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Acquisitions and Dispositions - Narrative (Details) shares in Thousands, $ in Thousands, € in Millions, £ in Millions									3 Months Ended			6 Months Ended
	Apr. 25, 2023 USD ($)	Apr. 25, 2023 EUR (€)	Oct. 03, 2022 USD ($)	Jul. 15, 2022 USD ($)	Jul. 12, 2022 USD ($)	May 31, 2022 USD ($)	Apr. 19, 2022 USD ($)	Apr. 01, 2022 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($) shares	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Oct. 03, 2022 GBP (£)	Jul. 12, 2022 GBP (£)
Business Acquisition [Line Items]
Goodwill									$ 1,578,832	$ 1,566,956		$ 1,578,832
Revenues									632,265		$ 672,913	1,254,709	$ 1,315,816
Income attributable to noncontrolling interests									(5,552)		14,056	(11,012)	35,003
Net Income (Loss) Attributable to Parent									(4,693)		10,463	(4,250)	23,138
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest									(10,245)		$ 24,519	(15,262)	58,141
Hello Design
Business Acquisition [Line Items]
Aggregate purchase price								$ 4,600
Closing cash payment								3,600
Deferred acquisition consideration								$ 1,000
BNG
Business Acquisition [Line Items]
Aggregate purchase price							$ 20,900
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life							10 years
Goodwill							$ 24,643
Estimated contingent consideration							$ 50,000
Contingent consideration payable in cash (percent)							67.00%
Contingent consideration payable in equity (percent)							33.00%
Revenues									7,500			14,100	5,400
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest									(600)			500	(300)
BNG | Customer Relationships
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life							10 years
TMA Direct
Business Acquisition [Line Items]
Remaining ownership interest acquired (percent)						87.00%
Aggregate purchase price						$ 17,200
Deferred acquisition consideration						$ 500
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life						10 years
Goodwill						$ 6,569
Business Acquisition, Percentage of Voting Interests Acquired, Step One						13.00%
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High						$ 13,300
Revenues									3,900			6,500	1,300
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest									400			400	$ 300
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles						$ 13,200,000	$ 12,740
Business Acquisition, Percentage of Voting Interests Acquired, Step One						13.00%
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High						$ 13,300
TMA Direct | Customer Relationships
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						$ 1,800,000	$ 6,150
Epicenter
Business Acquisition [Line Items]
Closing cash payment			$ 9,900
Deferred acquisition consideration			$ 5,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			5 years
Goodwill			$ 4,416
Revenues									1,100			2,200
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net			$ 11,864
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest									(600)			100
PEP Group
Business Acquisition [Line Items]
Aggregate purchase price					$ 500
Estimated contingent consideration | £															£ 2.6
Apollo
Business Acquisition [Line Items]
Aggregate purchase price				$ 2,300
Payments to Acquire Business, First Payment				1,000
Payments to Acquire Business, Second Payment				$ 1,500
Maru Group
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			8 years
Goodwill			$ 26,733
Revenues									8,900			17,800
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net			25,794											£ 23.0
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest									(2,200)			(4,400)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			$ 14,300
Maru Group | Customer Relationships
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			$ 4,900
Wolfgang
Business Acquisition [Line Items]
Remaining ownership interest acquired (percent)			80.00%											80.00%
Closing cash payment			$ 3,800
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			5 years
Goodwill			$ 2,451
Revenues									1,100			2,100
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net			6,160
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest									$ 100			$ 100
Wolfgang | Common Class A
Business Acquisition [Line Items]
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable			$ 1,200
Shares issued by the Company (shares) | shares										175
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

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