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v3.25.0.1

Reconciliation of Effective Income Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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 | 3.60% | 3.50% | 4.60%
Excess tax benefits from share-based compensation | (1.80%) | (1.80%) | (8.60%)
Tax effects on foreign income | 1.00% | 0.20% | 0.30%
FDII | (0.10%) | (0.10%) | (0.10%)
Change in valuation allowance | 0.20% | 0.30% | 0.40%
Tax credits and other | (0.40%) | (0.80%) | (0.40%)
Effective income tax rate attributable to Watsco, Inc. | 23.50% | 22.30% | 17.20%
Taxes attributable to non-controlling interest | (2.70%) | (2.60%) | (2.00%)
Effective income tax rate | 20.80% | 19.70% | 15.20%

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