling Interest, Value	442		442					442
Restricted Awards Granted or Vested (in shares)				5,548,000
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited				67,000
Stock Issued During Period, Value, Restricted Stock Award, Gross	$ (468)		(468)	$ (6)			462
Shares acquired and cancelled (in shares)	(9,900,000)			(35,527,000)
Stock Repurchased and Retired During Period, Value	$ (225,505)		(225,505)	$ (36)			(225,469)
Stock-based compensation	49,674		49,674				49,674
Change in ownership held by Class C holders	0		10,858				(10,858)			10,858
Stock Issued During Period, Value, Acquisitions	41,160		41,160	$ 8			41,152
Stock Issued During Period, Shares, Acquisitions				7,530,000
Conversion of shares (in shares)					(9,260,000)	9,260,000
Stock Issued During Period, Value, Conversion of Units						$ (9)	(9)
Other, Shares				1,000
Other	(2,966)		(2,254)	$ 1			(1,614)	(639)		(712)
Balance (in shares) at Dec. 31, 2023				118,469,000	151,649,000
Balance at Dec. 31, 2023	825,272		$ 356,695	$ 118	$ 2		$ 348,494	$ 21,148	$ (13,067)	$ 468,577
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Liability modification of certain SARS awards	1,600
Income attributable to noncontrolling interests	$ 41,508