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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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- Definition

Board approved quarterly cash dividend rate applicable to april twenty twenty one.

+ References

No definition available.

+ Details

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Namespace Prefix:	wso_
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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.

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No definition available.

+ Details

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Namespace Prefix:	wso_
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Period Type:	duration

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- Details

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