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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, 2017
Mar. 31, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Net income attributable to Watsco, Inc. shareholders $ 26,181 $ 25,537
Less: distributed and undistributed earnings allocated to non-vested restricted common stock 3,120 2,413
Earnings allocated to Watsco, Inc. shareholders - Basic $ 23,061 $ 23,124
Weighted-average common shares outstanding - Basic 32,642,612 32,511,806
Basic earnings per share for Common and Class B common stock $ 0.71 $ 0.71
Net income attributable to Watsco, Inc. shareholders $ 26,181 $ 25,537
Less: distributed and undistributed earnings allocated to non-vested restricted common stock 3,120 2,413
Earnings allocated to Watsco, Inc. shareholders - Diluted $ 23,061 $ 23,124
Weighted-average common shares outstanding - Basic 32,642,612 32,511,806
Effect of dilutive stock options 37,194 25,419
Weighted-average common shares outstanding - Diluted 32,679,806 32,537,225
Diluted earnings per share for Common and Class B common stock $ 0.71 $ 0.71
Common Stock    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Earnings allocated to Watsco, Inc. shareholders - Basic $ 21,147 $ 21,205
Class B Common Stock    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Earnings allocated to Watsco, Inc. shareholders - Basic $ 1,914 $ 1,919