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Earnings Per Share - Schedule of Basic and Diluted Earnings per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Basic Earnings per Share:      
Net income attributable to Watsco, Inc. shareholders $ 601,167 $ 418,945 $ 269,579
Basic earnings per share for Common and Class B common stock $ 15.46 $ 10.83 $ 7.03
Diluted Earnings per Share:      
Net income attributable to Watsco, Inc. shareholders $ 601,167 $ 418,945 $ 269,579
Diluted earnings per share for Common and Class B common stock $ 15.41 $ 10.78 $ 7.01
Class B Common Stock      
Basic Earnings per Share:      
Earnings allocated to Watsco, Inc. shareholders - Basic $ 50,010 $ 27,799 $ 18,078
Common Stock      
Basic Earnings per Share:      
Earnings allocated to Watsco, Inc. shareholders - Basic 499,792 353,873 228,361
Common Stock | Class B Common Stock      
Basic Earnings per Share:      
Net income attributable to Watsco, Inc. shareholders 601,167 418,945 269,579
Less: distributed and undistributed earnings allocated to restricted common stock 51,365 37,273 23,140
Earnings allocated to Watsco, Inc. shareholders - Basic $ 549,802 $ 381,672 $ 246,439
Weighted-average common shares outstanding - Basic 35,564,203 35,244,230 35,069,516
Basic earnings per share for Common and Class B common stock $ 15.46 $ 10.83 $ 7.03
Diluted Earnings per Share:      
Net income attributable to Watsco, Inc. shareholders $ 601,167 $ 418,945 $ 269,579
Less: distributed and undistributed earnings allocated to restricted common stock – Diluted 51,294 37,222 23,140
Earnings allocated to Watsco, Inc. shareholders - Diluted $ 549,873 $ 381,723 $ 246,439
Weighted-average common shares outstanding - Basic 35,564,203 35,244,230 35,069,516
Effect of dilutive stock options 119,431 179,608 81,055
Weighted-average common shares outstanding - Diluted 35,683,634 35,423,838 35,150,571
Diluted earnings per share for Common and Class B common stock $ 15.41 $ 10.78 $ 7.01