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Financial Instruments - Additional Information (Detail) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Financial Instrument [Line Items] |  |
Estimated fair value of contingent liability | $ 0 us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability |
Standby Letters of Credit |  |
Financial Instrument [Line Items] |  |
Fair value of contingent liability | 2,662,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_StandbyLettersOfCreditMember | 2,681,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_StandbyLettersOfCreditMember
Performance Bonds |  |
Financial Instrument [Line Items] |  |
Fair value of contingent liability | $ 2,300,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_LossContingenciesByNatureOfContingencyAxis = wso_PerformanceBondsMember | $ 800,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_LossContingenciesByNatureOfContingencyAxis = wso_PerformanceBondsMember

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- Definition The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | wso_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
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