AUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	$ 25,044	$ 41,642	$ 50,044
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Stock-based compensation	52,161	57,179	33,152
Depreciation and amortization	151,652	142,831	131,273
Operating Lease, Right-of-Use Asset, Amortization Expense	75,117	76,653	77,368
Impairment and other losses	1,715	11,395	122,179
Deferred income taxes	(10,686)	19,443	(18,241)
Adjustment To Deferred Acquisition Consideration	23,005	13,060	(13,405)
Gain (loss) on disposition of business	0	(94,505)	0
Other, net	7,622	8,313	(22)
Changes in working capital:
Accounts receivable	8,465	(58,704)	37,780
Expenditures billable to clients	(54,350)	(21,477)	(32,366)
Other assets	(6,200)	1,153	(1,388)
Accounts payable	24,438	52,837	108,028
Accrued expenses and other liabilities	(28,658)	(24,647)	(22,436)
Advance billings	(22,651)	(41,137)	(27,062)
Increase (Decrease) in Operating Lease Liability	(83,905)	(87,629)	(86,525)
Deferred acquisition related payments	(19,910)	(15,400)	(10,793)
Net Cash Provided by (Used in) Operating Activities, Total	142,859	81,007	347,586
Cash flows from investing activities:
Capital expenditures	(18,912)	(14,238)	(22,663)
Acquisitions, net of cash acquired	(103,254)	(23,339)	(74,234)
Capitalized software	(35,094)	(28,175)	(12,774)
Proceeds from sale of business, net	0	229,484	0
Other	(5,212)	(7,781)	(6,604)
Net Cash Provided by (Used in) Investing Activities, Total	(162,472)	155,951	(116,275)
Cash flows from financing activities:
Repayment of borrowings under revolving credit facility	(1,755,000)	(1,986,500)	(1,266,000)
Proceeds from borrowings under revolving credit facility	1,960,000	1,945,500	1,255,500
Shares repurchased and cancelled	(108,249)	(223,835)	(70,269)
Distributions to noncontrolling interests	(26,723)	(24,964)	(39,197)
Payment of deferred consideration	(29,774)	(49,221)	(63,170)
Proceeds from Noncontrolling Interests	(3,316)	0	(3,600)
Debt issuance costs	0	(844)	0
Net Cash Provided by (Used in) Financing Activities, Total	36,938	(339,864)	(186,736)
Effect of exchange rate changes on cash and cash equivalents	(5,723)	2,054	(7,995)
Net increase (decrease) in cash and cash equivalents	11,602	(100,852)	36,580
Cash and cash equivalents at beginning of period	119,737	220,589	184,009
Cash and cash equivalents at end of period	131,339	119,737	220,589
Supplemental Cash Flow Information:
Cash income taxes paid	23,906	45,538	41,235
Cash interest paid	91,050	87,068	70,935
Non-cash investing and financing activities:
Acquisitions of business	47,082	8,332	1,178
Noncash or Part Noncash Acquisition, Noncontrolling Interest Acquired	27,207	22,172	1,000
Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Shares Issued	341
Tax Receivable Agreement, Liability Established			30,556
Tax Receivables Agreement, Deferred Tax Liability Established			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
Non-cash payment on deferred acquisition	$ 18,208	$ 32,820	$ 989