UNAUDITED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Current Assets
Cash and cash equivalents	$ 145,807	$ 119,737
Accounts receivable, net	716,394	697,178
Expenditures billable to clients	137,443	114,097
Other current assets	108,187	94,054
Total Current Assets	1,107,831	1,025,066
Fixed assets, net	77,766	77,825
Operating Lease, Right-of-Use Asset	223,194	254,278
Goodwill	1,521,005	1,498,815
Other intangible assets, net	769,596	818,220
Other assets	97,425	92,843
Total Assets	3,796,817	3,767,047
Current Liabilities
Accounts payable	338,649	414,980
Accrued media	206,512	291,777
Accruals and other liabilities	210,146	233,046
Advance billings	338,789	301,674
Current portion of lease liabilities - operating leases	61,897	65,899
Current portion of deferred acquisition consideration	8,618	66,953
Total Current Liabilities	1,164,611	1,374,329
Long-term debt	1,463,925	1,145,828
Long-term portion of deferred acquisition consideration	53,055	34,105
Long-term lease liabilities - operating leases	250,388	281,307
Deferred tax liabilities, net	41,728	40,509
Other liabilities	60,220	54,905
Total Liabilities	3,033,927	2,930,983
Redeemable Noncontrolling Interests	18,618	10,792
Commitments and Contingencies
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Paid-in capital	287,941	348,494
Retained earnings	11,416	21,148
Accumulated other comprehensive loss	(13,057)	(13,067)
Stagwell Inc. Shareholders’ Equity	286,412	356,695
Noncontrolling interests	457,860	468,577
Total Shareholders’ Equity	744,272	825,272
Liabilities and Equity, Total	3,796,817	3,767,047
Common Class A and Common Class B
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Common shares	110	118
Common Class C
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Common shares	$ 2	$ 2