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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income attributable to Watsco, Inc. shareholders $ 79,163 $ 65,029 $ 203,339 $ 164,966
Less: distributed and undistributed earnings allocated to non-vested restricted common stock - Basic 6,451 5,470 16,600 13,844
Earnings allocated to Watsco, Inc. shareholders - Basic $ 72,712 $ 59,559 $ 186,739 $ 151,122
Weighted-average common shares outstanding - Basic 34,339,859 32,712,151 34,301,672 32,679,334
Basic earnings per share for Common and Class B common stock $ 2.12 $ 1.82 $ 5.44 $ 4.62
Net income attributable to Watsco, Inc. shareholders $ 79,163 $ 65,029 $ 203,339 $ 164,966
Less: distributed and undistributed earnings allocated to non-vested restricted common stock - Diluted 6,448 5,468 16,593 13,840
Earnings allocated to Watsco, Inc. shareholders - Diluted $ 72,715 $ 59,561 $ 186,746 $ 151,126
Weighted-average common shares outstanding - Basic 34,339,859 32,712,151 34,301,672 32,679,334
Effect of dilutive stock options 59,530 34,215 64,850 32,516
Weighted-average common shares outstanding - Diluted 34,399,389 32,746,366 34,366,522 32,711,850
Diluted earnings per share for Common and Class B common stock $ 2.11 $ 1.82 $ 5.43 $ 4.62
Anti-dilutive stock options not included above 79,316 12,571 39,751 33,156
Common Stock        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Earnings allocated to Watsco, Inc. shareholders - Basic $ 67,201 $ 54,627 $ 172,571 $ 138,594
Class B Common Stock        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Earnings allocated to Watsco, Inc. shareholders - Basic $ 5,511 $ 4,932 $ 14,168 $ 12,528