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Income Taxes - Summary of movement of valuation allowance (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Income Taxes |  |
Balance at the beginning of the year | ¥ 378,851 | ¥ 378,815
Additions | 54,097 | 47,941
Reversals | (74,379) | (47,905)
Balance at end of the year | ¥ 358,569 | ¥ 378,851

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the amount of addition in the period in the valuation allowance for a specified deferred tax asset. + References No definition available. + Details
Name: | wdh_ValuationAllowanceDeferredTaxAssetAdditionsAmount
Namespace Prefix: | wdh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents the amount of valuation allowance of a specified deferred tax asset reversed in the period. + References No definition available. + Details
Name: | wdh_ValuationAllowanceDeferredTaxAssetReversalAmount
Namespace Prefix: | wdh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration