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Selected Quarterly Financial Data (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
Quarterly Financial Data [Line Items]                      
Revenues $ 913,611 [1] $ 1,241,232 [1] $ 1,214,435 [1] $ 851,424 [1] $ 903,816 [1] $ 1,177,012 [1] $ 1,223,439 [1] $ 808,972 [1] $ 4,220,702 [1] $ 4,113,239 [1] $ 3,944,540
Gross profit 228,072 302,204 291,861 212,447 222,041 285,846 295,245 204,225 1,034,584 1,007,357 956,402
Net income attributable to Watsco, Inc. $ 29,553 $ 63,099 $ 64,621 $ 25,537 $ 26,490 $ 57,968 $ 65,423 $ 23,048 $ 182,810 $ 172,929 $ 151,387
Earnings per share for Common and Class B common stock:                      
Basic $ 0.81 [2] $ 1.78 [2] $ 1.82 [2] $ 0.71 [2] $ 0.75 [2] $ 1.64 [2] $ 1.86 [2] $ 0.65 [2] $ 5.16 [2] $ 4.91 [2] $ 4.33
Diluted $ 0.81 [2] $ 1.78 [2] $ 1.82 [2] $ 0.71 [2] $ 0.75 [2] $ 1.64 [2] $ 1.85 [2] $ 0.65 [2] $ 5.15 [2] $ 4.90 [2] $ 4.32
[1] Sales of residential central air conditioners, heating equipment and parts and supplies are seasonal. Demand related to the residential central air conditioning replacement market is typically highest in the second and third quarters, and demand for heating equipment is usually highest in the fourth quarter. Demand related to the new construction sectors throughout most of the markets is fairly even during the year except for dependence on housing completions and related weather and economic conditions.
[2] 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.