AUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	$ 41,642	$ 50,044	$ 35,920
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Stock-based compensation	57,179	33,152	75,032
Depreciation and amortization	142,831	131,273	77,503
Operating Lease, Right-of-Use Asset, Amortization Expense	76,653	77,368	58,982
Impairment and other losses	11,395	122,179	16,240
Deferred income taxes	19,443	(18,241)	(3,818)
Adjustment To Deferred Acquisition Consideration	13,060	(13,405)	18,721
Gain (loss) on disposition of business	(94,505)		(43,440)
Other, net	8,313	(22)	568
Changes in working capital:
Accounts receivable	(58,704)	37,780	(30,784)
Expenditures billable to clients	(21,477)	(32,366)	(35,371)
Other assets	1,153	(1,388)	3,997
Accounts payable	52,837	108,028	(51,978)
Accrued expenses and other liabilities	(24,647)	(22,436)	61,974
Advance billings	(41,137)	(27,062)	76,021
Increase (Decrease) in Operating Lease Liability	(87,629)	(86,525)	(53,360)
Deferred acquisition related payments	(15,400)	(10,793)	(5,351)
Net Cash Provided by (Used in) Operating Activities, Total	81,007	347,586	200,856
Cash flows from investing activities:
Capital expenditures	(14,238)	(22,663)	(8,797)
Acquisitions, net of cash acquired	(23,339)	(74,234)	150,346
Capitalized software	(28,175)	(12,774)	(13,829)
Capitalized software	229,484		37,232
Other	(7,781)	(6,604)	(1,000)
Net Cash Provided by (Used in) Investing Activities, Total	155,951	(116,275)	163,952
Cash flows from financing activities:
Repayment of borrowings under revolving credit facility	1,945,500	(1,266,000)	(719,088)
Proceeds from borrowings under revolving credit facility	(1,986,500)	1,255,500	516,669
Shares repurchased and cancelled	(223,835)	(70,269)	(841)
Distributions to noncontrolling interests	(24,964)	(39,197)
Payment of deferred consideration	(49,221)	(63,170)
Purchase of noncontrolling interest		(3,600)	(37,500)
Proceeds from issuance of the 5.625% Notes			1,100,000
Debt issuance costs	(844)		(15,053)
Distributions			(233,203)
Payments for Repurchase of Senior Notes			(884,398)
Net Cash Provided by (Used in) Financing Activities, Total	(339,864)	(186,736)	(273,414)
Effect of exchange rate changes on cash and cash equivalents	2,054	(7,995)	158
Net increase (decrease) in cash and cash equivalents	(100,852)	36,580	91,552
Cash and cash equivalents at beginning of period	220,589	184,009	92,457
Cash and cash equivalents at end of period	119,737	220,589	184,009
Supplemental Cash Flow Information:
Cash income taxes paid	45,538	41,235	58,578
Cash interest paid	87,068	70,935	23,528
Non-cash investing and financing activities:
Establishment of Tax Receivables Agreement liability		26,610
Conversion of Class C to Class A Shares		47,930
Finalization of Stagwell Inc’s tax basis in Stagwell Global, LLC		119,470
Noncash Contributions from Limited Liability Company (LLC)			12,372
Noncash Distributions to Limited Liability Company (LLC)			13,000
Non-cash payment of deferred acquisition consideration	32,820	989	7,080
Conversion of Stock, Amount Converted			209,947
Acquisitions of business	8,332	1,178	425,752
Noncash or Part Noncash Acquisition, Noncontrolling Interest Acquired	$ 22,172	1,000	170,266
Issuance of Redeemable Noncontrolling Interest			$ 27,820
Establishment of a deferred tax asset related to the exchange		$ 30,556