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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 01, 2020 USD ($) unit | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jan. 01, 2018 USD ($)
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Current contract assets |  | $ 49,194,000 |  |  |  | $ 35,103,000 |  |  |  | $ 49,194,000 | $ 35,103,000 |  |
Non-current contract assets |  | 400,000 |  |  |  | 4,000,000.0 |  |  |  | 400,000 | 4,000,000.0 |  |
Deferred tax liability |  | 1,296,000 |  |  |  | 3,441,000 |  |  |  | 1,296,000 | 3,441,000 |  |
Retained earnings |  | 9,749,000 |  |  |  | 16,032,000 |  |  |  | 9,749,000 | 16,032,000 |  |
Revenue |  | 359,301,000 | $ 389,913,000 | $ 375,061,000 | $ 343,650,000 | 321,508,000 | $ 357,358,000 | $ 343,896,000 | $ 303,443,000 | 1,467,925,000 | 1,326,205,000 | $ 1,132,241,000 |
Amortization of contract assets |  |  |  |  |  |  |  |  |  | 64,800,000 | 56,800,000 | 50,000,000.0 |
Revenue reserve |  | 1,800,000 |  |  |  | 1,200,000 |  |  |  | 1,800,000 | 1,200,000 |  |
Deferred revenue recognized |  |  |  |  |  |  |  |  |  | 57,600,000 | 61,000,000.0 |  |
Current deferred revenue |  | 54,654,000 |  |  |  | 58,220,000 |  |  |  | 54,654,000 | 58,220,000 |  |
Non-current deferred revenue |  | 200,000 |  |  |  | 200,000 |  |  |  | $ 200,000 | 200,000 |  |
Cash equivalents maturity period at purchase (less than) |  |  |  |  |  |  |  |  |  | 91 days |  |  |
Marketable debt securities |  | 49,995,000 |  |  |  | 0 |  |  |  | $ 49,995,000 | 0 |  |
Number of reporting units | unit | 2 |  |  |  |  |  |  |  |  |  |  |  |
Market capitalization | $ 5,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Amount by which market capitalization exceeds carrying value | 4,300,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Asset Impairment |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Advertising expense |  |  |  |  |  |  |  |  |  | 487,600,000 | 484,300,000 | 334,700,000 |
Adjustment of redeemable noncontrolling interests to fair value |  |  |  |  |  |  |  |  |  | (1,645,000) | (8,242,000) | (1,244,000) |
Redeemable Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustment of redeemable noncontrolling interests to fair value |  |  |  |  |  |  |  |  |  | 1,600,000 | 8,200,000 | 1,200,000 |
Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Current contract assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 29,700,000
Non-current contract assets |  |  |  |  |  |  |  |  |  |  |  |  | 4,200,000
Deferred tax liability |  |  |  |  |  |  |  |  |  |  |  |  | 8,300,000
Retained earnings |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,600,000
International |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 88,689,000 | 91,450,000 | 81,600,000 |
Cash equivalents |  | $ 0 |  |  |  | $ 0 |  |  |  | 0 | 0 |  |
Europe |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 72,497,000 | 76,313,000 | 70,070,000 |
Amount by which market capitalization exceeds carrying value | 131,400,000 |  |  |  |  |  |  |  |  |  |  |  |
North America |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 1,395,428,000 | 1,249,892,000 | 1,062,171,000 |
Amount by which market capitalization exceeds carrying value | $ 4,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |
United States |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | $ 1,379,236,000 | $ 1,234,755,000 | $ 1,050,641,000 |
United States | Geographic Concentration Risk |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue concentration risk percentage (greater than) |  |  |  |  |  |  |  |  |  | 95.00% |  |  |
Effect of adoption of ASU No. 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | $ 73,800,000 |  |  |
Discount Rate | Europe |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input (as a percent) |  | 0.15 |  |  |  | 0.15 |  |  |  | 0.15 | 0.15 |  |
Discount Rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input (as a percent) |  | 0.115 |  |  |  | 0.115 |  |  |  | 0.115 | 0.115 |  |
Discount Rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input (as a percent) |  | 0.150 |  |  |  | 0.275 |  |  |  | 0.150 | 0.275 |  |
Royalty Rate | Indefinite-lived Intangible Assets | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input (as a percent) |  | 0.020 |  |  |  | 0.015 |  |  |  | 0.020 | 0.015 |  |
Royalty Rate | Indefinite-lived Intangible Assets | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement input (as a percent) |  | 0.055 |  |  |  | 0.055 |  |  |  | 0.055 | 0.055 |  |

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