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Related Party Transactions - Additional Information (Detail) (Supplier Concentration Risk, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transaction [Line Items]
Percentage of purchases from key suppliers	76.00%us-gaap_ConcentrationRiskPercentage1	73.00%us-gaap_ConcentrationRiskPercentage1	72.00%us-gaap_ConcentrationRiskPercentage1
Carrier and Its Affiliates
Related Party Transaction [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
Amount payable to Carrier and its affiliates, net of receivables	(61,000)us-gaap_RelatedPartyTransactionDueFromToRelatedParty / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wso_CarrierAndItsAffiliatesMember	(53,000)us-gaap_RelatedPartyTransactionDueFromToRelatedParty / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wso_CarrierAndItsAffiliatesMember
Revenues from sales to Carrier and its affiliates	38,195us-gaap_RevenueFromRelatedParties / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wso_CarrierAndItsAffiliatesMember	30,819us-gaap_RevenueFromRelatedParties / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wso_CarrierAndItsAffiliatesMember	32,961us-gaap_RevenueFromRelatedParties / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wso_CarrierAndItsAffiliatesMember

X

- 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)

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- Definition

Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(k)(1))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

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-Section 50

-Paragraph 1

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(e))

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Related Parties

-URI http://asc.fasb.org/extlink&oid=16382449



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

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