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Acquisitions - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended |  |  |  |
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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 | $ 87,735 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wso_CarrierEnterpriseOneMember | $ 51,881 us-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 |  |  | 80,489 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wso_CarrierEnterpriseCanadaLPMember |  |  |  |
Number of locations joint venture operates from |  |  |  |  | 37 us-gaap_NumberOfStores / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wso_CarrierEnterpriseCanadaLPMember |  |
Goodwill and intangibles, purchase price allocation |  |  | 216,463 wso_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 |  |  | 151,172 wso_AcquiredFiniteAndIndefiniteLivedIntangibleAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wso_CarrierEnterpriseCanadaLPMember |  |  |  |
Identified intangible assets, trade names and distribution rights |  |  | 95,515 us-gaap_IndefinitelivedIntangibleAssetsAcquired / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wso_CarrierEnterpriseCanadaLPMember |  |  |  |
Purchase price |  |  | 173,739 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wso_CarrierEnterpriseCanadaLPMember |  |  |  |
Transaction costs included in selling, general and administrative expenses |  |  |  |  |  | 1,200 us-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 |  |  | 55,657 us-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 |  |  | 1,250,000 wso_SharesIssuedToAffiliateOfPartyInJointVenture / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wso_UtcCanadaCorporationMember |  |  |  |
Fair value of shares issued to UTC Canada Corporation |  |  | $ 93,250 wso_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

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- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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