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Schedule of Basic and Diluted Earnings per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income attributable to Watsco, Inc. shareholders $ 83,480 $ 79,163 $ 208,672 $ 203,339
Less: distributed and undistributed earnings allocated to non-vested restricted common stock - Basic 6,973 6,451 17,326 16,600
Earnings allocated to Watsco, Inc. shareholders - Basic $ 76,507 $ 72,712 $ 191,346 $ 186,739
Weighted-average common shares outstanding - Basic 34,755,627 34,339,859 34,544,425 34,301,672
Basic earnings per share for Common and Class B common stock $ 2.20 $ 2.12 $ 5.54 $ 5.44
Net income attributable to Watsco, Inc. shareholders $ 83,480 $ 79,163 $ 208,672 $ 203,339
Less: distributed and undistributed earnings allocated to non-vested restricted common stock - Diluted 6,971 6,448 17,325 16,593
Earnings allocated to Watsco, Inc. shareholders - Diluted $ 76,509 $ 72,715 $ 191,347 $ 186,746
Weighted-average common shares outstanding - Basic 34,755,627 34,339,859 34,544,425 34,301,672
Effect of dilutive stock options 33,328 59,530 25,294 64,850
Weighted-average common shares outstanding - Diluted 34,788,955 34,399,389 34,569,719 34,366,522
Diluted earnings per share for Common and Class B common stock $ 2.20 $ 2.11 $ 5.54 $ 5.43
Anti-dilutive stock options not included above 183,083 79,316 220,013 39,751
Common Stock        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Earnings allocated to Watsco, Inc. shareholders - Basic $ 70,836 $ 67,201 $ 177,075 $ 172,571
Class B Common Stock        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Earnings allocated to Watsco, Inc. shareholders - Basic $ 5,671 $ 5,511 $ 14,271 $ 14,168