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Reconciliation between Federal Statutory Rate and Effective Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Federal statutory rate | 21.00% | 35.00% | 35.00%
State taxes, net of federal income tax benefit | 2.60% | 2.20% | 2.40%
Tax effects of foreign operations | (0.50%) | (1.20%) | (0.80%)
Tax benefit from settlement of employee equity awards | (0.10%) | (1.90%) | (0.00%)
Enactment of the TCJA-17 | (0.60%) | (1.70%) | (0.00%)
Other items | 0.90% | 0.20% | 0.20%
Impact of income attributable to noncontrolling interests | (0.40%) | (0.60%) | (1.40%)
Effective tax rate | 22.90% | 32.00% | 35.40%

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