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Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
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

X

- 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

Name:	us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Financial Instrument [Line Items]

+ References

No definition available.

+ Details

Name:	wso_FinancialInstrumentLineItems
Namespace Prefix:	wso_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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