Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Numerator
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	$ 13,864	$ 3,117	$ 9,197	$ (4,717)
Net Income (Loss) Attributable to Noncontrolling Interest	(10,593)	(2,464)	(10,173)	3,565
Net Income (Loss) Attributable to Parent	$ 3,271	$ 653	$ (976)	$ (1,152)
Denominator
Basic weighted average number of common shares outstanding (in shares)	108,198,000	110,787,000	111,436,000	118,772,000
Diluted weighted average number of common shares outstanding (in shares)	112,190,000	265,006,000	111,436,000	274,864,000
Class of Stock [Line Items]
Basic (in dollars per share)	$ 0.03	$ 0.01	$ (0.01)	$ (0.01)
Diluted (in dollars per share)	$ (0.03)	$ 0	$ 0.01	$ 0.01
Antidilutive securities excluded from computation of earnings per share (shares)			4,600,000	3,700,000
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	$ 13,864	$ 3,117	$ 9,197	$ (4,717)
Income attributable to noncontrolling interests	10,593	2,464	10,173	(3,565)
Net income available to stockholders, diluted		686		(3,854)
Net Income (Loss) Attributable to Parent	$ 3,271	$ 653	$ (976)	$ (1,152)
Weighted Average Number of Shares Outstanding, Basic	108,198,000	110,787,000	111,436,000	118,772,000
Diluted weighted average number of common shares outstanding (in shares)	112,190,000	265,006,000	111,436,000	274,864,000
Stagwell Media
Numerator
Net Income (Loss) Attributable to Noncontrolling Interest	$ 9,432	$ (33)	$ 5,850	$ 2,702
Class of Stock [Line Items]
Income attributable to noncontrolling interests	(9,432)	33	(5,850)	(2,702)
Stagwell Global
Numerator
Net Income (Loss) Attributable to Noncontrolling Interest	1,161	(2,431)	4,323	863
Class of Stock [Line Items]
Income attributable to noncontrolling interests	$ (1,161)	$ 2,431	$ (4,323)	$ (863)
Common Class C
Class of Stock [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares)	151,649,000		151,649,000
Weighted average number diluted shares outstanding adjustment		151,649,000		156,092,000
Stock Appreciation Rights (SARs)
Class of Stock [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares)			4,205,000
Weighted average number diluted shares outstanding adjustment		407,000
Employee Stock
Class of Stock [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares)			45,000	72,000
Weighted average number diluted shares outstanding adjustment	2,000	24,000
Stock Appreciation Rights and Restricted Awards
Class of Stock [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares)	3,346,000		3,515,000	5,532,000
Restricted Stock Units (RSUs)
Class of Stock [Line Items]
Weighted average number diluted shares outstanding adjustment	3,990,000	2,139,000
Common Class A
Class of Stock [Line Items]
Weighted average number diluted shares outstanding adjustment		113,357,000
Class A Shares to settle Deferred Acquisition Obligations
Class of Stock [Line Items]
Antidilutive securities excluded from computation of earnings per share (shares)		7,480,000		6,843,000