UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue:
Revenues	$ 711,281	$ 617,573	$ 2,052,508	$ 1,872,282
Operating expenses:
Cost of services	457,018	384,980	1,340,456	1,201,309
Office and general expenses	176,440	160,021	507,916	481,379
Depreciation and amortization	36,044	38,830	112,881	107,795
Impairment and other losses	0	0	1,715	10,562
Costs and Expenses, Total	669,502	583,831	1,962,968	1,801,045
Operating Income (Loss), Total	41,779	33,742	89,540	71,237
Other income (expense):
Interest expense, net	(23,781)	(25,886)	(68,279)	(67,755)
Foreign exchange, net	1,312	(140)	(2,301)	(2,288)
Other, net	249	(271)	(825)	(467)
Nonoperating Income (Expense), Total	(22,220)	(26,297)	(71,405)	(70,510)
Income before income taxes and equity in earnings of non-consolidated affiliates	19,559	7,445	18,135	727
Income tax expense	5,691	4,324	9,441	4,997
Income (loss) before equity in earnings of non-consolidated affiliates	13,868	3,121	8,694	(4,270)
Equity in income (loss) of non-consolidated affiliates	(4)	(4)	503	(447)
Net income (loss)	13,864	3,117	9,197	(4,717)
Net (income) loss attributable to noncontrolling and redeemable noncontrolling interests	(10,593)	(2,464)	(10,173)	3,565
Net income (loss) attributable to Stagwell Inc. common shareholders	$ 3,271	$ 653	$ (976)	$ (1,152)
Earnings Per Share [Abstract]
Earnings per share, basic	$ 0.03	$ 0.01	$ (0.01)	$ (0.01)
Earnings per share, diluted	$ 0.03	$ 0	$ (0.01)	$ (0.01)
Weighted Average Number Of Shares Outstanding For Basic and Diluted [Abstract]
Weighted Average Number of Shares Outstanding, Basic	108,198	110,787	111,436	118,772
Weighted Average Number of Shares Outstanding, Diluted	112,190	265,006	111,436	274,864