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Earnings Per Share (Schedule Of Basic And Diluted Earnings Per Common Share) (Details) (USD $)
In Thousands, except Share data
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Basic Earnings per Share:        
Net income attributable to Watsco, Inc. shareholders $ 36,023 $ 35,045 $ 43,523 $ 38,878
Less: distributed and undistributed earnings allocated to non-vested (restricted) common stock 2,456 2,100 2,832 2,342
Earnings allocated to Watsco, Inc. shareholders 33,567 32,945 40,691 36,536
Weighted-average Common and Class B common shares outstanding for basic earnings per share 30,685,087 30,461,079 30,643,560 30,413,994
Basic earnings per share for Common and Class B Common stock $ 1.09 $ 1.08 $ 1.33 $ 1.20
Diluted Earnings per Share:        
Net income attributable to Watsco, Inc. shareholders 36,023 35,045 43,523 38,878
Less: distributed and undistributed earnings allocated to non-vested (restricted) common stock 2,453 2,097 2,831 2,341
Earnings allocated to Watsco, Inc. shareholders 33,570 32,948 40,692 36,537
Common Stock [Member]
        
Basic Earnings per Share:        
Earnings allocated to Watsco, Inc. shareholders 30,445 29,844 36,901 33,092
Class B Common Stock [Member]
        
Basic Earnings per Share:        
Earnings allocated to Watsco, Inc. shareholders $ 3,122 $ 3,101 $ 3,790 $ 3,444
Weighted-average Common and Class B common shares outstanding for basic earnings per share 30,685,087 30,461,079 30,643,560 30,413,994