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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
Mar. 31, 2013
Mar. 31, 2012
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net income attributable to Watsco, Inc. shareholders $ 13,385 $ 8,466
Less: distributed and undistributed earnings allocated to non-vested (restricted) common stock - basic 937 1,408
Earnings allocated to Watsco, Inc. shareholders - basic 12,448 7,058
Weighted-average Common and Class B common shares outstanding for basic earnings per share 32,157,729 30,756,626
Basic earnings per share for Common and Class B common stock $ 0.39 $ 0.23
Net income attributable to Watsco, Inc. shareholders 13,385 8,466
Less: distributed and undistributed earnings allocated to non-vested (restricted) common stock - diluted 937 1,408
Earnings allocated to Watsco, Inc. shareholders - diluted 12,448 7,058
Weighted-average Common and Class B common shares outstanding for basic earnings per share 32,157,729 30,756,626
Effect of dilutive stock options 55,711 77,842
Weighted-average Common and Class B common shares outstanding for diluted earnings per share 32,213,440 30,834,468
Diluted earnings per share for Common and Class B common stock $ 0.39 $ 0.23
Common Stock
    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Earnings allocated to Watsco, Inc. shareholders - basic 11,401 6,405
Class B Common Stock
    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Earnings allocated to Watsco, Inc. shareholders - basic $ 1,047 $ 653