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Basis of Presentation - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2024 Entity
Income Tax [Line Items]
Number of Joint Ventures	4
Minimum [Member] | Individual Tax Jurisdictions [Member]
Income Tax [Line Items]
Percentage threshold to disclose the amount of income taxes paid by individual jurisdictions	5.00%

X

- Definition

Income Tax.

+ References

No definition available.

+ Details

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

X

- Definition

Number of joint ventures. Joint ventures are entities operated by the controlling interest for the mutual benefit of the members.

+ References

No definition available.

+ Details

Name:	wso_NumberOfJointVentures
Namespace Prefix:	wso_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage threshold to disclose amount of income taxes paid by individual jurisdictions.

+ References

No definition available.

+ Details

Name:	wso_PercentageThresholdToDiscloseAmountOfIncomeTaxesPaidByIndividualJurisdictions
Namespace Prefix:	wso_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeTaxAuthorityAxis=wso_IndividualTaxJurisdictionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: