UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current Assets
Cash and cash equivalents	$ 135,153	$ 184,009
Accounts receivable, net	767,147	696,937
Expenditures billable to clients	51,069	63,065
Other current assets	69,009	61,830
Total Current Assets	1,022,378	1,005,841
Fixed assets, net	118,542	118,603
Right-of-use lease assets - operating leases	311,028	311,654
Goodwill	1,651,475	1,652,723
Other intangible assets, net	914,829	937,695
Other assets	33,581	29,064
Total Assets	4,051,833	4,055,580
Current Liabilities
Accounts payable	248,619	271,769
Accrued media	284,735	237,794
Accruals and other liabilities	224,945	272,533
Advance billings	344,125	361,885
Current portion of lease liabilities - operating leases	70,356	72,255
Current portion of deferred acquisition consideration	75,619	77,946
Total Current Liabilities	1,248,399	1,294,182
Long-term debt	1,222,041	1,191,601
Long-term portion of deferred acquisition consideration	148,649	144,423
Long-term lease liabilities - operating leases	339,168	342,730
Deferred tax liabilities, net	78,401	103,093
Other liabilities	73,097	57,147
Total Liabilities	3,109,755	3,133,176
Redeemable Noncontrolling Interests	44,233	43,364
Commitments and Contingencies
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Paid-in capital	373,300	382,893
Retained earnings	6,668	(6,982)
Accumulated other comprehensive loss	(10,625)	(5,278)
Stagwell Inc. Shareholders' Equity	369,480	370,753
Noncontrolling interests	528,365	508,287
Total Shareholders' Equity	897,845	879,040
Liabilities and Equity, Total	4,051,833	4,055,580
Common Class A and Common Class B
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Common shares	135	118
Common Class C
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Common shares	$ 2	$ 2