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Schedule of Basic and Diluted Earnings per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income attributable to Watsco, Inc. shareholders $ 90,155 $ 89,957 $ 125,192 $ 124,176
Less: distributed and undistributed earnings allocated to non-vested restricted common stock - Basic 7,512 7,379 10,355 10,147
Earnings allocated to Watsco, Inc. shareholders - Basic $ 82,643 $ 82,578 $ 114,837 $ 114,029
Weighted-average common shares outstanding - Basic 34,435,099 34,309,885 34,411,738 34,282,261
Basic earnings per share for Common and Class B common stock $ 2.40 $ 2.41 $ 3.34 $ 3.33
Net income attributable to Watsco, Inc. shareholders $ 90,155 $ 89,957 $ 125,192 $ 124,176
Less: distributed and undistributed earnings allocated to non-vested restricted common stock - Diluted 7,511 7,374 10,354 10,144
Earnings allocated to Watsco, Inc. shareholders - Diluted $ 82,644 $ 82,583 $ 114,838 $ 114,032
Weighted-average common shares outstanding - Basic 34,435,099 34,309,885 34,411,738 34,282,261
Effect of dilutive stock options 27,861 69,310 21,210 67,554
Weighted-average common shares outstanding - Diluted 34,462,960 34,379,195 34,432,948 34,349,815
Diluted earnings per share for Common and Class B common stock $ 2.40 $ 2.40 $ 3.34 $ 3.32
Anti-dilutive stock options not included above 174,457 40,797 213,270 24,044
Common Stock        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Earnings allocated to Watsco, Inc. shareholders - Basic $ 76,456 $ 76,321 $ 106,234 $ 105,383
Class B Common Stock        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Earnings allocated to Watsco, Inc. shareholders - Basic $ 6,187 $ 6,257 $ 8,603 $ 8,646