Acquisitions and Dispositions - Narrative (Details) shares in Thousands, $ in Thousands, £ in Millions							3 Months Ended
	Oct. 03, 2022 USD ($)	Jul. 15, 2022 USD ($)	Jul. 12, 2022 USD ($)	May 31, 2022 USD ($)	Apr. 19, 2022 USD ($)	Apr. 01, 2022 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) shares	Mar. 31, 2022 USD ($)	Oct. 03, 2022 GBP (£)	Jul. 12, 2022 GBP (£)
Business Acquisition [Line Items]
Goodwill							$ 1,569,532	$ 1,566,956
Revenues							622,444		$ 642,903
Income attributable to noncontrolling interests							(5,460)		20,947
Net Income (Loss) Attributable to Parent							443		12,675
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest							(5,017)		$ 33,622
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							6,600
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest							1,000
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							2,600
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest							100
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
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
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	$ 11,864
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest							600
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	$ 23,404
Revenues							8,900
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	$ 25,793									£ 23.0
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest							(2,200)
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
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	6,160
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest							$ 200
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