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Reconciliation of Effective Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
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	2.10%	2.30%	3.00%
Excess tax benefits from share-based compensation	(1.00%)
Tax effects on foreign income	(0.10%)	(0.30%)	(1.00%)
Effective income tax rate attributable to Watsco, Inc.	36.00%	37.00%	37.00%
Taxes attributable to non-controlling interest	(5.00%)	(5.40%)	(6.40%)
Effective income tax rate	31.00%	31.60%	30.60%

X

- Definition

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

+ References

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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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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 equity-based compensation costs.

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