UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current Assets
Cash and cash equivalents	$ 98,705	$ 220,589
Accounts receivable, net	670,090	645,846
Expenditures billable to clients	128,903	93,077
Other current assets	104,082	71,443
Total Current Assets	1,001,780	1,030,955
Fixed assets, net	81,373	98,878
Operating Lease, Right-of-Use Asset	245,187	273,567
Goodwill	1,572,489	1,566,956
Other intangible assets, net	844,004	907,529
Other assets	125,376	115,447
Total Assets	3,870,209	3,993,332
Current Liabilities
Accounts payable	306,956	357,253
Accrued media	183,510	240,506
Accruals and other liabilities	205,861	248,477
Advance billings	335,600	337,034
Current portion of lease liabilities - operating leases	67,976	76,349
Current portion of deferred acquisition consideration	104,294	90,183
Total Current Liabilities	1,204,197	1,349,802
Long-term debt	1,498,129	1,184,707
Long-term portion of deferred acquisition consideration	29,443	71,140
Long-term lease liabilities - operating leases	271,285	294,049
Deferred tax liabilities, net	47,717	40,109
Other liabilities	55,099	69,780
Total Liabilities	3,105,870	3,009,587
Redeemable Noncontrolling Interests	10,085	39,111
Commitments and Contingencies
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Paid-in capital	324,926	491,899
Retained earnings	24,586	29,445
Accumulated other comprehensive loss	(18,813)	(38,941)
Stagwell Inc. Shareholders' Equity	330,817	482,537
Noncontrolling interests	423,437	462,097
Total Shareholders' Equity	754,254	944,634
Liabilities and Equity, Total	3,870,209	3,993,332
Common Class A and Common Class B
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Common shares	116	132
Common Class C
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Common shares	$ 2	$ 2