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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Commitments and Contingencies Disclosure [Line Items] |  |
Self-insurance reserves | $ 9,658 | $ 9,747

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- Definition Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Commitments and Contingencies Disclosure [Line Items] + References No definition available. + Details
Name: | wso_CommitmentsAndContingenciesDisclosureLineItems
Namespace Prefix: | wso_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration