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Noncontrolling and Redeemable Noncontrolling Interests - Noncontrolling Interests (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Noncontrolling Interest [Line Items]
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest		$ 5,721	$ 19,780	$ 42,142
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	$ (3,005)	7,246	3,005	(634)
Income attributable to noncontrolling interests		1,525	22,785	41,508
Nonredeemable Noncontrolling Interest		17,974	445,174
Stagwell Global
Noncontrolling Interest [Line Items]
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest		916	2,636	3,076
Income attributable to noncontrolling interests		(8,162)	5,641	2,442
Nonredeemable Noncontrolling Interest		17,974	21,746
Stagwell Media
Noncontrolling Interest [Line Items]
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest		(6,637)	17,144	39,066
Income attributable to noncontrolling interests		$ 6,637	17,144	$ 39,066
Nonredeemable Noncontrolling Interest			$ 423,428

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