Acquisitions and Dispositions - Narrative (Details) $ in Thousands, € in Millions, ₪ in Millions, £ in Millions, R$ in Millions															3 Months Ended		9 Months Ended
	Jul. 19, 2024 USD ($) shares	Jul. 19, 2024 ILS (₪) shares	Apr. 05, 2024 USD ($) shares	Apr. 05, 2024 BRL (R$) shares	Apr. 04, 2024 USD ($)	Apr. 04, 2024 EUR (€)	Mar. 01, 2024 USD ($) shares	Mar. 01, 2024 GBP (£) shares	Jan. 02, 2024 USD ($) shares	Nov. 01, 2023 USD ($) shares	Oct. 02, 2023 USD ($) shares	Jul. 03, 2023 USD ($)	Apr. 25, 2023 USD ($)	Apr. 25, 2023 EUR (€)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Jul. 19, 2024 ILS (₪)	Apr. 05, 2024 BRL (R$)	Apr. 04, 2024 EUR (€)	Mar. 01, 2024 GBP (£)	Dec. 31, 2023 USD ($)
Business Acquisition [Line Items]
Goodwill															$ 1,521,005		$ 1,521,005						$ 1,498,815
Revenues															711,281	$ 617,573	2,052,508	$ 1,872,282
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest															13,864	3,117	9,197	(4,717)
Huskies [Member]
Business Acquisition [Line Items]
Aggregate purchase price													$ 6,000	€ 5.2
Goodwill													2,600
Business Combination, Payables to Sellers													$ 1,000	€ 0.9
Tinsel
Business Acquisition [Line Items]
Aggregate purchase price												$ 2,500
Goodwill												$ 1,600
Left Field Labs
Business Acquisition [Line Items]
Aggregate purchase price											$ 13,200
Closing cash payment											9,400
Deferred acquisition consideration											51,000
Goodwill											$ 7,900
Shares issued by the Company (shares) | shares											825,402
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned											$ 3,800
Movers and Shakers LLC
Business Acquisition [Line Items]
Aggregate purchase price										$ 14,700
Closing cash payment										10,200
Deferred acquisition consideration										35,000
Goodwill										8,200
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned										$ 4,500
Movers and Shakers LLC | Common Class A
Business Acquisition [Line Items]
Shares issued by the Company (shares) | shares										1,000,000
Team Epiphany
Business Acquisition [Line Items]
Aggregate purchase price									$ 15,800
Closing cash payment									10,800
Deferred acquisition consideration									$ 17,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									3 years
Goodwill									$ 7,237
Revenues															12,300		36,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net									$ 15,848
Shares issued by the Company (shares) | shares									797,916
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles									$ 4,316
Business Acquisition, Pro Forma Revenue																629,821		1,902,785
Business Acquisition, Pro Forma Net Income (Loss)																$ 4,159		$ (1,814)
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned									$ 5,000
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest															$ 500		$ 1,200
Team Epiphany | Customer Relationships
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									3 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles									$ 3,767
Team Epiphany | Trade Names
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									3 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles									$ 549
Sidekick Live Limited
Business Acquisition [Line Items]
Aggregate purchase price							$ 6,000	£ 4.6
Closing cash payment							5,000	£ 3.6
Deferred acquisition consideration							10,000															£ 8.0
Goodwill							$ 2,000
Shares issued by the Company (shares) | shares							195,431	195,431
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned							$ 1,000															£ 0.9
Business Combination, Consideration Transferred, Liabilities Incurred							$ 200	£ 0.1
PROS Agency
Business Acquisition [Line Items]
Aggregate purchase price			$ 9,000	R$ 42.1
Closing cash payment			5,000	R$ 23.3
Deferred acquisition consideration			3,000																	R$ 13.5
Goodwill			$ 5,500
Shares issued by the Company (shares) | shares			182,256	182,256
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned			$ 1,000																	5.3
PROS Agency | Maximum
Business Acquisition [Line Items]
Deferred acquisition consideration			$ 14,000																	R$ 72.5
What's Next Partners
Business Acquisition [Line Items]
Aggregate purchase price					$ 5,000	€ 4.3
Deferred acquisition consideration					9,000																€ 8.5
Goodwill					$ 5,400
Leaders
Business Acquisition [Line Items]
Aggregate purchase price	$ 7,000	₪ 25.2
Closing cash payment	3,000	₪ 10.9
Deferred acquisition consideration	3,000																		₪ 10.9
Goodwill	$ 4,900
Shares issued by the Company (shares) | shares	135,010	135,010
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	$ 1,000																		3.5
Leaders | Maximum
Business Acquisition [Line Items]
Deferred acquisition consideration	$ 7,000																		₪ 24.2