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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) | 12 Months Ended
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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 |

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