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Subsequent Event - Additional Information (Detail) - $ / shares |  |  | 12 Months Ended
--- | --- | --- | ---
Apr. 01, 2021 | Feb. 09, 2021 | Dec. 31, 2020
Subsequent Event [Line Items] |  |  |
Cash dividend, common stock and Class B common stock previous rate |  |  | $ 1.775
Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Cash dividend, common stock and Class B common stock current rate rate |  | $ 1.95 |
Cash dividends payable date | 2021-04 |  |

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Board approved quarterly cash dividend rate applicable to april twenty twenty one. + References No definition available. + Details
Name: | wso_BoardApprovedQuarterlyCashDividendRateApplicableToAprilTwentyTwentyOne
Namespace Prefix: | wso_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Board approved quarterly cash dividend rate previous per share amount. + References No definition available. + Details
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Namespace Prefix: | wso_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Effective date of board approved quarterly cash dividend rate per share amount. + References No definition available. + Details
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Namespace Prefix: | wso_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

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