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Reconciliation of Effective Income Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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 | 3.30% | 2.50% | 3.10%
Tax effects on foreign income | (1.30%) | (0.80%) | (0.10%)
Effective income tax rate attributable to Watsco, Inc. | 37.00% | 36.70% | 38.00%
Taxes attributable to noncontrolling interest | (7.70%) | (8.30%) | (8.80%)
Effective income tax rate | 29.30% | 28.40% | 29.20%

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