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Earnings Per Share - Schedule of Basic and Diluted Earnings per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net income attributable to Watsco, Inc. shareholders $ 55,092 $ 30,502
Less: distributed and undistributed earnings allocated to non-vested restricted common stock 6,054 5,233
Earnings allocated to Watsco, Inc. shareholders – Basic $ 49,038 $ 25,269
Weighted-average common shares outstanding – Basic 35,179,521 34,995,048
Basic earnings per share for Common and Class B common stock $ 1.39 $ 0.72
Net income attributable to Watsco, Inc. shareholders $ 55,092 $ 30,502
Less: distributed and undistributed earnings allocated to non-vested restricted common stock – Diluted 6,054 5,233
Earnings allocated to Watsco, Inc. shareholders – Diluted $ 49,038 $ 25,269
Weighted-average common shares outstanding – Basic 35,179,521 34,995,048
Effect of dilutive stock options 150,312 28,941
Weighted-average common shares outstanding – Diluted 35,329,833 35,023,989
Diluted earnings per share for Common and Class B common stock $ 1.39 $ 0.72
Anti-dilutive stock options not included above 5,911 164,130
Common Stock    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Earnings allocated to Watsco, Inc. shareholders – Basic $ 45,452 $ 23,409
Class B Common Stock    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Earnings allocated to Watsco, Inc. shareholders – Basic $ 3,586 $ 1,860