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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income attributable to Watsco, Inc. shareholders $ 63,099 $ 57,968 $ 153,257 $ 146,439
Less: distributed and undistributed earnings allocated to non-vested restricted common stock 5,081 4,595 12,388 11,513
Earnings allocated to Watsco, Inc. shareholders - Basic $ 58,018 $ 53,373 $ 140,869 $ 134,926
Weighted-average common shares outstanding - Basic 32,613,995 32,458,906 32,567,073 32,421,350
Basic earnings per share for Common and Class B common stock $ 1.78 $ 1.64 $ 4.33 $ 4.16
Net income attributable to Watsco, Inc. shareholders $ 63,099 $ 57,968 $ 153,257 $ 146,439
Less: distributed and undistributed earnings allocated to non-vested restricted common stock 5,078 4,592 12,383 11,505
Earnings allocated to Watsco, Inc. shareholders - Diluted $ 58,021 $ 53,376 $ 140,874 $ 134,934
Weighted-average common shares outstanding - Basic 32,613,995 32,458,906 32,567,073 32,421,350
Effect of dilutive stock options 36,158 39,951 34,042 47,963
Weighted-average common shares outstanding - Diluted 32,650,153 32,498,857 32,601,115 32,469,313
Diluted earnings per share for Common and Class B common stock $ 1.78 $ 1.64 $ 4.32 $ 4.16
Anti-dilutive stock options not included above 3,565 16,332 18,876 58,169
Common Stock        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Earnings allocated to Watsco, Inc. shareholders - Basic $ 53,186 $ 48,893 $ 129,120 $ 123,588
Class B Common Stock        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Earnings allocated to Watsco, Inc. shareholders - Basic $ 4,832 $ 4,480 $ 11,749 $ 11,338