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Summary Of Significant Accounting Policies (Schedule Of Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Summary Of Significant Accounting Policies [Abstract]      
Net income $ 137,742 $ 111,722 $ 51,573
Changes in unrealized losses on derivative instruments, net of income tax expense of $146, $117 and $205, respectively 238 194 346
Changes in unrealized losses on available-for-sale securities, net of income tax expense (benefit) of $3, $19 and $(29), respectively 3 34 (42)
Comprehensive income 137,983 111,950 51,877
Less: comprehensive income attributable to noncontrolling interest 47,292 30,962 8,259
Comprehensive income attributable to Watsco, Inc. 90,691 80,988 43,618
Changes in unrealized losses on derivative instruments, income tax expense 146 117 205
Changes in unrealized losses on available-for-sale securities, income tax expense (benefit) $ 3 $ 19 $ (29)