CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Revenue:
Revenues	$ 704,143	$ 651,740
Operating expenses:
Cost of services	459,531	412,087
Office and general expenses	190,639	179,362
Depreciation and amortization	44,331	42,006
Costs and Expenses, Total	694,501	633,455
Operating Income (Loss), Total	9,642	18,285
Other income (expense):
Interest expense, net	(23,266)	(23,356)
Foreign exchange, net	(3,021)	1,220
Other, net	(69)	249
Nonoperating Income (Expense), Total	(26,356)	(21,887)
Loss before income taxes and equity in earnings of non-consolidated affiliates	(16,714)	(3,602)
Income tax (benefit) expense	(2,888)	1,722
Loss before equity in earnings of non-consolidated affiliates	(13,826)	(5,324)
Equity in loss of non-consolidated affiliates	(121)	(1)
Net loss	(13,947)	(5,325)
Net loss attributable to noncontrolling and redeemable noncontrolling interests	974	2,408
Net loss attributable to Stagwell Inc. common shareholders	$ (12,973)	$ (2,917)
Earnings Per Share [Abstract]
Earnings per share, basic	$ (0.05)	$ (0.03)
Earnings per share, diluted	$ (0.05)	$ (0.04)
Weighted Average Number Of Shares Outstanding For Basic and Diluted [Abstract]
Weighted Average Number of Shares Outstanding, Basic	250,766	112,088
Weighted Average Number of Shares Outstanding, Diluted	250,766	263,737