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Acquisitions (Schedule Of Unaudited Pro Forma Financial Information From Joint Venture) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Acquisitions [Abstract] |  |  |
Revenues | $ 3,073,926 | $ 3,131,069 | $ 2,562,319
Net income | 138,818 | 118,194 | 59,874
Less: net income attributable to noncontrolling interest | 48,179 | 35,660 | 13,332
Net income attributable to Watsco, Inc. | $ 90,639 | $ 82,534 | $ 46,542
Diluted earnings per share for Common and Class B common stock | $ 2.75 | $ 2.54 | $ 1.44

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