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Reconciliation of Effective Income Tax Rate (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of Effective Income Tax Rate [Line Items] |  |  |
U.S. federal statutory rate | 21.00% | 21.00% | 35.00%
State income taxes, net of federal benefit and other | 2.80% | 3.60% | 2.40%
Excess tax benefits from share-based compensation | (2.00%) | (2.00%) | (2.70%)
Tax effects on foreign income | 0.50% | 0.50% | (1.00%)
GILTI | (0.10%) | 0.30% |
Tax credits and other | (1.00%) |  | (0.60%)
Repatriation transition tax |  | (0.90%) | 3.00%
Deferred tax impact of enacted tax rate changes |  | 0.30% | (6.30%)
Effective income tax rate attributable to Watsco, Inc. | 21.20% | 22.80% | 29.80%
Taxes attributable to non-controlling interest | (2.70%) | (3.10%) | (3.80%)
Effective income tax rate | 18.50% | 19.70% | 26.00%

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