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The Company and Summary of Significant Accounting Policies - The Company (Details)
shares in Millions, $ in Billions
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
shares
Dec. 31, 2020
segment
Jul. 17, 2020
USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Number of reportable segments | segment   1  
Held-for-sale | Classifieds      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Amount of consideration to be received, subject to adjustments     $ 9.2
Forecast | Held-for-sale | Classifieds      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds from sale of business $ 2.5    
Number of shares to be received from the sale | shares 540