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Fair Value Measurement - Recurring and Non-recurring Basis (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Fair Value Measurement |  |  |  |
Fair value wealth management |  | $ 0 | $ 0 |
Impairment charge of goodwill recognized | $ 0 | 0 |  |
Impairment charge of intangible assets recognized |  |  | 10,200,000 |
Recurring |  |  |  |
Fair Value Measurement |  |  |  |
Fair value change loss for equity securities with readily determinable fair values |  |  | 196,600,000 |
Fair value change gain for equity securities with readily determinable fair values |  | 32,100,000 |  |
Recurring | Wealth Management Products |  |  |  |
Fair Value Measurement |  |  |  |
Fair value loss |  |  | 47,000,000.0 |
Non-recurring |  |  |  |
Fair Value Measurement |  |  |  |
Impairment charge of goodwill recognized |  | $ 0 | 0 | $ 0
Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value Measurement |  |  |  |
Valuation technique |  | us-gaap:ValuationTechniqueDiscountedCashFlowMember |  |
Measurement input |  | wb:MeasurementInputDiscountCurveOfMarketInterestRatesMember |  |
Significant Unobservable Inputs (Level 3) | Non-recurring |  |  |  |
Fair Value Measurement |  |  |  |
Carrying value of impaired investments |  | $ 0 | $ 17,800,000 |
Investment, Type [Extensible Enumeration] |  | wb:CertainInvestmentsUnderCostMethodAndEquityMethodUsingUnobservableInputsMember | wb:CertainInvestmentsUnderCostMethodAndEquityMethodUsingUnobservableInputsMember | wb:CertainInvestmentsUnderCostMethodAndEquityMethodUsingUnobservableInputsMember
Impairment |  | $ 25,700,000 | $ 63,500,000 | $ 106,800,000
Significant Other Observable Inputs (Level 2) | Recurring | Unsecured senior notes |  |  |  |
Fair Value Measurement |  |  |  |
Fair value debt amount |  | 1,438,200,000 | $ 1,355,600,000 |
Significant Other Observable Inputs (Level 2) | Recurring | Convertible notes |  |  |  |
Fair Value Measurement |  |  |  |
Fair value debt amount |  | $ 356,000,000.0 |  |

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