2.2.0.7 true Sheet 00090 - Document - Document and Entity Information Document and Entity Information http://www.watsco.com/taxonomy/role/DocumentDocumentAndEntityInformationAbstract false R1.xml false Sheet 00100 - Statement - CONDENSED CONSOLIDATED UNAUDITED STATEMENTS OF INCOME CONDENSED CONSOLIDATED UNAUDITED STATEMENTS OF INCOME http://www.watsco.com/taxonomy/role/StatementOfIncome false R2.xml false Sheet 00200 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS CONDENSED CONSOLIDATED BALANCE SHEETS http://www.watsco.com/taxonomy/role/StatementOfFinancialPositionClassified false R3.xml false Sheet 00205 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) http://www.watsco.com/taxonomy/role/StatementOfFinancialPositionClassifiedParenthetical false R4.xml false Sheet 00300 - Statement - CONDENSED CONSOLIDATED UNAUDITED STATEMENTS OF CASH FLOWS CONDENSED CONSOLIDATED UNAUDITED STATEMENTS OF CASH FLOWS http://www.watsco.com/taxonomy/role/StatementOfCashFlowsIndirect false R5.xml false Sheet 10101 - Disclosure - BASIS OF PRESENTATION BASIS OF PRESENTATION http://www.watsco.com/taxonomy/role/NotesToFinancialStatementsOrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock false R6.xml false Sheet 10201 - Disclosure - EARNINGS PER SHARE EARNINGS PER SHARE http://www.watsco.com/taxonomy/role/NotesToFinancialStatementsEarningsPerShareTextBlock false R7.xml false Sheet 10301 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS DERIVATIVE FINANCIAL INSTRUMENTS http://www.watsco.com/taxonomy/role/NotesToFinancialStatementsDerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock false R8.xml false Sheet 10401 - Disclosure - FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS http://www.watsco.com/taxonomy/role/NotesToFinancialStatementsFairValueDisclosuresTextBlock false R9.xml false Sheet 10501 - Disclosure - COMPREHENSIVE INCOME COMPREHENSIVE INCOME http://www.watsco.com/taxonomy/role/NotesToFinancialStatementsComprehensiveIncomeNoteTextBlock false R10.xml false Sheet 10601 - Disclosure - ACQUISITIONS ACQUISITIONS http://www.watsco.com/taxonomy/role/NotesToFinancialStatementsBusinessCombinationDisclosureTextBlock false R11.xml false Sheet 10701 - Disclosure - SHAREHOLDERS' EQUITY SHAREHOLDERS' EQUITY http://www.watsco.com/taxonomy/role/NotesToFinancialStatementsStockholdersEquityNoteDisclosureTextBlock false R12.xml false Sheet 10801 - Disclosure - COMMITMENTS AND CONTINGENCIES COMMITMENTS AND CONTINGENCIES http://www.watsco.com/taxonomy/role/NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlock false R13.xml false Sheet 10901 - Disclosure - RELATED PARTY TRANSACTIONS RELATED PARTY TRANSACTIONS http://www.watsco.com/taxonomy/role/NotesToFinancialStatementsRelatedPartyTransactionsDisclosureTextBlock false R14.xml false Sheet 11001 - Disclosure - SUPPLEMENTAL CASH FLOW INFORMATION SUPPLEMENTAL CASH FLOW INFORMATION http://www.watsco.com/taxonomy/role/DisclosureSupplementalCashFlowInformation false R15.xml false Book All Reports All Reports false 1 15 2 0 3 89 false false As_Of_9_30_20103 2 As_Of_11_2_2010 1 As_Of_12_31_2008 1 Duration_1_1_2010_To_9_30_2010 57 Duration_7_1_2009_To_9_30_2009 13 Duration_7_1_2010_To_9_30_2010 13 As_Of_9_30_2009 1 As_Of_12_31_20093 2 As_Of_9_30_20102 2 As_Of_11_2_20102 1 As_Of_12_31_20092 2 As_Of_9_30_2010 28 As_Of_12_31_2009 28 Duration_1_1_2009_To_12_31_2009 1 Duration_1_1_2009_To_9_30_2009 36 true true