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Supplemental Cash Flow Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash Flow Supplemental Disclosures [Line Items]      
Interest paid $ 4,393us-gaap_InterestPaid $ 5,334us-gaap_InterestPaid $ 2,802us-gaap_InterestPaid
Income taxes net of refunds 82,850us-gaap_IncomeTaxesPaidNet 73,168us-gaap_IncomeTaxesPaidNet 46,819us-gaap_IncomeTaxesPaidNet
Carrier Enterprise III      
Cash Flow Supplemental Disclosures [Line Items]      
Common stock issued for Carrier Enterprise III     $ 93,250wso_BusinessAcquisitionPurchasePriceAllocationFairValueOfSharesIssued
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wso_CarrierEnterpriseCanadaLPMember