Fair Value Measurement - Recurring and Non-recurring Basis (Details)
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12 Months Ended |
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Dec. 31, 2021
USD ($)
item
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Dec. 31, 2020
USD ($)
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Dec. 31, 2019
USD ($)
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| Reconciliation of the fair value measurements using significant unobservable inputs |
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| Equity securities, balance |
$ 223,385,000
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$ 96,659,000
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| Financial instruments measured on a recurring basis | Wealth management products |
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| Reconciliation of the fair value measurements using significant unobservable inputs |
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| Fair value changes, loss recognized |
59,300,000
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| Equity securities, balance |
50,200,000
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| Carrying value of impaired investments |
109,500,000
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| Non-recurring |
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| Reconciliation of the fair value measurements using significant unobservable inputs |
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| Impairment charge of goodwill recognized |
$ 0
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0
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$ 0
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| Significant Unobservable Inputs (Level 3) |
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| Reconciliation of the fair value measurements using significant unobservable inputs |
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| Valuation technique |
us-gaap:ValuationTechniqueDiscountedCashFlowMember
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| Measurement input |
wb:MeasurementInputDiscountCurveOfMarketInterestRatesMember
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| Significant Unobservable Inputs (Level 3) | Non-recurring | Minimum |
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| Reconciliation of the fair value measurements using significant unobservable inputs |
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| Discount rate (as a percent) | item |
0.17
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| Significant Unobservable Inputs (Level 3) | Non-recurring | Maximum |
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| Reconciliation of the fair value measurements using significant unobservable inputs |
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| Discount rate (as a percent) | item |
0.23
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| Significant Unobservable Inputs (Level 3) | Non-recurring | Certain investments under cost method and equity method were measured using significant unobservable inputs |
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| Reconciliation of the fair value measurements using significant unobservable inputs |
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| Impairment charge |
$ 106,800,000
|
126,800,000
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$ 230,900,000
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| Carrying value of impaired investments |
$ 14,500,000
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$ 89,500,000
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