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Schedule of Basic and Diluted Earnings per Common Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income attributable to Watsco, Inc. shareholders $ 39,103 $ 36,023 $ 47,570 $ 43,523
Less: distributed and undistributed earnings allocated to non-vested (restricted) common stock - basic 2,704 2,456 3,298 2,832
Earnings allocated to Watsco, Inc. shareholders - basic 36,399 33,567 44,272 40,691
Weighted-average Common and Class B common shares outstanding for basic earnings per share 31,717,204 30,685,087 31,236,915 30,643,560
Basic earnings per share for Common and Class B Common stock $ 1.15 $ 1.09 $ 1.42 $ 1.33
Net income attributable to Watsco, Inc. shareholders 39,103 36,023 47,570 43,523
Less: distributed and undistributed earnings allocated to non-vested (restricted) common stock - diluted 2,702 2,453 3,297 2,831
Earnings allocated to Watsco, Inc. shareholders - diluted 36,401 33,570 44,273 40,692
Weighted-average Common and Class B common shares outstanding for basic earnings per share 31,717,204 30,685,087 31,236,915 30,643,560
Effect of dilutive stock options 66,503 85,208 72,173 88,973
Weighted-average Common and Class B common shares outstanding for diluted earnings per share 31,783,707 30,770,295 31,309,088 30,732,533
Diluted earnings per share for Common and Class B common stock $ 1.15 $ 1.09 $ 1.41 $ 1.32
Anti-dilutive stock options not included above 1,319 3,297 1,269 3,050
Common Stock
        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Earnings allocated to Watsco, Inc. shareholders - basic 33,137 30,445 40,244 36,901
Class B Common Stock
        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Earnings allocated to Watsco, Inc. shareholders - basic $ 3,262 $ 3,122 $ 4,028 $ 3,790