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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, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Watsco, Inc. shareholders | $ 46,010 |  | $ 106,489 |  | $ 86,578 |  | $ 30,502 |  | $ 37,278 |  | $ 83,480 |  | $ 90,155 |  | $ 35,037 |  | $ 269,579 |  | $ 245,950 |  | $ 242,932
Less: distributed and undistributed earnings allocated to non-vested restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,140 |  | 20,412 |  | 19,792
Earnings allocated to Watsco, Inc. shareholders - Basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 246,439 |  | $ 225,538 |  | $ 223,140
Weighted-average common shares outstanding - Basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,069,516 |  | 34,644,700 |  | 34,319,890
Basic earnings per share for Common and Class B common stock | $ 1.14 | [1] | $ 2.77 | [1] | $ 2.26 | [1] | $ 0.72 | [1] | $ 0.92 | [1] | $ 2.20 | [1] | $ 2.40 | [1] | $ 0.88 | [1] | $ 7.03 | [1] | $ 6.51 | [1] | $ 6.50
Net income attributable to Watsco, Inc. shareholders | $ 46,010 |  | $ 106,489 |  | $ 86,578 |  | $ 30,502 |  | $ 37,278 |  | $ 83,480 |  | $ 90,155 |  | $ 35,037 |  | $ 269,579 |  | $ 245,950 |  | $ 242,932
Less: distributed and undistributed earnings allocated to non-vested restricted common stock - Diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,140 |  | 20,411 |  | 19,788
Earnings allocated to Watsco, Inc. shareholders - Diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 246,439 |  | $ 225,539 |  | $ 223,144
Weighted-average common shares outstanding - Basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,069,516 |  | 34,644,700 |  | 34,319,890
Effect of dilutive stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 81,055 |  | 30,941 |  | 54,379
Weighted-average common shares outstanding - Diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,150,571 |  | 34,675,641 |  | 34,374,269
Diluted earnings per share for Common and Class B common stock | $ 1.14 | [1] | $ 2.76 | [1] | $ 2.26 | [1] | $ 0.72 | [1] | $ 0.92 | [1] | $ 2.20 | [1] | $ 2.40 | [1] | $ 0.88 | [1] | $ 7.01 | [1] | $ 6.50 | [1] | $ 6.49
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings allocated to Watsco, Inc. shareholders - Basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 228,361 |  | $ 208,779 |  | $ 206,355
Class B Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings allocated to Watsco, Inc. shareholders - Basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,078 |  | $ 16,759 |  | $ 16,785
[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.

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- Definition Amount of earnings (loss) distributed and earnings (loss) allocated to participating securities for the diluted earnings (loss) per share or per unit calculation under the two-class method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121326447&loc=SL5780133-109256 + Details
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- Definition The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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