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Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Standby Letters of Credit [Member] |  |
Financial Instrument [Line Items] |  |
Fair value of contingent liability | $ 350 | $ 150
Performance Bonds [Member] |  |
Financial Instrument [Line Items] |  |
Fair value of contingent liability | $ 12,700 | $ 13,600

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- Definition The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Financial Instrument [Line Items] + References No definition available. + Details
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Namespace Prefix: | wso_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=wso_PerformanceBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |