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Reconciliation of Effective Income Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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 | 4.60% | 3.50% | 3.30%
Excess tax benefits from share-based compensation | (8.60%) | (1.70%) | (2.10%)
Tax effects on foreign income | 0.30% | 0.40% | 0.30%
FDII | (0.10%) | (0.10%) | 0.00%
Change in valuation allowance | 0.40% | 0.80% | 0.00%
Tax credits and other | (0.40%) | (0.50%) | (0.50%)
Effective income tax rate attributable to Watsco, Inc. | 17.20% | 23.40% | 22.00%
Taxes attributable to non-controlling interest | (2.00%) | (2.90%) | (2.80%)
Effective income tax rate | 15.20% | 20.50% | 19.20%

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- Definition 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 valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI https://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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