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Reconciliation of Effective Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
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	2.40%	2.30%	2.40%
Excess tax benefits from share-based compensation	(2.70%)	(1.00%)
Tax effects on foreign income	(1.00%)	(0.10%)	(0.30%)
Tax credits and other	(0.60%)	(0.20%)	(0.10%)
Repatriation transition tax	3.00%
Deferred tax impact of enacted tax rate changes	(6.30%)
Effective income tax rate attributable to Watsco, Inc.	29.80%	36.00%	37.00%
Taxes attributable to non-controlling interest	(3.80%)	(5.00%)	(5.40%)
Effective income tax rate	26.00%	31.00%	31.60%

X

- Definition

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

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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 attributable to changes in the income tax rates.

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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 the repatriation of foreign earnings.

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