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Schedule of Basic and Diluted Earnings per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net income attributable to Watsco, Inc. shareholders $ 418,945 $ 269,579 $ 245,950
Less: distributed and undistributed earnings allocated to non-vested restricted common stock 37,273 23,140 20,412
Earnings allocated to Watsco, Inc. shareholders - Basic $ 381,672 $ 246,439 $ 225,538
Weighted-average common shares outstanding—Basic 35,244,230 35,069,516 34,644,700
Basic earnings per share for Common and Class B common stock $ 10.83 $ 7.03 $ 6.51
Net income attributable to Watsco, Inc. shareholders $ 418,945 $ 269,579 $ 245,950
Less: distributed and undistributed earnings allocated to non-vested restricted common stock - Diluted 37,222 23,140 20,411
Earnings allocated to Watsco, Inc. shareholders - Diluted $ 381,723 $ 246,439 $ 225,539
Weighted-average common shares outstanding—Basic 35,244,230 35,069,516 34,644,700
Effect of dilutive stock options 179,608 81,055 30,941
Weighted-average common shares outstanding—Diluted 35,423,838 35,150,571 34,675,641
Diluted earnings per share for Common and Class B common stock $ 10.78 $ 7.01 $ 6.50
Common Stock      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Earnings allocated to Watsco, Inc. shareholders - Basic $ 353,873 $ 228,361 $ 208,779
Class B Common Stock      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Earnings allocated to Watsco, Inc. shareholders - Basic $ 27,799 $ 18,078 $ 16,759