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Selected Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Data [Line Items]                      
Revenues $ 1,072,315 [1] $ 1,394,915 [1] $ 1,371,854 [1] $ 931,278 [1] $ 991,326 [1] $ 1,296,007 [1] $ 1,332,743 [1] $ 926,577 [1] $ 4,770,362 [1] $ 4,546,653 [1],[2] $ 4,341,955
Gross profit 260,521 334,691 327,984 233,760 249,644 319,009 320,766 230,833 1,156,956 1,120,252 1,065,659
Net income attributable to Watsco, Inc. $ 37,278 $ 83,480 $ 90,155 $ 35,037 $ 39,593 $ 79,163 $ 89,957 $ 34,219 $ 245,950 $ 242,932 $ 208,221
Earnings per share for Common and Class B common stock:                      
Basic $ 0.92 [3] $ 2.20 [3] $ 2.40 [3] $ 0.88 [3] $ 1.02 [3] $ 2.12 [3] $ 2.41 [3] $ 0.89 [3] $ 6.51 [3] $ 6.50 [3] $ 5.81
Diluted $ 0.92 [3] $ 2.20 [3] $ 2.40 [3] $ 0.88 [3] $ 1.02 [3] $ 2.11 [3] $ 2.40 [3] $ 0.89 [3] $ 6.50 [3] $ 6.49 [3] $ 5.81
[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 evenly distributed throughout the year except for dependence on housing completions and related weather and economic conditions.
[2] Effective January 1, 2018, we adopted the provisions of accounting guidance related to revenue recognition. Amounts prior to January 1, 2018 have not been adjusted and remain as originally reported for such periods. See Note 3.
[3] 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.