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Acquisitions and Dispositions - Narrative (Details) $ in Thousands, € in Millions, ₪ in Millions, £ in Millions, R$ in Millions																					12 Months Ended
	Dec. 19, 2024 USD ($) shares	Dec. 19, 2024 EUR (€) shares	Oct. 01, 2024 USD ($) shares	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 (€)	Oct. 03, 2022 USD ($)	May 31, 2022 USD ($)	Apr. 19, 2022 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 19, 2024 EUR (€)	Jul. 19, 2024 ILS (₪)	Apr. 05, 2024 BRL (R$)	Apr. 04, 2024 EUR (€)	Mar. 01, 2024 GBP (£)	Dec. 31, 2021 USD ($)
Business Acquisition [Line Items]
Deferred acquisition consideration																					$ 28,100
Goodwill																					1,554,146	$ 1,498,815	$ 1,566,956						$ 1,652,723
Revenues																					2,841,216	2,527,177	2,687,792
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest																					25,044	41,642	$ 50,044
Huskies [Member]
Business Acquisition [Line Items]
Aggregate purchase price																$ 5,600	€ 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													1,006,711
Team Epiphany
Business Acquisition [Line Items]
Aggregate purchase price												$ 16,700
Closing cash payment												11,700
Deferred acquisition consideration												$ 17,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life												3 years
Goodwill												$ 8,452
Revenues																					47,400
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net												$ 16,669
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																						2,570,380
Business Acquisition, Pro Forma Net Income (Loss)																						42,891
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned												$ 5,000
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest																					2,000
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										$ 0	£ 0.1
PROS Agency
Business Acquisition [Line Items]
Aggregate purchase price						$ 8,500	R$ 42.1
Closing cash payment						4,700	R$ 23.3
Deferred acquisition consideration						2,700																				R$ 13.5
Goodwill						$ 5,400
Shares issued by the Company (shares) | shares						182,256	182,256
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned						$ 1,100																				5.3
PROS Agency | Maximum
Business Acquisition [Line Items]
Deferred acquisition consideration						$ 14,400																				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
Unicepta
Business Acquisition [Line Items]
Aggregate purchase price	$ 62,000	€ 60.1
Closing cash payment	24,000	€ 23.8
Deferred acquisition consideration	$ 11,000																							€ 10.6
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years	10 years
Goodwill	$ 33,291
Revenues																					1,700
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	$ 62,414
Shares issued by the Company (shares) | shares	3,390,788	3,390,788
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 35,312
Business Acquisition, Pro Forma Revenue																					2,892,586	2,579,374
Business Acquisition, Pro Forma Net Income (Loss)																					5,216	33,939
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned	26,000																							25.0
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest																					400
Business Combination, Consideration Transferred, Liabilities Incurred	$ 1,000	€ 0.7
Unicepta | Customer Relationships
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	12 years	12 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 22,083
Unicepta | Trade Names
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years	10 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 5,417
Unicepta | Other Intangible Assets
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years	5 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 7,812
Unicepta | Maximum
Business Acquisition [Line Items]
Deferred acquisition consideration	$ 42,000																							€ 40.0
Consulum
Business Acquisition [Line Items]
Aggregate purchase price			$ 82,800
Closing cash payment			58,300
Deferred acquisition consideration			$ 11,300
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			9 years
Goodwill			$ 16,593
Revenues																					14,700
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net			$ 82,752
Shares issued by the Company (shares) | shares			1,810,274
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			$ 57,200
Business Acquisition, Pro Forma Revenue																					2,893,599	2,585,024
Business Acquisition, Pro Forma Net Income (Loss)																					19,346	$ 49,039
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned			$ 12,900
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest																					$ (1,600)
Consulum | Customer Relationships
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			7 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			$ 43,800
Consulum | Trade Names
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			10 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			$ 13,400
Consulum | Maximum
Business Acquisition [Line Items]
Deferred acquisition consideration			$ 90,000
BNG
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue																				$ 2,698,000
Business Acquisition, Pro Forma Net Income (Loss)																				$ 49,300
TMA Direct
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue																			$ 2,691,600
Business Acquisition, Pro Forma Net Income (Loss)																			$ 51,400
Maru Group
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue																		$ 2,717,700
Business Acquisition, Pro Forma Net Income (Loss)																		36,000
Wolfgang
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue																		2,696,700
Business Acquisition, Pro Forma Net Income (Loss)																		51,400
Epicenter
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue																		2,691,000
Business Acquisition, Pro Forma Net Income (Loss)																		$ 49,700

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