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Reconciliation of Effective Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of Effective Income Tax Rate [Line Items]
U.S. federal statutory rate	35.00%	35.00%	35.00%
State income taxes, net of federal benefit and other	2.30%	3.00%	3.30%
Tax effects on foreign income	(0.30%)	(1.00%)	(1.30%)
Effective income tax rate attributable to Watsco, Inc.	37.00%	37.00%	37.00%
Taxes attributable to noncontrolling interest	(5.40%)	(6.40%)	(7.70%)
Effective income tax rate	31.60%	30.60%	29.30%

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to noncontrolling interest income (loss) exempt from income taxes.

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