AUDITED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue:
Revenues	$ 2,841,216	$ 2,527,177	$ 2,687,792
Operating expenses:
Cost of services	1,842,978	1,621,174	1,673,576
Office and general expenses	711,803	661,250	601,536
Depreciation and amortization	151,652	142,831	131,273
Impairment and other losses	1,715	11,395	122,179
Costs and Expenses, Total	2,708,148	2,436,650	2,528,564
Operating Income (Loss), Total	133,068	90,527	159,228
Other income (expense):
Interest expense, net	(92,317)	(90,644)	(76,062)
Foreign exchange, net	(1,656)	(2,960)	(2,606)
Gain (loss) on disposition of business	0	94,505	0
Other, net	(1,372)	(359)	(4,975)
Nonoperating Income (Expense), Total	(95,345)	542	(83,643)
Income before income taxes and equity in earnings of non-consolidated affiliates	37,723	91,069	75,585
Income tax expense	13,182	40,557	25,462
Income before equity in earnings of non-consolidated affiliates	24,541	50,512	50,123
Equity in income (loss) of non-consolidated affiliates	503	(8,870)	(79)
Net income	25,044	41,642	50,044
Net income attributable to noncontrolling and redeemable noncontrolling interests	(22,785)	(41,508)	(30,125)
Net income attributable to Stagwell Inc. common shareholders	$ 2,259	$ 134	$ 19,919
Earnings Per Share [Abstract]
Earnings per share, basic	$ 0.02	$ 0	$ 0.16
Earnings per share, diluted	$ 0.02	$ 0	$ 0.12
Weighted Average Number Of Shares Outstanding For Basic and Diluted [Abstract]
Weighted Average Number of Shares Outstanding, Basic	110,890	117,259	124,262
Weighted Average Number of Shares Outstanding, Diluted	115,752	122,170	296,596