UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating expenses:
Cost of services	$ 424,661	$ 122,074	$ 836,631	$ 234,073
Office and general expenses	165,423	52,674	309,935	104,952
Depreciation and amortization	32,231	10,381	63,435	21,331
Impairment and other losses	2,266	0	2,823	0
Costs and Expenses, Total	624,581	185,129	1,212,824	360,356
Operating Income (Loss), Total	48,332	24,431	102,992	30,446
Other income (expense):
Interest expense, net	(18,151)	(1,935)	(36,880)	(3,286)
Foreign exchange, net	70	(385)	(236)	(1,062)
Other, net	(121)	(101)	35	1,184
Nonoperating Income (Expense), Total	(18,202)	(2,421)	(37,081)	(3,164)
Income before income taxes and equity in earnings of non-consolidated affiliates	30,130	22,010	65,911	27,282
Income tax expense	5,421	3,348	8,610	4,021
Income before equity in earnings of non-consolidated affiliates	24,709	18,662	57,301	23,261
Equity in income (loss) of non-consolidated affiliates	(190)	(3)	840	1
Net income	24,519	18,659	58,141	23,262
Net income attributable to noncontrolling and redeemable noncontrolling interests	(14,056)	(1,314)	(35,003)	(1,552)
Net income attributable to Stagwell Inc. common shareholders	$ 10,463	17,345	$ 23,138	21,710
Earnings Per Share [Abstract]
Earnings per share, basic	$ 0.08		$ 0.19
Earnings per share, diluted	$ 0.08		$ 0.18
Weighted Average Number Of Shares Outstanding For Basic and Diluted [Abstract]
Weighted Average Number of Shares Outstanding, Basic	126,425		124,367
Weighted Average Number of Shares Outstanding, Diluted	296,414		298,843
Revenues	$ 672,913	$ 209,560	$ 1,315,816	$ 390,802