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Subsequent Event - Additional Information (Detail) (USD $) | 12 Months Ended | 3 Months Ended | 0 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 | Jan. 06, 2015
Subsequent Event [Line Items] |  |  |  |  |
Cash dividend | $ 2.00 us-gaap_CommonStockDividendsPerShareDeclared | $ 1.15 us-gaap_CommonStockDividendsPerShareDeclared | $ 7.48 us-gaap_CommonStockDividendsPerShareDeclared |  |
Common and Class B Common Stock |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Cash dividend |  |  |  | $ 0.60 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = wso_CommonAndClassBCommonStockMember |
Subsequent Event | Common and Class B Common Stock |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Cash dividend |  |  |  |  | $ 0.70 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = wso_CommonAndClassBCommonStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_CommonStockDividendsPerShareDeclared
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Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Details
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |