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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Net income attributable to Watsco, Inc. shareholders $ 26,490 $ 57,968 $ 65,423 $ 23,048 $ 24,072 $ 54,461 $ 56,101 $ 16,753 $ 172,929 $ 151,387 $ 127,723
Less: distributed and undistributed earnings allocated to non-vested restricted common stock                 13,634 11,444 9,064
Earnings allocated to Watsco, Inc. shareholders - Basic                 $ 159,295 $ 139,943 $ 118,659
Weighted-average common shares outstanding - Basic                 32,435,961 32,308,073 32,195,598
Basic earnings per share for Common and Class B common stock $ 0.75 [1] $ 1.64 [1] $ 1.86 [1] $ 0.65 [1] $ 0.69 [1] $ 1.56 [1] $ 1.60 [1] $ 0.48 [1] $ 4.91 [1] $ 4.33 [1] $ 3.69
Net income attributable to Watsco, Inc. shareholders $ 26,490 $ 57,968 $ 65,423 $ 23,048 $ 24,072 $ 54,461 $ 56,101 $ 16,753 $ 172,929 $ 151,387 $ 127,723
Less: distributed and undistributed earnings allocated to non-vested restricted common stock                 13,626 11,435 9,053
Earnings allocated to Watsco, Inc. shareholders - Diluted                 $ 159,303 $ 139,952 $ 118,670
Weighted-average common shares outstanding - Basic                 32,435,961 32,308,073 32,195,598
Effect of dilutive stock options                 44,395 50,781 62,470
Weighted-average common shares outstanding - Diluted                 32,480,356 32,358,854 32,258,068
Diluted earnings per share for Common and Class B common stock $ 0.75 [1] $ 1.64 [1] $ 1.85 [1] $ 0.65 [1] $ 0.69 [1] $ 1.56 [1] $ 1.60 [1] $ 0.48 [1] $ 4.90 [1] $ 4.32 [1] $ 3.68
Common Stock                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Earnings allocated to Watsco, Inc. shareholders - Basic                 $ 146,037 $ 128,214 $ 108,690
Class B Common Stock                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Earnings allocated to Watsco, Inc. shareholders - Basic                 $ 13,258 $ 11,729 $ 9,969
[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.