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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, 2020
Mar. 31, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net income attributable to Watsco, Inc. shareholders $ 30,502 $ 35,037
Less: distributed and undistributed earnings allocated to non-vested restricted common stock 5,233 4,924
Earnings allocated to Watsco, Inc. shareholders - Basic $ 25,269 $ 30,113
Weighted-average common shares outstanding – Basic 34,995,048 34,388,117
Basic earnings per share for Common and Class B common stock $ 0.72 $ 0.88
Net income attributable to Watsco, Inc. shareholders $ 30,502 $ 35,037
Less: distributed and undistributed earnings allocated to non-vested restricted common stock - Diluted 5,233 4,924
Earnings allocated to Watsco, Inc. shareholders - Diluted $ 25,269 $ 30,113
Weighted-average common shares outstanding – Basic 34,995,048 34,388,117
Effect of dilutive stock options 28,941 14,485
Weighted-average common shares outstanding – Diluted 35,023,989 34,402,602
Diluted earnings per share for Common and Class B common stock $ 0.72 $ 0.88
Anti-dilutive stock options not included above 164,130 322,584
Common Stock    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Earnings allocated to Watsco, Inc. shareholders - Basic $ 23,409 $ 27,856
Class B Common Stock    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Earnings allocated to Watsco, Inc. shareholders - Basic $ 1,860 $ 2,257