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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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income attributable to Watsco, Inc. shareholders $ 51,318 $ 39,103 $ 64,703 $ 47,570
Less: distributed and undistributed earnings allocated to non-vested (restricted) common stock - basic 3,629 2,704 4,566 3,298
Earnings allocated to Watsco, Inc. shareholders - basic 47,689 36,399 60,137 44,272
Weighted-average Common and Class B common shares outstanding for basic earnings per share 32,182,576 31,717,204 32,170,222 31,236,915
Basic earnings per share for Common and Class B common stock $ 1.48 $ 1.15 $ 1.87 $ 1.42
Net income attributable to Watsco, Inc. shareholders 51,318 39,103 64,703 47,570
Less: distributed and undistributed earnings allocated to non-vested (restricted) common stock - diluted 3,623 2,702 4,560 3,297
Earnings allocated to Watsco, Inc. shareholders - diluted 47,695 36,401 60,143 44,273
Weighted-average Common and Class B common shares outstanding for basic earnings per share 32,182,576 31,717,204 32,170,222 31,236,915
Effect of dilutive stock options 66,279 66,503 61,024 72,173
Weighted-average Common and Class B common shares outstanding for diluted earnings per share 32,248,855 31,783,707 32,231,246 31,309,088
Diluted earnings per share for Common and Class B common stock $ 1.48 $ 1.15 $ 1.87 $ 1.41
Anti-dilutive stock options not included above   1,319,000   1,269,000
Common Stock
        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Earnings allocated to Watsco, Inc. shareholders - basic 43,681 33,137 55,081 40,244
Class B Common Stock
        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Earnings allocated to Watsco, Inc. shareholders - basic $ 4,008 $ 3,262 $ 5,056 $ 4,028