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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income attributable to Watsco, Inc. shareholders $ 65,029 $ 63,099 $ 164,966 $ 153,257
Less: distributed and undistributed earnings allocated to non-vested restricted common stock 5,470 5,081 13,844 12,388
Earnings allocated to Watsco, Inc. shareholders - Basic $ 59,559 $ 58,018 $ 151,122 $ 140,869
Weighted-average common shares outstanding - Basic 32,712,151 32,613,995 32,679,334 32,567,073
Basic earnings per share for Common and Class B common stock $ 1.82 $ 1.78 $ 4.62 $ 4.33
Net income attributable to Watsco, Inc. shareholders $ 65,029 $ 63,099 $ 164,966 $ 153,257
Less: distributed and undistributed earnings allocated to non-vested restricted common stock 5,468 5,078 13,840 12,383
Earnings allocated to Watsco, Inc. shareholders - Diluted $ 59,561 $ 58,021 $ 151,126 $ 140,874
Weighted-average common shares outstanding - Basic 32,712,151 32,613,995 32,679,334 32,567,073
Effect of dilutive stock options 34,215 36,158 32,516 34,042
Weighted-average common shares outstanding - Diluted 32,746,366 32,650,153 32,711,850 32,601,115
Diluted earnings per share for Common and Class B common stock $ 1.82 $ 1.78 $ 4.62 $ 4.32
Anti-dilutive stock options not included above 12,571 3,565 33,156 18,876
Common Stock        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Earnings allocated to Watsco, Inc. shareholders - Basic $ 54,627 $ 53,186 $ 138,594 $ 129,120
Class B Common Stock        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Earnings allocated to Watsco, Inc. shareholders - Basic $ 4,932 $ 4,832 $ 12,528 $ 11,749