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Schedule of Basic and Diluted Earnings per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Net income attributable to Watsco, Inc. shareholders $ 37,278 $ 83,480 $ 90,155 $ 35,037 $ 39,593 $ 79,163 $ 89,957 $ 34,219 $ 245,950 $ 242,932 $ 208,221
Less: distributed and undistributed earnings allocated to non-vested restricted common stock - Basic                 20,412 19,792 17,430
Earnings allocated to Watsco, Inc. shareholders - Basic                 $ 225,538 $ 223,140 $ 190,791
Weighted-average common shares outstanding - Basic                 34,644,700 34,319,890 32,824,947
Basic earnings per share for Common and Class B common stock $ 0.92 [1] $ 2.20 [1] $ 2.40 [1] $ 0.88 [1] $ 1.02 [1] $ 2.12 [1] $ 2.41 [1] $ 0.89 [1] $ 6.51 [1] $ 6.50 [1] $ 5.81
Net income attributable to Watsco, Inc. shareholders $ 37,278 $ 83,480 $ 90,155 $ 35,037 $ 39,593 $ 79,163 $ 89,957 $ 34,219 $ 245,950 $ 242,932 $ 208,221
Less: distributed and undistributed earnings allocated to non-vested restricted common stock - Diluted                 20,411 19,788 17,427
Earnings allocated to Watsco, Inc. shareholders - Diluted                 $ 225,539 $ 223,144 $ 190,794
Weighted-average common shares outstanding - Basic                 34,644,700 34,319,890 32,824,947
Effect of dilutive stock options                 30,941 54,379 37,686
Weighted-average common shares outstanding - Diluted                 34,675,641 34,374,269 32,862,633
Diluted earnings per share for Common and Class B common stock $ 0.92 [1] $ 2.20 [1] $ 2.40 [1] $ 0.88 [1] $ 1.02 [1] $ 2.11 [1] $ 2.40 [1] $ 0.89 [1] $ 6.50 [1] $ 6.49 [1] $ 5.81
Common Stock                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Earnings allocated to Watsco, Inc. shareholders - Basic                 $ 208,779 $ 206,355 $ 175,667
Class B Common Stock                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Earnings allocated to Watsco, Inc. shareholders - Basic                 $ 16,759 $ 16,785 $ 15,124
[1] Quarterly and year-to-date earnings per share are calculated on an individual basis; therefore, the sum of earnings per share amounts for the quarters may not equal earnings per share amounts for the year.