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Supplier Concentration - Additional Information (Detail) (Supplier Concentration Risk)	12 Months Ended
	Dec. 31, 2014 Vendor	Dec. 31, 2013	Dec. 31, 2012
Concentration Risk [Line Items]
Percentage of purchases from key suppliers	76.00%us-gaap_ConcentrationRiskPercentage1	73.00%us-gaap_ConcentrationRiskPercentage1	72.00%us-gaap_ConcentrationRiskPercentage1
Number of key suppliers	4wso_NumberOfKeySuppliers
Carrier and Its Affiliates
Concentration Risk [Line Items]
Percentage of purchases from key suppliers	61.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wso_CarrierAndItsAffiliatesMember	59.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wso_CarrierAndItsAffiliatesMember	57.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wso_CarrierAndItsAffiliatesMember

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

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- Definition

Number of Key Suppliers

+ References

No definition available.

+ Details

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