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Earnings Per Share - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Earnings Per Share [Line Items] |  |  |
Convertible Class B common stock outstanding | 2,707,725 wso_ConvertibleClassBCommonStockOutstanding | 2,704,832 wso_ConvertibleClassBCommonStockOutstanding | 2,706,338 wso_ConvertibleClassBCommonStockOutstanding
Anti-dilutive stock options excluded from earnings per share | 9,984 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 1,066 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 17,492 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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- Definition Class B common stock securities that may be converted to Common stock securities at any time on a one-for-one basis at the option of the shareholder. + References No definition available. + Details
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- Details
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