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

X

- 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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- 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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