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Reconciliation of Effective Income Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Reconciliation of Effective Income Tax Rate [Line Items] |  |  |
U.S. federal statutory rate | 21.00% | 21.00% | 21.00%
State income taxes, net of federal benefit and other | 3.50% | 3.30% | 2.80%
Excess tax benefits from share-based compensation | (1.70%) | (2.10%) | (1.80%)
Tax effects on foreign income | 0.40% | 0.30% | 0.50%
GILTI | 0.00% | 0.00% | (0.10%)
FDII | (0.10%) | 0.00% | 0.00%
Change in valuation allowance | 0.80% | 0.00% | 0.00%
Tax credits and other | (0.50%) | (0.50%) | (1.20%)
Effective income tax rate attributable to Watsco, Inc. | 23.40% | 22.00% | 21.20%
Taxes attributable to non-controlling interest | (2.90%) | (2.80%) | (2.70%)
Effective income tax rate | 20.50% | 19.20% | 18.50%

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