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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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income attributable to Watsco, Inc. shareholders $ 140,865 $ 106,489 $ 340,059 $ 223,569
Basic earnings per share for Common and Class B common stock $ 3.64 $ 2.77 $ 8.80 $ 5.83
Net income attributable to Watsco, Inc. shareholders $ 140,865 $ 106,489 $ 340,059 $ 223,569
Diluted earnings per share for Common and Class B common stock $ 3.62 $ 2.76 $ 8.75 $ 5.82
Class B Common Stock        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Earnings allocated to Watsco, Inc. shareholders – Basic $ 9,370 $ 7,146 $ 22,660 $ 15,027
Common Stock        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Earnings allocated to Watsco, Inc. shareholders – Basic 118,905 90,197 287,217 189,364
Common Stock | Class B Common Stock        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income attributable to Watsco, Inc. shareholders 140,865 106,489 340,059 223,569
Less: distributed and undistributed earnings allocated to non-vested restricted common stock 12,590 9,146 30,182 19,178
Earnings allocated to Watsco, Inc. shareholders – Basic $ 128,275 $ 97,343 $ 309,877 $ 204,391
Weighted-average common shares outstanding - Basic 35,260,126 35,099,871 35,222,865 35,046,156
Basic earnings per share for Common and Class B common stock $ 3.64 $ 2.77 $ 8.80 $ 5.83
Net income attributable to Watsco, Inc. shareholders $ 140,865 $ 106,489 $ 340,059 $ 223,569
Less: distributed and undistributed earnings allocated to non-vested restricted common stock – Diluted 12,563 9,135 30,132 19,175
Earnings allocated to Watsco, Inc. shareholders – Diluted $ 128,302 $ 97,354 $ 309,927 $ 204,394
Weighted-average common shares outstanding - Basic 35,260,126 35,099,871 35,222,865 35,046,156
Effect of dilutive stock options 181,852 137,151 177,389 62,887
Weighted-average common shares outstanding - Diluted 35,441,978 35,237,022 35,400,254 35,109,043
Diluted earnings per share for Common and Class B common stock $ 3.62 $ 2.76 $ 8.75 $ 5.82
Anti-dilutive stock options not included above 63,959 3,750 27,513 27,755