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Schedule of Basic and Diluted Earnings per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income attributable to Watsco, Inc. shareholders $ 57,968 $ 54,461 $ 146,439 $ 127,315
Less: distributed and undistributed earnings allocated to non-vested restricted common stock 4,595 4,106 11,513 9,644
Earnings allocated to Watsco, Inc. shareholders - Basic $ 53,373 $ 50,355 $ 134,926 $ 117,671
Weighted-average common shares outstanding - Basic 32,458,906 32,330,888 32,421,350 32,292,559
Basic earnings per share for Common and Class B common stock $ 1.64 $ 1.56 $ 4.16 $ 3.64
Net income attributable to Watsco, Inc. shareholders $ 57,968 $ 54,461 $ 146,439 $ 127,315
Less: distributed and undistributed earnings allocated to non-vested restricted common stock 4,592 4,103 11,505 9,635
Earnings allocated to Watsco, Inc. shareholders - Diluted $ 53,376 $ 50,358 $ 134,934 $ 117,680
Weighted-average common shares outstanding - Basic 32,458,906 32,330,888 32,421,350 32,292,559
Effect of dilutive stock options 39,951 45,051 47,963 52,509
Weighted-average common shares outstanding - Diluted 32,498,857 32,375,939 32,469,313 32,345,068
Diluted earnings per share for Common and Class B common stock $ 1.64 $ 1.56 $ 4.16 $ 3.64
Anti-dilutive stock options not included above 16,332 28,565 58,169 7,788
Common Stock        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Earnings allocated to Watsco, Inc. shareholders - Basic $ 48,893 $ 46,138 $ 123,588 $ 107,804
Class B Common Stock        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Earnings allocated to Watsco, Inc. shareholders - Basic $ 4,480 $ 4,217 $ 11,338 $ 9,867