CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Comprehensive income (loss)
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	$ 30,626	$ 25,044	$ 41,642
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive income (loss) - Foreign currency translation adjustment	38,055	(27,699)	7,996
Comprehensive income (loss) for the period	66,875	(1,231)	49,976
Comprehensive income attributable to the noncontrolling and redeemable noncontrolling interests	(7,552)	(7,216)	(47,431)
Comprehensive income (loss) attributable to Stagwell Inc. common shareholders	59,323	(8,447)	2,545
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	$ (1,806)	$ 1,424	$ 338