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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Net income attributable to Watsco, Inc. shareholders $ 29,553 $ 63,099 $ 64,621 $ 25,537 $ 26,490 $ 57,968 $ 65,423 $ 23,048 $ 182,810 $ 172,929 $ 151,387
Less: distributed and undistributed earnings allocated to non-vested restricted common stock                 14,806 13,634 11,444
Earnings allocated to Watsco, Inc. shareholders - Basic                 $ 168,004 $ 159,295 $ 139,943
Weighted-average common shares outstanding - Basic                 32,582,385 32,435,961 32,308,073
Basic earnings per share for Common and Class B common stock $ 0.81 [1] $ 1.78 [1] $ 1.82 [1] $ 0.71 [1] $ 0.75 [1] $ 1.64 [1] $ 1.86 [1] $ 0.65 [1] $ 5.16 [1] $ 4.91 [1] $ 4.33
Net income attributable to Watsco, Inc. shareholders $ 29,553 $ 63,099 $ 64,621 $ 25,537 $ 26,490 $ 57,968 $ 65,423 $ 23,048 $ 182,810 $ 172,929 $ 151,387
Less: distributed and undistributed earnings allocated to non-vested restricted common stock                 14,801 13,626 11,435
Earnings allocated to Watsco, Inc. shareholders - Diluted                 $ 168,009 $ 159,303 $ 139,952
Weighted-average common shares outstanding - Basic                 32,582,385 32,435,961 32,308,073
Effect of dilutive stock options                 34,119 44,395 50,781
Weighted-average common shares outstanding - Diluted                 32,616,504 32,480,356 32,358,854
Diluted earnings per share for Common and Class B common stock $ 0.81 [1] $ 1.78 [1] $ 1.82 [1] $ 0.71 [1] $ 0.75 [1] $ 1.64 [1] $ 1.85 [1] $ 0.65 [1] $ 5.15 [1] $ 4.90 [1] $ 4.32
Common Stock                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Earnings allocated to Watsco, Inc. shareholders - Basic                 $ 154,021 $ 146,037 $ 128,214
Class B Common Stock                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Earnings allocated to Watsco, Inc. shareholders - Basic                 $ 13,983 $ 13,258 $ 11,729
[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.