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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Basic Earnings per Share:      
Net income attributable to Watsco, Inc. shareholders $ 536,337 $ 601,167 $ 418,945
Basic earnings per share for Common and Class B common stock $ 13.72 $ 15.46 $ 10.83
Diluted Earnings per Share:      
Net income attributable to Watsco, Inc. shareholders $ 536,337 $ 601,167 $ 418,945
Diluted earnings per share for Common and Class B common stock $ 13.67 $ 15.41 $ 10.78
Class B Common Stock [Member]      
Basic Earnings per Share:      
Earnings allocated to Watsco, Inc. shareholders - Basic $ 44,185 $ 50,010 $ 27,799
Common Stock [Member]      
Basic Earnings per Share:      
Earnings allocated to Watsco, Inc. shareholders - Basic 455,186 499,792 353,873
Common Stock [Member] | Class B Common Stock [Member]      
Basic Earnings per Share:      
Net income attributable to Watsco, Inc. shareholders 536,337 601,167 418,945
Less: distributed and undistributed earnings allocated to restricted common stock 36,966 51,365 37,273
Earnings allocated to Watsco, Inc. shareholders - Basic $ 499,371 $ 549,802 $ 381,672
Weighted-average common shares outstanding—Basic 36,406,148 35,564,203 35,244,230
Basic earnings per share for Common and Class B common stock $ 13.72 $ 15.46 $ 10.83
Diluted Earnings per Share:      
Net income attributable to Watsco, Inc. shareholders $ 536,337 $ 601,167 $ 418,945
Less: distributed and undistributed earnings allocated to restricted common stock 36,932 51,294 37,222
Earnings allocated to Watsco, Inc. shareholders - Diluted $ 499,405 $ 549,873 $ 381,723
Weighted-average common shares outstanding—Basic 36,406,148 35,564,203 35,244,230
Effect of dilutive stock options 125,535 119,431 179,608
Weighted-average common shares outstanding—Diluted 36,531,683 35,683,634 35,423,838
Diluted earnings per share for Common and Class B common stock $ 13.67 $ 15.41 $ 10.78