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Schedule of Basic and Diluted Earnings per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net income attributable to Watsco, Inc. shareholders $ 35,037 $ 34,219
Less: distributed and undistributed earnings allocated to non-vested restricted common stock - Basic 4,924 3,775
Earnings allocated to Watsco, Inc. shareholders - Basic $ 30,113 $ 30,444
Weighted-average common shares outstanding - Basic 34,388,117 34,254,331
Basic earnings per share for Common and Class B common stock $ 0.88 $ 0.89
Net income attributable to Watsco, Inc. shareholders $ 35,037 $ 34,219
Less: distributed and undistributed earnings allocated to non-vested restricted common stock - Diluted 4,924 3,775
Earnings allocated to Watsco, Inc. shareholders - Diluted $ 30,113 $ 30,444
Weighted-average common shares outstanding - Basic 34,388,117 34,254,331
Effect of dilutive stock options 14,485 65,779
Weighted-average common shares outstanding - Diluted 34,402,602 34,320,110
Diluted earnings per share for Common and Class B common stock $ 0.88 $ 0.89
Anti-dilutive stock options not included above 322,584 9,228
Common Stock    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Earnings allocated to Watsco, Inc. shareholders - Basic $ 27,856 $ 28,134
Class B Common Stock    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Earnings allocated to Watsco, Inc. shareholders - Basic $ 2,257 $ 2,310