Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Numerator
Net income	$ 65,842	$ 35,920	$ 71,461
Net loss attributable to Stagwell Inc. common shareholders		(3,706)
Net Income (Loss) Attributable to Noncontrolling Interest	(38,573)	(14,884)	(15,105)
Net Income (Loss) Attributable to Parent	27,269	21,036	$ 56,356
Net income available to stockholders, diluted	$ 51,721	$ (3,706)
Denominator
Basic weighted average number of common shares outstanding (in shares)	124,262	90,426
Diluted weighted average number of common shares outstanding (in shares)	296,596	90,426
Class of Stock [Line Items]
Basic (in dollars per share)	$ 0.22	$ (0.04)
Diluted (in dollars per share)	$ 0.17	$ (0.04)
Antidilutive securities excluded from computation of earnings per share (shares)	2,292
Stagwell Media
Numerator
Net Income (Loss) Attributable to Noncontrolling Interest	$ (24,452)
Stagwell Global
Numerator
Net Income (Loss) Attributable to Noncontrolling Interest	$ (14,121)
Common Class C
Class of Stock [Line Items]
Weighted average number diluted shares outstanding adjustment	165,971
Antidilutive securities excluded from computation of earnings per share (shares)		179,970
Stock Appreciation Rights and Restricted Awards
Class of Stock [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares)		9,509
Stock Appreciation Rights (SARs)
Class of Stock [Line Items]
Weighted average number diluted shares outstanding adjustment	1,896
Restricted Stock Units (RSUs)
Class of Stock [Line Items]
Weighted average number diluted shares outstanding adjustment	4,467