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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 | 38,195 us-gaap_RevenueFromRelatedParties / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wso_CarrierAndItsAffiliatesMember | 30,819 us-gaap_RevenueFromRelatedParties / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wso_CarrierAndItsAffiliatesMember | 32,961 us-gaap_RevenueFromRelatedParties / 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 + Details
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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)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 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 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.1(c)) -URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 07 -Paragraph b -Subparagraph 1 -Article 6 + Details
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