UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenue:
Revenues	$ 651,740	$ 670,059
Operating expenses:
Cost of services	412,087	444,526
Office and general expenses	179,362	163,343
Depreciation and amortization	42,006	34,836
Impairment and other losses	0	1,500
Costs and Expenses, Total	633,455	644,205
Operating Income (Loss), Total	18,285	25,854
Other income (expense):
Interest expense, net	(23,356)	(20,965)
Foreign exchange, net	1,220	(2,258)
Other, net	249	(1,267)
Nonoperating Income (Expense), Total	(21,887)	(24,490)
Income (loss) before income taxes and equity in earnings of non-consolidated affiliates	(3,602)	1,364
Income tax expense	1,722	2,585
Loss before equity in earnings of non-consolidated affiliates	(5,324)	(1,221)
Equity in income (loss) of non-consolidated affiliates	(1)	508
Net loss	(5,325)	(713)
Net (income) loss attributable to noncontrolling and redeemable noncontrolling interests	2,408	(569)
Net loss attributable to Stagwell Inc. common shareholders	$ (2,917)	$ (1,282)
Earnings Per Share [Abstract]
Earnings per share, basic	$ (0.03)	$ (0.01)
Earnings per share, diluted	$ (0.04)	$ (0.01)
Weighted Average Number Of Shares Outstanding For Basic and Diluted [Abstract]
Weighted Average Number of Shares Outstanding, Basic	112,088	112,633
Weighted Average Number of Shares Outstanding, Diluted	263,737	116,405