AUDITED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' DEFICIT - USD ($) $ in Thousands	Total	Parent [Member]	Common Shares Common Class A & B	Common Shares Class C	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]
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		19,919				19,919
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	50,044
Income attributable to noncontrolling interests	30,125							30,125
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)
Changes in redemption value of RNCI, net of tax	8,711	8,711				8,711
Restricted Awards Granted or Vested (in shares)			3,940,000
Stock Issued During Period, Value, Restricted Stock Award, Gross	0	0	$ (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 Issued During Period, Shares, Restricted Stock Award, Forfeited			(221,000)
Stock-based compensation	34,974	34,974			34,974
Stock Issued During Period, Shares, Acquisitions			175,000
Stock Issued During Period, Value, Acquisitions	1,178	1,178	$ 0		1,178
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 Stagwell Inc’s tax basis in Stagwell Global, LLC	119,470	119,470			119,470
Finalization of MDC acquisition accounting	(13,993)	(16,294)			(16,294)			(2,301)
Other, Shares			242,000
Stockholders' Equity, 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]
Net income		134				134
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	41,642
Income attributable to noncontrolling interests	41,508							41,508
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 of RNCI, net of tax	(442)	(442)				(442)
Restricted Awards Granted or Vested (in shares)			5,548,000
Stock Issued During Period, Value, Restricted Stock Award, Gross	(468)	(468)	$ (6)		(462)
Shares acquired and cancelled (in shares)			(35,527,000)
Stock Repurchased and Retired During Period, Value	(225,505)	(225,505)	$ (36)		(225,469)
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited			(67,000)
Stock-based compensation	49,674	49,674			49,674
Stock Issued During Period, Shares, Acquisitions			7,530,000
Stock Issued During Period, Value, Acquisitions	41,160	41,160	$ 8		41,152
Change in ownership held by Class C holders	0	(10,858)			(10,858)			10,858
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
Stockholders' Equity, 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
Net income		2,259				2,259
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	25,044
Income attributable to noncontrolling interests	22,785							22,785
Other Comprehensive Income (Loss), Net of Tax	(26,275)	(10,706)					(10,706)	(15,569)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(1,231)	(8,447)				2,259	(10,706)	(7,216)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(23,843)							(23,843)
Reduction of noncontrolling and redeemable noncontrolling interest	(13,295)	(3,069)			(3,069)			(10,226)
Noncontrolling Interest, Increase from Business Combination	2,667							2,667
Changes in redemption value of RNCI, net of tax	(11,669)	(11,669)				(11,669)
Restricted Awards Granted or Vested (in shares)			3,856,000
Stock Issued During Period, Value, Restricted Stock Award, Gross	(1,113)	(1,113)	$ (4)		(1,109)
Shares acquired and cancelled (in shares)			(17,002,000)
Stock Repurchased and Retired During Period, Value	(108,249)	(108,249)	$ (17)		(108,232)
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited			(96,000)
Stock-based compensation	45,509	45,509			45,509
Stock Issued During Period, Shares, Acquisitions			9,567,000
Stock Issued During Period, Value, Acquisitions	65,293	65,293	$ 10		65,283
Change in ownership held by Class C holders	$ (494)	(5,886)			(5,886)			6,380
Other, Shares	53,000
Stockholders' Equity, Other	$ (2,489)	441			(439)	(2)		(2,930)
Balance (in shares) at Dec. 31, 2024			114,847,000	151,649,000
Balance at Dec. 31, 2024	776,905	$ 331,731	$ 115	$ 2	$ 343,647	$ 11,740	$ (23,773)	$ 445,174
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Distributions to Class C Shareholders Noncontrolling Interest Holders	$ 21,600