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Subsequent Event - Additional Information (Detail) - $ / shares		3 Months Ended
	Apr. 24, 2017	Mar. 31, 2017	Mar. 31, 2016
Subsequent Event [Line Items]
Cash dividends paid per share of Common and Class B common stock		$ 1.05	$ 0.85
Subsequent Event
Subsequent Event [Line Items]
Cash dividend approved	$ 1.25

X

- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

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Period Type:	duration

X

- 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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Balance Type:	na
Period Type:	duration

X

- Definition

Board Approved Quarterly Cash Dividend Rate Applicable To July Twenty Seventeen.

+ References

No definition available.

+ Details

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Namespace Prefix:	wso_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Details

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