SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)		3 Months Ended	12 Months Ended
	Aug. 28, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Oct. 01, 2024
Disaggregation of Revenue [Line Items]
Revenue			$ 1,185,112,000	$ 1,358,748,000	$ 1,764,355,000
Amortization of contract assets			52,400,000	61,400,000
Current deferred revenue		$ 42,008,000	42,008,000	49,859,000	50,100,000
Non-current deferred revenue		100,000	100,000	100,000	100,000
Deferred revenue recognized			$ 45,400,000	48,000,000.0
Cash equivalents maturity period at purchase (less than)			91 days
Marketable debt securities		0	$ 0	0
Long-lived assets (excluding goodwill and intangible assets)		$ 79,564,000	79,564,000	109,527,000
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]		Amortization of Intangible Assets
Advertising expense			333,300,000	459,400,000	558,400,000
Purchase of noncontrolling interests	$ 16,000,000		16,019,000	$ 0	0
Net decrease to additional paid in capital related to purchase of noncontrolling interest			16,019,000
Additional Paid-in Capital
Disaggregation of Revenue [Line Items]
Net decrease to additional paid in capital related to purchase of noncontrolling interest	$ 11,300,000		11,296,000
Ads and Leads
Disaggregation of Revenue [Line Items]
Reporting unit, amount of fair value that exceeded carrying value		$ 494,500,000	494,500,000
Services revenue
Disaggregation of Revenue [Line Items]
Reporting unit, amount of fair value that exceeded carrying value		20,000,000.0	$ 20,000,000.0
Services revenue | Trade names
Disaggregation of Revenue [Line Items]
Indefinite-lived intangible assets of impairment charge		$ 2,600,000
Discount Rate | Minimum
Disaggregation of Revenue [Line Items]
Indefinite-lived impairment measure input		12.50%	12.50%	15.00%
Discount Rate | Maximum
Disaggregation of Revenue [Line Items]
Indefinite-lived impairment measure input		14.50%	14.50%	17.00%
Discount Rate | Ads and Leads
Disaggregation of Revenue [Line Items]
Reporting unit measurement input		0.13	0.13			0.125
Discount Rate | Services revenue
Disaggregation of Revenue [Line Items]
Reporting unit measurement input		0.14	0.14			0.135
Discount Rate | Services revenue | Trade names
Disaggregation of Revenue [Line Items]
Indefinite-lived impairment measure input		14.00%	14.00%
Discount Rate | International
Disaggregation of Revenue [Line Items]
Reporting unit measurement input		0.15	0.15
Royalty Rate | Minimum | Indefinite-lived Intangible Assets
Disaggregation of Revenue [Line Items]
Measurement input		0.025	0.025
Royalty Rate | Maximum | Indefinite-lived Intangible Assets
Disaggregation of Revenue [Line Items]
Measurement input		0.045	0.045
Royalty Rate | Services revenue | Trade names
Disaggregation of Revenue [Line Items]
Indefinite-lived impairment measure input		2.50%	2.50%
Capitalized internal use software
Disaggregation of Revenue [Line Items]
Long-lived assets (excluding goodwill and intangible assets)		$ 73,100,000	$ 73,100,000	$ 92,300,000
All other countries
Disaggregation of Revenue [Line Items]
Revenue			129,271,000	116,656,000	103,982,000
Cash equivalents		$ 600,000	$ 600,000	$ 0
Change In Accounting Principle, Recording Revenue On Net Basis
Disaggregation of Revenue [Line Items]
Revenue					$ (242,600,000)