Acquisitions and Dispositions - Narrative (Details) - USD ($) $ in Thousands					3 Months Ended		9 Months Ended
	Jun. 02, 2025	May 01, 2025	Apr. 11, 2025	Apr. 02, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Business Acquisition [Line Items]
Deferred acquisition consideration					$ 28,100		$ 28,100
Goodwill					1,597,312		1,597,312		$ 1,554,146
Revenues					742,998	$ 711,281	2,101,556	$ 2,052,508
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest					$ 23,763	$ 13,864	$ 13,804	$ 9,197
ADK Group
Business Acquisition [Line Items]
Aggregate purchase price	$ 21,700
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 103
JetFuel
Business Acquisition [Line Items]
Aggregate purchase price		$ 22,200
Closing cash payment		10,300
Goodwill		$ 11,900
Shares issued by the Company (shares)		2,017,857
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned		$ 11,300
Business Combination, Consideration Transferred, Liabilities Incurred		700
JetFuel \| Customer Relationships
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		6,500
JetFuel \| Trade Names
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		1,000
JetFuel \| Maximum
Business Acquisition [Line Items]
Deferred acquisition consideration		$ 59,500
Create Group Holding Limited
Business Acquisition [Line Items]
Aggregate purchase price			$ 300	$ 15,700
Closing cash payment				11,500
Goodwill				$ 6,200
Shares issued by the Company (shares)				653,663
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned				$ 4,000
Business Combination, Consideration Transferred, Liabilities Incurred				200
Create Group Holding Limited \| Customer Relationships
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles				3,800
Create Group Holding Limited \| Trade Names
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles				600
Create Group Holding Limited \| Maximum
Business Acquisition [Line Items]
Deferred acquisition consideration				$ 24,000

Stagwell Inc 10-Q