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Acquisitions - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
0 Months Ended
Jul. 01, 2014
Jul. 02, 2012
Apr. 27, 2012
Jul. 01, 2009
Dec. 31, 2014
Location
Dec. 31, 2012
Apr. 29, 2011
Carrier Enterprise I              
Business Acquisition [Line Items]              
Controlling interest 80.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wso_CarrierEnterpriseOneMember
    60.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wso_CarrierEnterpriseOneMember
     
Non-controlling interest, ownership percentage       40.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wso_CarrierEnterpriseOneMember
     
Percentage of additional ownership acquired 10.00%wso_PercentageOfOwnershipInterestsAcquired
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wso_CarrierEnterpriseOneMember
10.00%wso_PercentageOfOwnershipInterestsAcquired
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wso_CarrierEnterpriseOneMember
         
Cash consideration $ 87,735us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wso_CarrierEnterpriseOneMember
$ 51,881us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wso_CarrierEnterpriseOneMember
         
Carrier Enterprise III              
Business Acquisition [Line Items]              
Controlling interest     60.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wso_CarrierEnterpriseCanadaLPMember
       
Non-controlling interest, ownership percentage     40.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wso_CarrierEnterpriseCanadaLPMember
       
Cash consideration     80,489us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wso_CarrierEnterpriseCanadaLPMember
       
Number of locations joint venture operates from         37us-gaap_NumberOfStores
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wso_CarrierEnterpriseCanadaLPMember
   
Goodwill and intangibles, purchase price allocation     216,463wso_BusinessAcquisitionPurchasePriceAllocationGoodwillAndIntangibleAssets
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wso_CarrierEnterpriseCanadaLPMember
       
Percent of tax basis of acquired goodwill amortized at a rate of 7%     75.00%wso_PercentageOfTaxBasisOfAcquiredGoodwillAmortized
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wso_CarrierEnterpriseCanadaLPMember
       
Goodwill amortization rate     7.00%wso_AnnualAmortizationRateForAcquiredGoodwill
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wso_CarrierEnterpriseCanadaLPMember
       
Fair value of acquired intangible assets     151,172wso_AcquiredFiniteAndIndefiniteLivedIntangibleAssets
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wso_CarrierEnterpriseCanadaLPMember
       
Identified intangible assets, trade names and distribution rights     95,515us-gaap_IndefinitelivedIntangibleAssetsAcquired
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wso_CarrierEnterpriseCanadaLPMember
       
Purchase price     173,739us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wso_CarrierEnterpriseCanadaLPMember
       
Transaction costs included in selling, general and administrative expenses           1,200us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wso_CarrierEnterpriseCanadaLPMember
 
Carrier Enterprise III | Customer Relationships              
Business Acquisition [Line Items]              
Finite-lived intangible assets, average useful life, in years     15 years        
Identified intangible assets, customer relationships     55,657us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wso_CarrierEnterpriseCanadaLPMember
       
UTC Canada              
Business Acquisition [Line Items]              
Shares issued to UTC Canada Corporation, an affiliate of Carrier Corporation     1,250,000wso_SharesIssuedToAffiliateOfPartyInJointVenture
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wso_UtcCanadaCorporationMember
       
Fair value of shares issued to UTC Canada Corporation     $ 93,250wso_FairValueOfSharesIssuedToPartyOfJointVenture
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wso_UtcCanadaCorporationMember
       
Carrier Enterprise II              
Business Acquisition [Line Items]              
Controlling interest             60.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wso_CarrierEnterpriseTwoMember
Non-controlling interest, ownership percentage             40.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wso_CarrierEnterpriseTwoMember