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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
app_store
unit
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Capitalized Contract Costs      
Amortization of capitalized contract costs $ 414,700,000 $ 364,700,000  
Contract assets $ 33,500,000 28,500,000 $ 29,200,000
Number of app stores | app_store 2    
Current deferred revenue $ 239,088,000 218,843,000 209,900,000
Deferred revenue recognized 218,800,000 209,900,000  
Non-current deferred revenue $ 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 $ 107,799,000 101,065,000  
Goodwill and Indefinite-Lived Intangible Assets      
Number of reporting units | unit 1    
Indefinite-lived intangible assets for which fair value is less than 110% of carrying value $ 0 92,300,000  
Advertising Costs      
Advertising expense $ 438,700,000 $ 388,600,000 386,000,000.0
Income Taxes      
Tax benefits recognition basis for uncertain tax position likelihood realization (greater than) (as a percent) 50.00%    
Foreign Currency Translation and Transaction Gains and Losses      
Amount of gains (losses) reclassified to earnings $ (168,000)   (52,000)
Accounts Receivable | Customer Concentration Risk | App Store #1      
Capitalized Contract Costs      
Concentration risk (percent) 65.00% 56.00%  
Accounts Receivable | Customer Concentration Risk | App Store #2      
Capitalized Contract Costs      
Concentration risk (percent) 11.00% 13.00%  
Europe | Trade names      
Goodwill and Indefinite-Lived Intangible Assets      
Impairment of intangible asset $ 4,600,000 $ 6,600,000  
Foreign Currency Translation Adjustment      
Foreign Currency Translation and Transaction Gains and Losses      
Amount of gains (losses) reclassified to earnings (168,000) 0 (52,000)
Redeemable Noncontrolling Interests      
Redeemable Noncontrolling Interest      
Adjustment of redeemable noncontrolling interests to fair value $ 6,669,000 $ 11,554,000 $ 4,098,000
Minimum | Indefinite-lived Intangible Assets      
Goodwill and Indefinite-Lived Intangible Assets      
Royalty rate used for impairment assessment of indefinite-lived intangible assets (as a percent) 5.00% 3.00%  
Minimum | Indefinite-lived Intangible Assets | Discount Rate      
Goodwill and Indefinite-Lived Intangible Assets      
Measurement input (as a percent) 0.10 0.11  
Maximum | Indefinite-lived Intangible Assets      
Goodwill and Indefinite-Lived Intangible Assets      
Royalty rate used for impairment assessment of indefinite-lived intangible assets (as a percent) 8.00% 8.00%  
Maximum | Indefinite-lived Intangible Assets | Discount Rate      
Goodwill and Indefinite-Lived Intangible Assets      
Measurement input (as a percent) 0.23 0.26  
Software and Software Development Costs      
Property and Equipment      
Property and equipment, net $ 34,900,000 $ 27,500,000