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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 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income attributable to Watsco, Inc. shareholders $ 41,005 $ 33,547 $ 88,575 $ 77,070
Less: distributed and undistributed earnings allocated to non-vested (restricted) common stock - basic 2,822 2,295 6,119 5,105
Earnings allocated to Watsco, Inc. shareholders - basic 38,183 31,252 82,456 71,965
Weighted-average Common and Class B common shares outstanding for basic earnings per share 32,107,701 30,694,844 31,529,296 30,660,843
Basic earnings per share for Common and Class B common stock $ 1.19 $ 1.02 $ 2.62 $ 2.35
Net income attributable to Watsco, Inc. shareholders 41,005 33,547 88,575 77,070
Less: distributed and undistributed earnings allocated to non-vested (restricted) common stock - diluted 2,820 2,293 6,115 5,101
Earnings allocated to Watsco, Inc. shareholders - diluted 38,185 31,254 82,460 71,969
Weighted-average Common and Class B common shares outstanding for basic earnings per share 32,107,701 30,694,844 31,529,296 30,660,843
Effect of dilutive stock options 60,465 63,688 68,242 80,452
Weighted-average Common and Class B common shares outstanding for diluted earnings per share 32,168,166 30,758,532 31,597,538 30,741,295
Diluted earnings per share for Common and Class B common stock $ 1.19 $ 1.02 $ 2.61 $ 2.34
Anti-dilutive stock options not included in above 2,283 132,750 11,445 22,322
Common Stock
        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Earnings allocated to Watsco, Inc. shareholders - basic 34,789 28,347 74,992 65,268
Class B Common Stock
        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Earnings allocated to Watsco, Inc. shareholders - basic $ 3,394 $ 2,905 $ 7,464 $ 6,697