Acquisitions and Dispositions - Assets Acquired and Liabilities Assumed (Details) $ in Thousands, £ in Millions	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Oct. 03, 2022 USD ($)	Oct. 03, 2022 GBP (£)	May 31, 2022 USD ($)	Apr. 19, 2022 USD ($)
Business Acquisition [Line Items]
Goodwill	$ 1,569,532	$ 1,566,956
BNG
Business Acquisition [Line Items]
Cash and cash equivalents						$ 2,766
Accounts receivable						10,147
Other current assets						671
Fixed assets						1,587
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill						12,740
Other assets						1,583
Accounts payable						(4,771)
Accruals and other liabilities						(6,880)
Advance billings						(1,159)
Other liabilities						(3,642)
Net liabilities assumed						13,042
Goodwill						24,643
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed Less Deferred Acquisition Consideration, Net						$ 37,685
TMA Direct
Business Acquisition [Line Items]
Accounts receivable					$ 582
Other current assets					669
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill					13,200
Accounts payable					(379)
Accruals and other liabilities					(270)
Noncontrolling interests					(2,667)
Net liabilities assumed					11,135
Goodwill					6,569
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed Less Deferred Acquisition Consideration, Net					$ 17,704
Maru Group
Business Acquisition [Line Items]
Cash and cash equivalents			$ 1,033
Accounts receivable			7,374
Other current assets			899
Fixed assets			157
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			14,300
Other assets			1,920
Accounts payable			(4,087)
Accruals and other liabilities			(9,154)
Advance billings			(6,462)
Other liabilities			(3,591)
Net liabilities assumed			2,389
Goodwill			23,404
Purchase price consideration			25,793	£ 23.0
Wolfgang
Business Acquisition [Line Items]
Cash and cash equivalents			1,606
Accounts receivable			1,180
Other current assets			100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			1,055
Other assets			46
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities			(278)
Net liabilities assumed			3,709
Goodwill			2,451
Purchase price consideration			6,160
Epicenter
Business Acquisition [Line Items]
Cash and cash equivalents			901
Other current assets			45
Accounts payable			(148)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other			(650)
Net liabilities assumed			7,448
Goodwill			4,416
Purchase price consideration			$ 11,864