CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue:
Revenues	$ 2,687,792	$ 1,469,363	$ 888,032
Operating expenses:
Cost of services	1,673,576	906,856	571,588
Office and general expenses	601,536	424,038	191,679
Depreciation and amortization	131,273	77,503	41,025
Impairment and other losses	122,179	16,240	0
Costs and Expenses, Total	2,528,564	1,424,637	804,292
Operating Income (Loss), Total	159,228	44,726	83,740
Other income (expense):
Interest expense, net	(76,062)	(31,894)	(6,223)
Foreign exchange, net	(2,606)	(3,332)	(721)
Other, net	(7,059)	50,058	544
Nonoperating Income (Expense), Total	(85,727)	14,832	(6,400)
Income before income taxes and equity in earnings of non-consolidated affiliates	73,501	59,558	77,340
Income tax expense	7,580	23,398	5,937
Income before equity in earnings of non-consolidated affiliates	65,921	36,160	71,403
Equity in income (loss) of non-consolidated affiliates	(79)	(240)	58
Net income	65,842	35,920	71,461
Net income attributable to noncontrolling and redeemable noncontrolling interests	(38,573)	(14,884)	(15,105)
Net income attributable to Stagwell Inc. common shareholders	$ 27,269	$ 21,036	$ 56,356
Earnings Per Share [Abstract]
Earnings per share, basic	$ 0.22	$ (0.04)
Earnings per share, diluted	$ 0.17	$ (0.04)
Weighted Average Number Of Shares Outstanding For Basic and Diluted [Abstract]
Weighted Average Number of Shares Outstanding, Basic	124,262	90,426
Weighted Average Number of Shares Outstanding, Diluted	296,596	90,426