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Schedule of Basic and Diluted Earnings per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net income attributable to Watsco, Inc. shareholders $ 34,219 $ 26,181
Less: distributed and undistributed earnings allocated to non-vested restricted common stock 3,775 3,120
Earnings allocated to Watsco, Inc. shareholders-Basic $ 30,444 $ 23,061
Weighted-average common shares outstanding - Basic 34,254,331 32,642,612
Basic earnings per share for Common and Class B common stock $ 0.89 $ 0.71
Net income attributable to Watsco, Inc. shareholders $ 34,219 $ 26,181
Less: distributed and undistributed earnings allocated to non-vested restricted common stock 3,775 3,120
Earnings allocated to Watsco, Inc. shareholders-Diluted $ 30,444 $ 23,061
Weighted-average common shares outstanding - Basic 34,254,331 32,642,612
Effect of dilutive stock options 65,779 37,194
Weighted-average common shares outstanding - Diluted 34,320,110 32,679,806
Diluted earnings per share for Common and Class B common stock $ 0.89 $ 0.71
Common Stock    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Earnings allocated to Watsco, Inc. shareholders-Basic $ 28,134 $ 21,147
Class B Common Stock    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Earnings allocated to Watsco, Inc. shareholders-Basic $ 2,310 $ 1,914