Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Numerator
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	$ (5,325)	$ (713)
Net Income (Loss) Attributable to Noncontrolling Interest	2,408	(569)
Net Income (Loss) Attributable to Parent	$ (2,917)	$ (1,282)
Denominator
Basic weighted average number of common shares outstanding (in shares)	112,088	112,633
Diluted weighted average number of common shares outstanding (in shares)	263,737	116,405
Class of Stock [Line Items]
Basic (in dollars per share)	$ (0.03)	$ (0.01)
Diluted (in dollars per share)	$ 0.04	$ 0.01
Antidilutive securities excluded from computation of earnings per share (shares)	4,800	4,600
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	$ (5,325)	$ (713)
Income attributable to noncontrolling interests	(2,408)	569
Net income available to stockholders, diluted	(9,554)	(1,506)
Net Income (Loss) Attributable to Parent	$ (2,917)	(1,282)
Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities		$ (224)
Weighted Average Number of Shares Outstanding, Basic	112,088	112,633
Diluted weighted average number of common shares outstanding (in shares)	263,737	116,405
Stagwell Media
Numerator
Net Income (Loss) Attributable to Noncontrolling Interest	$ (6,637)	$ (1,047)
Class of Stock [Line Items]
Income attributable to noncontrolling interests	6,637	1,047
Stagwell Global
Numerator
Net Income (Loss) Attributable to Noncontrolling Interest	4,229	1,616
Class of Stock [Line Items]
Income attributable to noncontrolling interests	$ (4,229)	$ (1,616)
Common Class C
Class of Stock [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares)		151,649
Weighted average number diluted shares outstanding adjustment	151,649
Stock Appreciation Rights (SARs)
Class of Stock [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares)		4,531
Weighted average number diluted shares outstanding adjustment		3,772
Employee Stock
Class of Stock [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares)	58	49
Class A Shares to settle Deferred Acquisition Obligations
Class of Stock [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares)	7,125
Stock Appreciation Rights and Restricted Awards
Class of Stock [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares)	6,472