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Schedule of Effective Income Tax Rate Reconciliation (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Income tax expense at federal statutory rate | 35.00% | 35.00% | 35.00%
State taxes, net of federal tax effect | 2.50% | 1.60% | 1.70%
Foreign earnings taxed at different rates | (24.20%) | (15.50%) | (14.00%)
Withholding tax | 1.90% | 1.40% | 1.10%
Foreign tax credit | (1.10%) | (1.00%) | (0.30%)
Other international components | 0.00% | (0.10%) | 0.80%
Change in valuation allowance | 0.20% | (0.80%) | (0.10%)
Deferred tax adjustments and rate changes | 5.20% | 0.10% | (0.10%)
Deemed repatriation transition tax | 55.50% | 0.00% | 0.00%
Subpart F income | 1.50% | 0.60% | 0.50%
Research and development tax credit | (1.10%) | (0.80%) | (0.60%)
Section 199 Deduction | (1.40%) | (1.80%) | (1.50%)
Other permanent differences | 1.70% | 0.90% | 0.70%
Total | 75.70% | 19.60% | 23.20%

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