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Reconciliation of Effective Income Tax Rate (Detail) | 12 Months Ended
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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%

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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