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Comprehensive Income (Details) (USD $)
In Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Comprehensive Income        
Net income $ 52,272 $ 48,207 $ 63,394 $ 53,682
Changes in unrealized losses on derivative instrument, net of income tax expense of $45, $29, $89 and $40, respectively 73 47 144 68
Changes in unrealized losses on available-for-sale securities, net of income tax benefit (expense) of $3, $10, $(1) and $5, respectively (4) (14) 3 (4)
Comprehensive income 52,341 48,240 63,541 53,746
Less: comprehensive income attributable to noncontrolling interest 16,249 13,162 19,871 14,804
Comprehensive income attributable to Watsco, Inc. 36,092 35,078 43,670 38,942
Changes in unrealized losses on derivative instrument, income tax expense 45 29 89 40
Changes in unrealized losses on available-for-sale securities, income tax benefit (expense) $ 3 $ 10 $ (1) $ 5