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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Net income attributable to Watsco, Inc. shareholders $ 43,255 $ 65,029 $ 73,756 $ 26,181 $ 29,553 $ 63,099 $ 64,621 $ 25,537 $ 208,221 $ 182,810 $ 172,929
Less: distributed and undistributed earnings allocated to non-vested restricted common stock                 17,430 14,806 13,634
Earnings allocated to Watsco, Inc. shareholders-Basic                 $ 190,791 $ 168,004 $ 159,295
Weighted-average common shares outstanding-Basic                 32,824,947 32,582,385 32,435,961
Basic earnings per share for Common and Class B common stock $ 1.19 [1] $ 1.82 [1] $ 2.07 [1] $ 0.71 [1] $ 0.81 [1] $ 1.78 [1] $ 1.82 [1] $ 0.71 [1] $ 5.81 [1] $ 5.16 [1] $ 4.91
Net income attributable to Watsco, Inc. shareholders $ 43,255 $ 65,029 $ 73,756 $ 26,181 $ 29,553 $ 63,099 $ 64,621 $ 25,537 $ 208,221 $ 182,810 $ 172,929
Less: distributed and undistributed earnings allocated to non-vested restricted common stock                 17,427 14,801 13,626
Earnings allocated to Watsco, Inc. shareholders-Diluted                 $ 190,794 $ 168,009 $ 159,303
Weighted-average common shares outstanding-Basic                 32,824,947 32,582,385 32,435,961
Effect of dilutive stock options                 37,686 34,119 44,395
Weighted-average common shares outstanding-Diluted                 32,862,633 32,616,504 32,480,356
Diluted earnings per share for Common and Class B common stock $ 1.19 [1] $ 1.82 [1] $ 2.07 [1] $ 0.71 [1] $ 0.81 [1] $ 1.78 [1] $ 1.82 [1] $ 0.71 [1] $ 5.81 [1] $ 5.15 [1] $ 4.90
Common Stock                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Earnings allocated to Watsco, Inc. shareholders-Basic                 $ 175,667 $ 154,021 $ 146,037
Class B Common Stock                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Earnings allocated to Watsco, Inc. shareholders-Basic                 $ 15,124 $ 13,983 $ 13,258
[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.