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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 $ 876,787us-gaap_Revenues [1] $ 1,134,999us-gaap_Revenues [1] $ 1,170,186us-gaap_Revenues [1] $ 762,568us-gaap_Revenues [1] $ 827,352us-gaap_Revenues [1] $ 1,081,893us-gaap_Revenues [1] $ 1,120,452us-gaap_Revenues [1] $ 713,633us-gaap_Revenues [1] $ 3,944,540us-gaap_Revenues [1] $ 3,743,330us-gaap_Revenues [1] $ 3,431,712us-gaap_Revenues
Long-Lived Assets 627,267wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets       641,871wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets       627,267wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets 641,871wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets  
UNITED STATES                      
Geographic Area Information [Line Items]                      
Revenues                 3,525,176us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US
3,325,114us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US
3,087,256us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US
Long-Lived Assets 434,910wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets
/ us-gaap_StatementGeographicalAxis
= country_US
      429,202wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets
/ us-gaap_StatementGeographicalAxis
= country_US
      434,910wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets
/ us-gaap_StatementGeographicalAxis
= country_US
429,202wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets
/ us-gaap_StatementGeographicalAxis
= country_US
 
CANADA                      
Geographic Area Information [Line Items]                      
Revenues                 300,289us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_CA
318,165us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_CA
240,254us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_CA
Long-Lived Assets 187,064wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets
/ us-gaap_StatementGeographicalAxis
= country_CA
      207,340wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets
/ us-gaap_StatementGeographicalAxis
= country_CA
      187,064wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets
/ us-gaap_StatementGeographicalAxis
= country_CA
207,340wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets
/ us-gaap_StatementGeographicalAxis
= country_CA
 
MEXICO                      
Geographic Area Information [Line Items]                      
Revenues                 119,075us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_MX
100,051us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_MX
104,202us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_MX
Long-Lived Assets $ 5,293wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets
/ us-gaap_StatementGeographicalAxis
= country_MX
      $ 5,329wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets
/ us-gaap_StatementGeographicalAxis
= country_MX
      $ 5,293wso_EntityWideDisclosureOnGeographicAreaLongLivedAssets
/ us-gaap_StatementGeographicalAxis
= country_MX
$ 5,329wso_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.