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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2024
USD ($)
app_store
segment
reporting_unit
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
app_store
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Capitalized Contract Costs          
Amortization of capitalized contract costs     $ 696,600,000 $ 646,700,000  
Contract assets $ 28,600,000   $ 28,600,000 33,100,000 $ 38,200,000
Number of app stores | app_store 2   2    
Revenue from contract with customer, due date (no later than)     30 days    
Current deferred revenue $ 166,142,000   $ 166,142,000 211,282,000 252,700,000
Deferred revenue recognized     211,300,000 252,700,000  
Non-current deferred revenue 0   $ 0 0  
Cash equivalents:          
Maturity period from date of purchase for cash and cash equivalents (in days, less than)     91 days    
Property and Equipment          
Property and equipment, net $ 158,189,000   $ 158,189,000 194,525,000  
Goodwill and Indefinite-Lived Intangible Assets          
Number of operating segments | segment 4        
Number of reporting units | reporting_unit 4        
Impairments and amortization of intangibles     74,175,000 $ 47,731,000 $ 366,257,000
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]         Impairments and amortization of intangibles
Indefinite-lived intangible assets, fair value to carrying value, percentage (less than)       110.00%  
Indefinite-lived intangible assets with fair value less than 110% of carrying value       $ 76,500,000  
Reclassification from indefinite-lived intangible asset to definite-lived intangible asset     47,200,000    
Long-Lived Assets and Intangible Assets with Definite Lives          
Impairment of intangible assets     1,900,000   $ 25,800,000
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]         Impairments and amortization of intangibles
Advertising Costs          
Advertising expense     546,800,000 519,600,000 $ 474,900,000
MG Asia, Evergreen And Emerging Segment          
Goodwill and Indefinite-Lived Intangible Assets          
Impairment of intangible asset   $ 28,700,000      
Accumulated Foreign Currency Adjustment Attributable to Parent          
Foreign Currency Translation and Transaction Gains and Losses          
Amount of gains (losses) reclassified to earnings (less than in 2024)     100,000 0 0
Redeemable Noncontrolling Interests          
Redeemable Noncontrolling Interest          
Adjustment of redeemable noncontrolling interests to fair value     0 479,000 1,401,000
Trade names | Hyperconnect, Inc.          
Goodwill and Indefinite-Lived Intangible Assets          
Impairment of intangible asset         244,300,000
Europe | Trade names          
Goodwill and Indefinite-Lived Intangible Assets          
Impairment of intangible asset         43,900,000
United States          
Property and Equipment          
Property and equipment, net $ 119,638,000   $ 119,638,000 $ 143,502,000  
United States | Trade names          
Goodwill and Indefinite-Lived Intangible Assets          
Impairments and amortization of intangibles         $ 5,500,000
Minimum          
Capitalized Contract Costs          
Subscription period     7 days    
Minimum | App Store          
Capitalized Contract Costs          
Account receivable, collection term     30 days    
Minimum | Purchase Made Through Applications          
Capitalized Contract Costs          
Account receivable, collection term     3 days    
Minimum | Indefinite-lived Intangible Assets | Discount Rate          
Goodwill and Indefinite-Lived Intangible Assets          
Measurement input (as a percent)       0.15  
Minimum | Indefinite-lived Intangible Assets | Royalty Rate          
Goodwill and Indefinite-Lived Intangible Assets          
Measurement input (as a percent)       0.03  
Maximum          
Capitalized Contract Costs          
Subscription period     6 months    
Maximum | App Store          
Capitalized Contract Costs          
Account receivable, collection term     45 days    
Maximum | Purchase Made Through Applications          
Capitalized Contract Costs          
Account receivable, collection term     5 days    
Maximum | Indefinite-lived Intangible Assets | Discount Rate          
Goodwill and Indefinite-Lived Intangible Assets          
Measurement input (as a percent)       0.18  
Maximum | Indefinite-lived Intangible Assets | Royalty Rate          
Goodwill and Indefinite-Lived Intangible Assets          
Measurement input (as a percent)       0.08  
Software and Software Development Costs          
Property and Equipment          
Property and equipment, net $ 60,200,000   $ 60,200,000 $ 85,500,000  
Accounts Receivable | Customer Concentration Risk | App Store #1          
Capitalized Contract Costs          
Concentration risk (percent)     78.00% 79.00%  
Accounts Receivable | Customer Concentration Risk | App Store #2          
Capitalized Contract Costs          
Concentration risk (percent)     16.00% 8.00%