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Selected Quarterly Financial Data (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
Quarterly Financial Data [Line Items]                      
Revenues $ 903,816 [1] $ 1,177,012 [1] $ 1,223,439 [1] $ 808,972 [1] $ 876,787 [1] $ 1,134,999 [1] $ 1,170,186 [1] $ 762,568 [1] $ 4,113,239 [1] $ 3,944,540 [1] $ 3,743,330
Gross profit 222,041 285,846 295,245 204,225 214,295 274,765 279,273 188,069 1,007,357 956,402 899,253
Net income attributable to Watsco, Inc. $ 26,490 $ 57,968 $ 65,423 $ 23,048 $ 24,072 $ 54,461 $ 56,101 $ 16,753 $ 172,929 $ 151,387 $ 127,723
Earnings per share for Common and Class B common stock:                      
Basic $ 0.75 [2] $ 1.64 [2] $ 1.86 [2] $ 0.65 [2] $ 0.69 [2] $ 1.56 [2] $ 1.60 [2] $ 0.48 [2] $ 4.91 [2] $ 4.33 [2] $ 3.69
Diluted $ 0.75 [2] $ 1.64 [2] $ 1.85 [2] $ 0.65 [2] $ 0.69 [2] $ 1.56 [2] $ 1.60 [2] $ 0.48 [2] $ 4.90 [2] $ 4.32 [2] $ 3.68
[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.