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Revenues and Long-Lived Assets by Geographical Area (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Geographic Area Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 876,787 us-gaap_Revenues | [1] | $ 1,134,999 us-gaap_Revenues | [1] | $ 1,170,186 us-gaap_Revenues | [1] | $ 762,568 us-gaap_Revenues | [1] | $ 827,352 us-gaap_Revenues | [1] | $ 1,081,893 us-gaap_Revenues | [1] | $ 1,120,452 us-gaap_Revenues | [1] | $ 713,633 us-gaap_Revenues | [1] | $ 3,944,540 us-gaap_Revenues | [1] | $ 3,743,330 us-gaap_Revenues | [1] | $ 3,431,712 us-gaap_Revenues
Long-Lived Assets | 627,267 wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets |  |  |  |  |  |  |  | 641,871 wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets |  |  |  |  |  |  |  | 627,267 wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets |  | 641,871 wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets |  |
UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Geographic Area Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,525,176 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US |  | 3,325,114 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US |  | 3,087,256 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US
Long-Lived Assets | 434,910 wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets / us-gaap_StatementGeographicalAxis = country_US |  |  |  |  |  |  |  | 429,202 wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets / us-gaap_StatementGeographicalAxis = country_US |  |  |  |  |  |  |  | 434,910 wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets / us-gaap_StatementGeographicalAxis = country_US |  | 429,202 wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets / us-gaap_StatementGeographicalAxis = country_US |  |
CANADA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Geographic Area Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,289 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_CA |  | 318,165 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_CA |  | 240,254 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_CA
Long-Lived Assets | 187,064 wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets / us-gaap_StatementGeographicalAxis = country_CA |  |  |  |  |  |  |  | 207,340 wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets / us-gaap_StatementGeographicalAxis = country_CA |  |  |  |  |  |  |  | 187,064 wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets / us-gaap_StatementGeographicalAxis = country_CA |  | 207,340 wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets / us-gaap_StatementGeographicalAxis = country_CA |  |
MEXICO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Geographic Area Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 119,075 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_MX |  | 100,051 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_MX |  | 104,202 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_MX
Long-Lived Assets | $ 5,293 wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets / us-gaap_StatementGeographicalAxis = country_MX |  |  |  |  |  |  |  | $ 5,329 wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets / us-gaap_StatementGeographicalAxis = country_MX |  |  |  |  |  |  |  | $ 5,293 wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets / us-gaap_StatementGeographicalAxis = country_MX |  | $ 5,329 wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets / us-gaap_StatementGeographicalAxis = country_MX |  |
[1] | Sales of residential central air conditioners, heating equipment and parts and supplies are seasonal. Demand related to the residential central air conditioning replacement market is typically highest in the second and third quarters and demand for heating equipment is usually highest in the fourth quarter. Demand related to the new construction sectors throughout most of the markets is fairly consistent during the year, except for dependence on housing completions and related weather and economic conditions.

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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