Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Numerator
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	$ (5,017)	$ 33,622
Net Income (Loss) Attributable to Noncontrolling Interest	5,460	(20,947)
Net Income (Loss) Attributable to Parent	443	12,675
Net income available to stockholders, diluted	$ (2,722)	$ 30,396
Denominator
Basic weighted average number of common shares outstanding (in shares)	125,199	122,285
Diluted weighted average number of common shares outstanding (in shares)	289,806	297,484
Class of Stock [Line Items]
Basic (in dollars per share)	$ 0	$ 0.1
Diluted (in dollars per share)	$ (0.01)	$ 0.1
Antidilutive securities excluded from computation of earnings per share (shares)	700	1,000
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	$ (5,017)	$ 33,622
Income attributable to noncontrolling interests	(5,460)	20,947
Net Income (Loss) Attributable to Parent	$ 443	$ 12,675
Weighted Average Number of Shares Outstanding, Basic	125,199	122,285
Net income available to stockholders, diluted	$ (2,722)	$ 30,396
Diluted weighted average number of common shares outstanding (in shares)	289,806	297,484
Stagwell Media
Numerator
Net Income (Loss) Attributable to Noncontrolling Interest	$ 3,165	$ (17,721)
Class of Stock [Line Items]
Income attributable to noncontrolling interests	(3,165)	17,721
Stagwell Global
Numerator
Net Income (Loss) Attributable to Noncontrolling Interest	2,295	(3,226)
Class of Stock [Line Items]
Income attributable to noncontrolling interests	$ (2,295)	$ 3,226
Common Class C
Class of Stock [Line Items]
Weighted average number diluted shares outstanding adjustment	160,909	170,372
Stock Appreciation Rights (SARs)
Class of Stock [Line Items]
Weighted average number diluted shares outstanding adjustment	1,929	2,041
Restricted Stock Units (RSUs)
Class of Stock [Line Items]
Weighted average number diluted shares outstanding adjustment	1,769	2,786
Common Class A
Class of Stock [Line Items]
Weighted average number diluted shares outstanding adjustment	128,897	127,112