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Schedule of Basic and Diluted Earnings per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income attributable to Watsco, Inc. shareholders $ 65,423 $ 56,101 $ 88,471 $ 72,854
Less: distributed and undistributed earnings allocated to non-vested restricted common stock 5,183 4,286 6,922 5,532
Earnings allocated to Watsco, Inc. shareholders - Basic $ 60,240 $ 51,815 $ 81,549 $ 67,322
Weighted-average common shares outstanding - Basic 32,427,088 32,295,912 32,402,262 32,273,077
Basic earnings per share for Common and Class B common stock $ 1.86 $ 1.60 $ 2.52 $ 2.09
Net income attributable to Watsco, Inc. shareholders $ 65,423 $ 56,101 $ 88,471 $ 72,854
Less: distributed and undistributed earnings allocated to non-vested restricted common stock 5,179 4,281 6,917 5,526
Earnings allocated to Watsco, Inc. shareholders - Diluted $ 60,244 $ 51,820 $ 81,554 $ 67,328
Weighted-average common shares outstanding - Basic 32,427,088 32,295,912 32,402,262 32,273,077
Effect of dilutive stock options 50,174 57,133 52,036 56,299
Weighted-average common shares outstanding - Diluted 32,477,262 32,353,045 32,454,298 32,329,376
Diluted earnings per share for Common and Class B common stock $ 1.85 $ 1.60 $ 2.51 $ 2.08
Anti-dilutive stock options not included above 2,363   54,535 2,873
Common Stock        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Earnings allocated to Watsco, Inc. shareholders - Basic $ 55,179 $ 47,467 $ 74,692 $ 61,668
Class B Common Stock        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Earnings allocated to Watsco, Inc. shareholders - Basic $ 5,061 $ 4,348 $ 6,857 $ 5,654