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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
12 Months Ended
Dec. 31, 2021
USD ($)
app_store
unit
$ / shares
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Discontinued Operations      
Cash received per share in transaction (USD per share) | $ / shares $ 3.00    
Capitalized Contract Costs      
Amortization of capitalized contract costs $ 552,600,000 $ 414,700,000  
Contract assets $ 41,700,000 33,500,000 $ 28,500,000
Number of app stores | app_store 2    
Current deferred revenue $ 262,131,000 239,088,000 218,800,000
Deferred revenue recognized 239,100,000 218,800,000  
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 $ 163,256,000 107,799,000  
Goodwill and Indefinite-Lived Intangible Assets      
Number of reporting units | unit 1    
Advertising Costs      
Advertising expense $ 510,300,000 438,700,000 388,600,000
Foreign Currency Translation and Transaction Gains and Losses      
Amount of gains (losses) reclassified to earnings   $ (168,000)  
New Match Common Stock      
Discontinued Operations      
Stock issued in transaction per parent company share (shares) | shares 1    
Cash received per share in transaction (USD per share) | $ / shares $ 3.00    
Accounts Receivable | Customer Concentration Risk | App Store #1      
Capitalized Contract Costs      
Concentration risk (percent) 67.00% 65.00%  
Accounts Receivable | Customer Concentration Risk | App Store #2      
Capitalized Contract Costs      
Concentration risk (percent) 12.00% 11.00%  
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 $ 0 (168,000) 0
Redeemable Noncontrolling Interests      
Redeemable Noncontrolling Interest      
Adjustment of redeemable noncontrolling interests to fair value $ 2,667,000 $ 6,669,000 $ 11,554,000
Minimum      
Capitalized Contract Costs      
Subscription period 1 month    
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% 5.00%  
Minimum | Indefinite-lived Intangible Assets | Discount Rate      
Goodwill and Indefinite-Lived Intangible Assets      
Measurement input (as a percent) 0.10 0.10  
Maximum      
Capitalized Contract Costs      
Subscription period 6 months    
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) 0.16 0.23  
Software and Software Development Costs      
Property and Equipment      
Property and equipment, net $ 53,500,000 $ 39,700,000