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Comprehensive Income (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Comprehensive Income [Abstract]
Net income	$ 51,818	$ 43,518	$ 115,212	$ 97,200
Changes in unrealized losses on derivative instrument	77	52	221	120
Changes in unrealized losses on available-for-sale securities	(23)	17	(20)	13
Comprehensive income	51,872	43,587	115,413	97,333
Less: comprehensive income attributable to noncontrolling interest	18,271	12,081	38,142	26,885
Comprehensive income attributable to Watsco, Inc.	$ 33,601	$ 31,506	$ 77,271	$ 70,448

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- Definition

The change in unrealized holding gain (loss), net of tax, on available-for-sale securities included in a separate component of shareholders' equity during the period.

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Change in accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges, net of tax effect. The after tax effect change includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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