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Schedule of Basic and Diluted Earnings per Common Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Watsco, Inc. shareholders | $ 17,321 |  | $ 45,699 |  | $ 51,318 |  | $ 13,385 |  | $ 14,760 |  | $ 41,005 |  | $ 39,103 |  | $ 8,466 |  | $ 127,723 |  | $ 103,334 |  | $ 90,450
Less: distributed and undistributed earnings allocated to non-vested (restricted) common stock - basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,064 |  | 17,656 |  | 6,045
Earnings allocated to Watsco, Inc. shareholders - basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 118,659 |  | 85,678 |  | 84,405
Weighted-average common shares outstanding - Basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,195,598 |  | 31,680,187 |  | 30,678,206
Basic earnings per share for Common and Class B common stock | $ 0.50 | [1] | $ 1.32 | [1] | $ 1.48 | [1] | $ 0.39 | [1] | $ 0.04 | [1],[2] | $ 1.19 | [1] | $ 1.15 | [1] | $ 0.23 | [1] | $ 3.69 | [1] | $ 2.70 | [1],[2] | $ 2.75
Net income attributable to Watsco, Inc. shareholders | 17,321 |  | 45,699 |  | 51,318 |  | 13,385 |  | 14,760 |  | 41,005 |  | 39,103 |  | 8,466 |  | 127,723 |  | 103,334 |  | 90,450
Less: distributed and undistributed earnings allocated to non-vested (restricted) common stock - diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,053 |  | 17,656 |  | 6,042
Earnings allocated to Watsco, Inc. shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 118,670 |  | 85,678 |  | 84,408
Weighted-average common shares outstanding - Basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,195,598 |  | 31,680,187 |  | 30,678,206
Effect of dilutive stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 62,470 |  | 64,212 |  | 75,085
Weighted-average common shares outstanding - Diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,258,068 |  | 31,744,399 |  | 30,753,291
Diluted earnings per share for Common and Class B common stock | $ 0.50 | [1] | $ 1.32 | [1] | $ 1.48 | [1] | $ 0.39 | [1] | $ 0.04 | [1],[2] | $ 1.19 | [1] | $ 1.15 | [1] | $ 0.23 | [1] | $ 3.68 | [1] | $ 2.70 | [1],[2] | $ 2.74
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings allocated to Watsco, Inc. shareholders - basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 108,690 |  | 78,359 |  | 76,574
Class B Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings allocated to Watsco, Inc. shareholders - basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,969 |  | $ 7,319 |  | $ 7,831
[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.
[2] | On October 31, 2012, we paid a special dividend of $5.00 per share of Common and Class B common stock that resulted in a $0.37 per share and $0.33 per share reduction in diluted earnings per share for the quarter and year ended December 31, 2012, respectively.

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