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Unaudited Pro Forma Financial Information from Joint Venture (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Business Acquisition, Pro Forma Information [Line Items] |  |
Revenues | $ 3,526,621 | $ 3,404,381
Net income | 156,728 | 159,147
Less: net income attributable to noncontrolling interest | 54,153 | 60,380
Net income attributable to Watsco, Inc. | $ 102,575 | $ 98,767
Diluted earnings per share for Common and Class B common stock | $ 2.64 | $ 2.89

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